09 maio 2020

How To Track Iphone Without Them Knowing

Few feelings are as stomach-sinkingly awful as the thought of losing an expensive new iPhone. Whether you left it on the bus or someone slid it out of your back pocket, we put so much store in our phones that their loss leaves is saddened and angered. Most of us keep at least copies of everything in our lives on our phones, from personal conversations to emails, 

To say nothing of all our personal information and social media accounts. Of course there are security measures in place, but nobody wants to risk having all that information fall into the hands of the wrong people. In this article, I will show you how to find a phone that has been lost, whether your own phone or the phone of a friend or family member.

Can you track an iPhone without them knowing?

First off, hopefully you activated the Find My Phone feature of your iPhone when you still had it in your possession. Secondly, if your phone doesn't have service (and thus a connection to the Internet) or if you don't have iCloud set up, then these solutions are not going to work for you. Unfortunately phone technology is advanced but it isn't magical; if your phone isn't talking to the network or if you haven't turned on Find My Phone, then unfortunately the technological solution is probably not going to work. (Seriously. If you have possession of your phone(s) then stop reading this article, pick up your devices, go to Settings and select "Find My Phone" (iPhone) or "Find My Device" (Android) and make sure they are toggled on. TTjem upi cam dp ot/"

Without further ado, let's find your phone!

Can I Tell if Someone is Tracking my iPhone?



Usually yes, if someone is using the "Find my Phone" feature, it will be displaying things on the iPhone screen. Thankfully, "Find My iPhone" comes pre-loaded on all phones with iOs 9 or newer. "Find my iPhone" is the gold standard when it comes to locating your lost iPhone. The service is integrated as part of iCloud. Here's how to use it to find your missing iPhone then track down your phone's exact location.

Step 1: Open up the "Find My iPhone" on a different device

It doesn't matter if you decide to use your iPad, your laptop, or a friend's iPhone – you can run the Find My Phone app fr0m Mac. You can use the Find my Phone app.

If you are using an Apple product like another phone or an iPad, you can simply click on the app.

If you are using a computer (even a Windows PC will work), go to icloud.com then click on the "Find iPhone" icon. Once you've clicked on the "Find iPhone" icon the website process and "Find my iPhone" app process are the same.

Step 2: Input Your Apple ID Credentials (they are the same as your iCloud info)

Since you are not using your phone, you won't be automatically logged in.

Once you log in to the app, select the "All Devices" drop-down option and then find the device that you want to locate.

Step 3: Once You Select Your Phone, Options Will Appear

As soon as you select your device on the page, iCloud will begin to search for it. If the search is successful, you will see your device on a map, pinpointing it's location. Before you sprint out the door to get it, there are some other options you should take a look at.

Once you select your device you will have three additional options in addition to seeing your phone's location. These options are playing a sound, activating "Lost Mode" and erase the phone.

Playing the sound is a great way to find your phone if you lost it somewhere around your house. If you click the option, an audio alert will go off on your phone which will hopefully help you find it. The alert will sound like a loud pinging noise alerting you that your phone is at home with you and not at the coffee shop you just visited. If you hear the pinging sound then you'll quickly find your phone by just following the sound.

When enabled, Lost Mode will lock your phone with a passcode and will display a message of your choice. This can either ensure it will be safe until you can find it, or will alert the thief what you expect of them and that you know where they are. This mode can also enable location services on your phone too.

However, if things have gone too far and you think there is a very slim chance you will ever get your device back – perhaps your phone has already crossed an international border – the best course of action is to simply erase it. Yes, this is giving up, but it also prevents your personal information getting into the hands of someone who could abuse it.

If you follow these steps, you should have your phone back in your pocket in no time. 

Is there an app to track someones phone without them knowing?


What if you're looking for someone else's phone? I'm sorry to burst your bubble, but you are not allowed to track someone else's phone without their knowledge. While there are supposedly apps that you can install on a target's phone to track it and keep tabs on what they are doing on it, that is completely illegal and immoral. In addition to the moral issue, there is the practical fact that they could find the app which could lead to a very awkward situation, possibly one involving the police.

However, there are times when you want to find a friend's phone and you have a legitimate reason, and (the important part) they have given you permission to find it. Just as when you were looking for your own phone, there is an app that can help you find the phones of your friends and family with ease. The "Find My Friends" app used to be an extra download, but now it comes with iOS, so if your friends have ever updated their phone, they should have it.

"Find My Friends" is an app that basically allows you to share your location with others and vice versa. It can be great for keeping track of where your kids are, knowing what your significant other is doing, or just keeping tabs on your friends. It can also help them find a lost phone (as long as you have "Shared Locations" with them). Here is how to set it up:

Step 1: Open the app on your phone and the phone of the person you want to be able to share locations with.

Step 2: Click your profile in the bottom left of the screen.

Step 3: Enable "Share My Location" and make sure AirDrop is enabled on your own phone.

Step 4: From there, your friends and family will be able to search/add you to share your location with them and vice versa. You each will need to accept the "Shared Location" request from the other. Now, you can just click on their profile in the app and keep track of them.

As you likely realized while reading this article, it is a much better idea to be proactive than reactive when it comes to tracking phones. If you set up "Find My iPhone" and "Find My Friends" before your phone gets stolen or lost, it will save you a lot of potential hassle down the road. While it may be a bit worrisome to have someone be able to see your location at all times, it can really save you once your phone goes missing and you need to track it down. It is obviously best to pick someone who you trust not to take advantage of the information an app like "Find My Friends" can provide them.

No one deserves to have their phone stolen or go missing, but thankfully, there are some ways to find it, or at least have the information deleted. Hopefully, this guide helped you be able to find your phone or the phone of your friends and family, or at least prepared you for when it may happen.

If you have other ways of finding a lost phone, please share them with us below!


More information

Collection Of Pcap Files From Malware Analysis

Update: Feb 19. 2015

We have been adding pcaps to the collection so remember to check out the folder ( Pcap collection) for the recent pcaps.

I had a project to test some malicious and exploit pcaps and collected a lot of them (almost 1000) from various public sources. You can see them in the PUBLIC folder. The credits go to the authors of the pcaps listed in the name of each file. Please visit their blogs and sites to see more information about the pcaps, see their recent posts, and send them thanks. The public pcaps have no passwords on them.

Update:Dec 13. 2014 

Despite rare updates of this post, we have been adding pcaps to the collection so remember to check out the folder ( Pcap collection (New link)) for the recent pcaps!

Update:Dec 31. 2013 - added new pcaps

I did some spring cleaning yesterday and came up with these malware and exploit pcaps. Such pcaps are very useful for IDS and signature testing and development, general education, and malware identification. While there are some online public sandboxes offering pcaps for download like Cuckoo or Anubis but  looking for them is a tedious task and you cannot be totally sure the pcap is for the malware family supposedly analysed - in other words, if the sandbox says it is Zeus does not necessarily mean that it is.

I found some good pcap repositories here (http://www.netresec.com/?page=PcapFiles) but there are very few pcaps from malware.

These are from identified and verified (to the best of my knowledge and belief - email me if you find errors) malware samples.

All of them show the first stage with the initial callback and most have the DNS requests as well. A few pcaps show extended malware runs (e.g. purplehaze pcap is over 500mb).
Most pcaps are mine, a few are from online sandboxes, and one is borrowed from malware.dontneedcoffee.com. That said, I can probably find the corresponding samples for all that have MD5 listed if you really need them. Search contagio, some are posted with the samples.

Each file has the following naming convention:
BIN [RTF, PDF] - the filetype of the dropper used, malware family name, MD5, and year+month of the malware analysis.

I will be adding more pcaps in the future. Please donate your pcaps from identified samples, I am sure many of you have.

Thank you


Download all together or separately.

All pcaps archives have the same password (same scheme), email me if you need it. I tried posting it without any passwords and pass infected but they get flagged as malware. Modern AV rips though zips and zips with the pass 'infected' with ease.


  1. 2012-12-31 BIN_Xinmic_8761F29AF1AE2D6FACD0AE5F487484A5-pcap
  2. 2013-09-08 BIN_TrojanPage_86893886C7CBC7310F7675F4EFDE0A29-pcap
  3. 2013-09-08 BIN_Darkcomet_DC98ABBA995771480AECF4769A88756E-pcap
  4. 2013-09-02 8202_tbd_ 6D2C12085F0018DAEB9C1A53E53FD4D1-pcap
  5. 2013-09-02 BIN_8202_6d2c12085f0018daeb9c1a53e53fd4d1-pcap
  6. 2013-09-02 BIN_Vidgrab_6fd868e68037040c94215566852230ab-pcap
  7. 2013-09-02 BIN_PlugX_2ff2d518313475a612f095dd863c8aea-pcap
  8. 2013-09-02 BIN_Taidoor_46ef9b0f1419e26f2f37d9d3495c499f-pcap
  9. 2013-09-02 BIN_Vidgrab_660709324acb88ef11f71782af28a1f0-pcap
  10. 2013-09-02 BIN_Gh0st-gif_f4d4076dff760eb92e4ae559c2dc4525-pcap.zip
  11. 2013-07-15 BIN_Taleret.E_5328cfcb46ef18ecf7ba0d21a7adc02c.pcap
  12. 2013-05-14 BIN_Mediana_0AE47E3261EA0A2DBCE471B28DFFE007_2012-10.pcap
  13. 2013-05-14 BIN_Hupigon_8F90057AB244BD8B612CD09F566EAC0C
  14. 2013-05-14 BIN_LetsGo_yahoosb_b21ba443726385c11802a8ad731771c0_2011-07-19
  15. 2013-05-13 BIN_IXESHE_0F88D9B0D237B5FCDC0F985A548254F2-2013-05-pcap
  16. 2013-05-06 BIN_DNSWatch_protux_4F8A44EF66384CCFAB737C8D7ADB4BB8_2012-11-pcap
  17. 2013-05-06 BIN_9002_D4ED654BCDA42576FDDFE03361608CAA_2013-01-30-pcap
  18. 2013-05-06 BIN_BIN_RssFeeder_68EE5FDA371E4AC48DAD7FCB2C94BAC7-2012-06-pcap (not a common name, see the traffic ssheet http://bit.ly/maltraffic )
  19. 2013-04-30 BIN_MSWab_Yayih_FD1BE09E499E8E380424B3835FC973A8_us-pcap
  20. 2013-04-29 BIN_LURK_AF4E8D4BE4481D0420CCF1C00792F484_20120-10-pcap
  21. 2013-04-29 BIN_XTremeRAT_DAEBFDED736903D234214ED4821EAF99_2013-04-13-pcap
  22. BIN_Enfal_Lurid_0fb1b0833f723682346041d72ed112f9_2013-01.pcap
  23. BIN_Gh0st_variant-v2010_B1D09374006E20FA795B2E70BF566C6D_2012-08.pcap
  24. BIN_Likseput_E019E37F19040059AB5662563F06B609_2012-10.pcap
  25. BIN_Nettravler_1f26e5f9b44c28b37b6cd13283838366.pcap
  26. BIN_Nettravler_DA5832657877514306EDD211DEF61AFE_2012-10.pcap
  27. BIN_Sanny-Daws_338D0B855421867732E05399A2D56670_2012-10.pcap
  28. BIN_Sofacy_a2a188cbf74c1be52681f998f8e9b6b5_2012-10.pcap
  29. BIN_Taidoor_40D79D1120638688AC7D9497CC819462_2012-10.pcap
  30. BIN_TrojanCookies_840BD11343D140916F45223BA05ABACB_2012_01.pcap
  31. PDF_CVE-2011-2462_Pdf_2011-12.pcap
  32. RTF_Mongall_Dropper_Cve-2012-0158_C6F01A6AD70DA7A554D48BDBF7C7E065_2013-01.pcap
  33. OSX_DocksterTrojan.pcap


  1. 2013-11-12_BIN_ChePro_2A5E5D3C536DA346849750A4B8C8613A-1.pcap
  2. 2013-10-15_BIN_cryptolocker_9CBB128E8211A7CD00729C159815CB1C.pcap
  3. 2013-09-20_BIN_Lader-dlGameoverZeus_12cfe1caa12991102d79a366d3aa79e9.pcap
  4. 2013-09-08 BIN_Tijcont_845B0945D5FE0E0AAA16234DC21484E0-pcap
  5. 2013-09-08 BIN_Kelihos_C94DC5C9BB7B99658C275B7337C64B33-pcap.zip
  6. 2013-08-19 BIN_Nitedrem_508af8c499102ad2ebc1a83fdbcefecb-pcap
  7. 2013-08-17 BIN_sality_CEAF4D9E1F408299144E75D7F29C1810-pcap
  8. 2013-08-15 BIN_torpigminiloader-pcap.zip
  9. 2013-13-08 EK_popads_109.236.80.170_2013-08-13.pcap
  10. 2013-11-08 BIN_Alinav5.3_4C754150639AA3A86CA4D6B6342820BE.pcap
  11. 2013-08-08 BIN_BitcoinMiner_F865C199024105A2FFDF5FA98F391D74-pcap
  12. 2013-08-07 BIN_ZeroAccess_Sirefef_C2A9CCC8C6A6DF1CA1725F955F991940_2013-08-pcap
  13. 2013-07-05 BIN_Kuluoz-Asprox_9F842AD20C50AD1AAB41F20B321BF84B
  14. 2013-05-31 Wordpress-Mutopy_Symmi_20A6EBF61243B760DD65F897236B6AD3-2pcap.pcap
  15. 2013-05-15 BIN_Zeus_b1551c676a54e9127cd0e7ea283b92cc-2012-04.pcap
  16. 2013-05-15 BIN_Gypthoy_3EE49121300384FF3C82EB9A1F06F288-2013-05.pcap
  17. 2013-05-12 BIN_PassAlert_B4A1368515C6C39ACEF63A4BC368EDB2-2013-05-13
  18. 2013-05-12 BIN_HorstProxy_EFE5529D697174914938F4ABF115F762-2013-05-13-pcap
  19. 2013-05-12 BIN_Bitcoinminer_12E717293715939C5196E604591A97DF-2013-05-12-pcap
  20. 2013-05-07 BIN_ZeroAccess_Sirefef_29A35124ABEAD63CD8DB2BBB469CBC7A_2013-05-pcapc
  21. 2013-05-05 BIN_PowerLoader_4497A231DA9BD0EEA327DDEC4B31DA12_2013-05-pcap
  22. 2013-05-05 BIN_GameThief_ECBA0FEB36F9EF975EE96D1694C8164C_2013-03-pcap
  23. 2013-05-05 BIN_PowerLoader_4497A231DA9BD0EEA327DDEC4B31DA12_2013-05-pcap
  24. 2013-04-27 EK_BIN_Blackhole_leadingto_Medfos_0512E73000BCCCE5AFD2E9329972208A_2013-04-pcap
  25. 2013-04-26 -- BIN_Citadel_3D6046E1218FB525805E5D8FDC605361-2013-04-samp 
  26. BIN_CitadelPacked_2012-05.pcap
  27. BIN_CitadelUnpacked_2012-05.pcap
  28. BIN_Cutwail_284Fb18Fab33C93Bc69Ce392D08Fd250_2012-10.pcap
  29. BIN_Darkmegi_2012-04.pcap
  30. BIN_DarknessDDoS_v8g_F03Bc8Dcc090607F38Ffb3A36Ccacf48_2011-01.pcap-
  31. BIN_dirtjumper_2011-10.pcap
  32. BIN_DNSChanger_2011-12.pcap
  33. BIN_Drowor_worm_0f015bb8e2f93fd7076f8d178df2450d_2013-04.pcap
  34. BIN_Googledocs_macadocs_2012-12.pcap
  35. BIN_Imaut_823e9bab188ad8cb30c14adc7e67066d.pcap
  36. BIN_IRCbot_c6716a417f82ccedf0f860b735ac0187_2013-04.pcap
  37. BIN_Kelihos_aka_Nap_0feaaa4adc31728e54b006ab9a7e6afa.pcap
  38. BIN_LoadMoney_MailRu_dl_4e801b46068b31b82dac65885a58ed9e_2013-04 .pcap
  39. BIN_purplehaze-2012-01.pcap
  40. BIN_ponyloader_470a6f47de43eff307a02f53db134289.pcap
  41. BIN_Ramnitpcap_2012-01.pcap
  42. BIN_Reedum_0ca4f93a848cf01348336a8c6ff22daf_2013-03.pcap
  43. BIN_SpyEye_2010-02.pcap
  44. BIN_Stabuniq_F31B797831B36A4877AA0FD173A7A4A2_2012-12.pcap
  45. BIN_Tbot_23AAB9C1C462F3FDFDDD98181E963230_2012-12.pcap
  46. BIN_Tbot_2E1814CCCF0C3BB2CC32E0A0671C0891_2012-12.pcap
  47. BIN_Tbot_5375FB5E867680FFB8E72D29DB9ABBD5_2012-12.pcap
  48. BIN_Tbot_A0552D1BC1A4897141CFA56F75C04857_2012-12.pcap
  49. BIN_Tbot_FC7C3E087789824F34A9309DA2388CE5_2012-12.pcap
  50. BIN_Tinba_2012-06.pcap
  51. BIN_Vobfus_634AA845F5B0B519B6D8A8670B994906_2012-12.pcap
  52. BIN_Xpaj_2012-05.pcap
  53. BIN_ZeroAccess_3169969E91F5FE5446909BBAB6E14D5D_2012-10.pcap
  54. BIN_ZeusGameover_2012-02.pcap
  55. BIN_Zeus_2010-12.pcap
  56. EK_Blackholev1_2012-03.pcap
  57. EK_Blackholev1_2012-08.pcap
  58. EK_Blackholev2_2012-09.pcap
  59. EK_Blackhole_Java_CVE-2012-4681_2012-08.pcap
  60. EK_Phoenix_2012-04.pcap
  61. EK_Smokekt150(Malwaredontneedcoffee)_2012-09.pcap -  credit malware.dontneedcoffee.com

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PortWitness - Tool For Checking Whether A Domain Or Its Multiple Sub-Domains Are Up And Running

PortWitness is a bash tool designed to find out active domain and subdomains of websites using port scanning. It helps penetration testers and bug hunters collect and gather information about active subdomains for the domain they are targeting.PortWitness enumerates subdomains using Sublist3r and uses Nmap alongwith nslookup to check for active sites.Active domain or sub-domains are finally stored in an output file.Using that Output file a user can directly start testing those sites.
Sublist3r has also been integrated with this module.It's very effective and accurate when it comes to find out which sub-domains are active using Nmap and nslookup.
This tool also helps a user in getting the ip addresses of all sub-domains and stores then in a text file , these ip's can be used for further scanning of the target.

git clone https://github.com/viperbluff/PortWitness.git

This tool has been created using bash scripting so all you require is a linux machine.

bash portwitness.sh url

Related word

Vlang Binary Debugging

Why vlang? V is a featured, productive, safe and confortable language highly compatible with c, that generates neat binaries with c-speed, the decompilation also seems quite clear as c code.

After open the binary with radare in debug mode "-d" we proceed to do the binary recursive analysis with "aaaa" the more a's the more deep analys.

The function names are modified when the binary is crafted, if we have a function named hello in a module named main we will have the symbol main__hello, but we can locate them quicly thanks to radare's grep done with "~" token in this case applied to the "afl" command which lists all the symbols.

Being in debug mode we can use "d*" commands, for example "db" for breakpointing the function and then "dc" to start or continue execution.

Let's dissasemble the function with "pD" command, it also displays the function variables and arguments as well, note also the xref "call xref from main"

Let's take a look to the function arguments, radare detect's this three 64bits registers used on the function.

Actually the function parameter is rsi that contains a testing html to test the href extraction algorithm.

The string structure is quite simple and it's plenty of implemented methods.

With F8 we can step over the code as we were in ollydbg on linux.

Note the rip marker sliding into the code.

We can recognize the aray creations, and the s.index_after() function used to find substrings since a specific position.

If we take a look de dissasembly we sill see quite a few calls to tos3() functions.
Those functions are involved in string initialization, and implements safety checks.

  • tos(string, len)
  • tos2(byteptr)
  • tos3(charptr)

In this case I have a crash in my V code and I want to know what is crashing, just continue the execution with "dc" and see what poits the rip register.

In visual mode "V" we can see previous instructions to figure out the arguments and state.

We've located the crash on the substring operation which is something like "s2 := s1[a..b]" probably one of the arguments of the substring is out of bounds but luckily the V language has safety checks and is a controlled termination:

Switching the basic block view "space" we can see the execution flow, in this case we know the loops and branches because we have the code but this view also we can see the tos3 parameter "href=" which is useful to locate the position on the code.

When it reach the substr, we can see the parameters with "tab" command.

Looking the implementation the radare parameter calculation is quite exact.

Let's check the param values:

so the indexes are from 0x0e to 0x24 which are inside the buffer, lets continue to next iteration,
if we set a breakpoint and check every iteration, on latest iteration before the crash we have the values 0x2c to 0x70 with overflows the buffer and produces a controlled termination of the v compiled process.

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08 maio 2020


What is the process of hacking or phases of hacking?
Hacking is broken up into six phases:The more you get close to all phases,the more stealth will be your attack.

1-Reconnaissance-This is the primary phase of hacking where hacker tries to collect as much as information as possible about the target.It includes identifying the target,domain name registration records of the target, mail server records,DNS records.The tools that are widely used in the process is NMAP,Hping,Maltego, and Google Dorks.

2-Scanning-This makes up the base of hacking! This is where planning for attack actually begins! The tools used in this process are Nessus,Nexpose,and NMAP. After reconnaissance the attacker scans the target for services running,open ports,firewall detection,finding out vulnerabilities,operating system detection.

3-Gaining Access-In this process the attacker executes the attack based on vulnerabilities which were identified during scanning!  After the successful, he get access to the target network or enter in to the system.The primary tools that is used in this process is Metasploit.

4-Maintaining Access-It is the process where the hacker has already gained access in to a system. After gaining access the hacker, the hacker installs some backdoors in order to enter in to the system when he needs access in this owned system in future. Metasploit is the preffered toll in this process.

5-Clearning track or Covering track-To avoid getting traced and caught,hacker clears all the tracks by clearing all kinds of logs and deleted the uploaded backdoor and anything in this process related stuff which may later reflect his presence!

6-Reporting-Reporting is the last step of finishing the ethical hacking process.Here the Ethical Hacker compiles a report with his findings and the job that was done such as the tools used,the success rate,vulnerabilities found,and the exploit process.
Continue reading
  1. Social Hacking
  2. Hacking Linkedin
  3. El Libro Del Hacker
  4. Live Hacking
  5. Libros De Hacking Pdf
  6. Mindset Hacking Nacho
  7. Hacking With Python

Blockchain Exploitation Labs - Part 1 Smart Contract Re-Entrancy

Why/What Blockchain Exploitation?

In this blog series we will analyze blockchain vulnerabilities and exploit them ourselves in various lab and development environments. If you would like to stay up to date on new posts follow and subscribe to the following:
Twitter: @ficti0n
Youtube: https://www.youtube.com/c/ConsoleCowboys
URL: http://cclabs.io

As of late I have been un-naturally obsessed with blockchains and crypto currency. With that obsession comes the normal curiosity of "How do I hack this and steal all the monies?"

However, as usual I could not find any actual walk thorough or solid examples of actually exploiting real code live. Just theory and half way explained examples.

That question with labs is exactly what we are going to cover in this series, starting with the topic title above of Re-Entrancy attacks which allow an attacker to siphon out all of the money held within a smart contract, far beyond that of their own contribution to the contract.
This will be a lab based series and I will show you how to use demo the code within various test environments and local environments in order to perform and re-create each attacks for yourself.  

Note: As usual this is live ongoing research and info will be released as it is coded and exploited.

If you are bored of reading already and just want to watch videos for this info or are only here for the demos and labs check out the first set of videos in the series at the link below and skip to the relevant parts for you, otherwise lets get into it:

Background Info:

This is a bit of a harder topic to write about considering most of my audience are hackers not Ethereum developers or blockchain architects. So you may not know what a smart contract is nor how it is situated within the blockchain development model. So I am going to cover a little bit of context to help with understanding.  I will cover the bare minimum needed as an attacker.

A Standard Application Model:
  • In client server we generally have the following:
  • Front End - what the user sees (HTML Etc)
  • Server Side - code that handles business logic
  • Back End - Your database for example MySQL

A Decentralized Application Model:

Now with a Decentralized applications (DAPP) on the blockchain you have similar front end server side technology however
  • Smart contracts are your access into the blockchain.
  • Your smart contract is kind of like an API
  • Essentially DAPPs are Ethereum enabled applications using smart contracts as an API to the blockchain data ledger
  • DAPPs can be banking applications, wallets, video games etc.

A blockchain is a trust-less peer to peer decentralized database or ledger

The back-end is distributed across thousands of nodes in its entirety on each node. Meaning every single node has a Full "database" of information called a ledger.  The second difference is that this ledger is immutable, meaning once data goes in, data cannot be changed. This will come into play later in this discussion about smart contracts.


The blockchain of these decentralized ledgers is synchronized by a consensus mechanism you may be familiar with called "mining" or more accurately, proof of work or optionally Proof of stake.

Proof of stake is simply staking large sums of coins which are at risk of loss if one were to perform a malicious action while helping to perform consensus of data.   

Much like proof of stake, proof of work(mining) validates hashing calculations to come to a consensus but instead of loss of coins there is a loss of energy, which costs money, without reward if malicious actions were to take place.

Each block contains transactions from the transaction pool combined with a nonce that meets the difficulty requirements.  Once a block is found and accepted it places them on the blockchain in which more then half of the network must reach a consensus on. 

The point is that no central authority controls the nodes or can shut them down. Instead there is consensus from all nodes using either proof of work or proof of stake. They are spread across the whole world leaving a single centralized jurisdiction as an impossibility.

Things to Note: 

First Note: Immutability

  • So, the thing to note is that our smart contracts are located on the blockchain
  • And the blockchain is immutable
  • This means an Agile development model is not going to work once a contract is deployed.
  • This means that updates to contracts is next to impossible
  • All you can really do is createa kill-switch or fail safe functions to disable and execute some actions if something goes wrong before going permanently dormant.
  • If you don't include a kill switch the contract is open and available and you can't remove it

Second Note:  Code Is Open Source
  • Smart Contracts are generally open source
  • Which means people like ourselves are manually bug hunting smart contracts and running static analysis tools against smart contract code looking for bugs.

When issues are found the only course of action is:
  • Kill the current contract which stays on the blockchain
  • Then deploy a whole new version.
  • If there is no killSwitch the contract will be available forever.
Now I know what you're thinking, these things are ripe for exploitation.
And you would be correct based on the 3rd note

Third Note: Security in the development process is lacking
  • Many contracts and projects do not even think about and SDLC.
  • They rarely add penetration testing and vulnerability testing in the development stages if at all
  • At best there is a bug bounty before the release of their main-nets
  • Which usually get hacked to hell and delayed because of it.
  • Things are getting better but they are still behind the curve, as the technology is new and blockchain mostly developers and marketers.  Not hackers or security testers.

Forth Note:  Potential Data Exposure via Future Broken Crypto
  • If sensitive data is placed on the blockchain it is there forever
  • Which means that if a cryptographic algorithm is broken anything which is encrypted with that algorithm is now accessible
  • We all know that algorithms are eventually broken!
  • So its always advisable to keep sensitive data hashed for integrity on the blockchain but not actually stored on the blockchain directly

 Exploitation of Re-Entrancy Vulnerabilities:

With a bit of the background out of the way let's get into the first attack in this series.

Re-Entrancy attacks allow an attacker to create a re-cursive loop within a contract by having the contract call the target function rather than a single request from a  user. Instead the request comes from the attackers contract which does not let the target contracts execution complete until the tasks intended by the attacker are complete. Usually this task will be draining the money out of the contract until all of the money for every user is in the attackers account.

Example Scenario:

Let's say that you are using a bank and you have deposited 100 dollars into your bank account.  Now when you withdraw your money from your bank account the bank account first sends you 100 dollars before updating your account balance.

Well what if when you received your 100 dollars, it was sent to malicious code that called the withdraw function again not letting  the initial target deduct your balance ?

With this scenario you could then request 100 dollars, then request 100 again and you now have 200 dollars sent to you from the bank. But 50% of that money is not yours. It's from the whole collection of money that the bank is tasked to maintain for its accounts.

Ok that's pretty cool, but what if that was in a re-cursive loop that did not BREAK until all accounts at the bank were empty?  

That is Re-Entrancy in a nutshell.   So let's look at some code.

Example Target Code:

           function withdraw(uint withdrawAmount) public returns (uint) {
1.         require(withdrawAmount <= balances[msg.sender]);
2.         require(msg.sender.call.value(withdrawAmount)());

3.          balances[msg.sender] -= withdrawAmount;
4.          return balances[msg.sender];

Line 1: Checks that you are only withdrawing the amount you have in your account or sends back an error.
Line 2: Sends your requested amount to the address the requested that withdrawal.
Line 3: Deducts the amount you withdrew from your account from your total balance.
Line 4. Simply returns your current balance.

Ok this all seems logical.. however the issue is in Line 2 - Line 3.   The balance is being sent back to you before the balance is deducted. So if you were to call this from a piece of code which just accepts anything which is sent to it, but then re-calls the withdraw function you have a problem as it never gets to Line 3 which deducts the balance from your total. This means that Line 1 will always have enough money to keep withdrawing.

Let's take a look at how we would do that:

Example Attacking Code:

          function attack() public payable {
1.           bankAddress.withdraw(amount);

2.    function () public payable {
3.            if (address(bankAddress).balance >= amount) {
4.               bankAddress.withdraw(amount);

Line 1: This function is calling the banks withdraw function with an amount less than the total in your account
Line 2: This second function is something called a fallback function. This function is used to accept payments that come into the contract when no function is specified. You will notice this function does not have a name but is set to payable.
Line 3:  This line is checking that the target accounts balance is greater than the amount being withdrawn.
Line 4:  Then again calling the withdraw function to continue the loop which will in turn be sent back to the fallback function and repeat lines over and over until the target contracts balance is less than the amount being requested.

Review the diagram above which shows the code paths between the target and attacking code. During this whole process the first code example from the withdraw function is only ever getting to lines 1-2 until the bank is drained of money. It never actually deducts your requested amount until the end when the full contract balance is lower then your withdraw amount. At this point it's too late and there is no money left in the contract.

Setting up a Lab Environment and coding your Attack:

Hopefully that all made sense. If you watch the videos associated with this blog you will see it all in action.  We will now analyze code of a simple smart contract banking application. We will interface with this contract via our own smart contract we code manually and turn into an exploit to take advantage of the vulnerability.

Download the target code from the following link:

Then lets open up an online ethereum development platform at the following link where we will begin analyzing and exploiting smart contracts in real time in the video below:

Coding your Exploit and Interfacing with a Contract Programmatically:

The rest of this blog will continue in the video below where we will  manually code an interface to a full smart contract and write an exploit to take advantage of a Re-Entrency Vulnerability:



In this smart contract exploit writing intro we showed a vulnerability that allowed for re entry to a contract in a recursive loop. We then manually created an exploit to take advantage of the vulnerability. This is just the beginning, as this series progresses you will see other types of vulnerabilities and have the ability to code and exploit them yourself.  On this journey through the decentralized world you will learn how to code and craft exploits in solidity using various development environments and test nets.
More info
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  2. Libros Para Aprender A Hackear
  3. Elhacker Ip
  4. Tools For Hacking Wifi
  5. Hacking Linux Distro
  6. Mundo Hacker
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07 maio 2020



Footpriting is the technique used for gathering information about computer systems and the entities they belongs too. 
To get this information, a hacker might use various tools and technologies.

Basically it is the first step where hacker gather as much information as possible to find the way for cracking the whole system or target or atleast decide what types of attacks will be more suitable for the target.

Footpriting can be both passive and active.

Reviewing a company's website is an example of passive footprinting, 
whereas attempting to gain access to sensititve information through social engineering is an example of active information gathering.

During this phase hacking, a hacker can collect the following information>- Domain name
-IP Addresses
-Employee information 
-Phone numbers
Job information

Tip-You can use http://www.whois.com/ website to get detailed information about a domain name information including its owner,its registrar, date of registration, expiry, name servers owner's contact information etc.

Use of  Footprinting & Information Gathering in People Searching-
Now a days its very easy to find anyone with his/her full name in social media sites like Facebook, Instragram,Twitter,Linkdedin to gather information about date of birth,birthplace, real photos, education detail, hobbies, relationship status etc.

There are several sites like PIPL,PeekYou, Transport Sites such as mptransport,uptransport etc and Job placement Sites such as Shine.com,Naukari.com , Monster.com etc which are very useful for hacker to collect information about anyone.  
Hacker collect the information about you from your Resume which you uploaded on job placement site for seeking a job as well as  hacker collect the information from your vehicle number also from transport sites to know about the owner of vehicle, adderess etc then after they make plan how to attack on victim to earn money after know about him/her from collecting information.

INFORMATION GATHERING-It is the process of collecting the information from different places about any individual company,organization, server, ip address or person.
Most of the hacker spend his time in this process.

Information gathering plays a vital role for both investigating and attacking purposes.This is one of the best way to collect victim data and find the vulnerability and loopholes to get unauthorized modifications,deletion and unauthorized access.

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Bloquear Teclado Y Mouse En Windows

Bloquear el teclado y el mouse en Windows hoy en día ya no es un lió, y aunque existen varios métodos para dicho procedimiento queremos presentar un software muy seguro capaz de bloquear en segundos todas las funciones de estos periféricos. No queremos profundizar en las funciones que están alojadas en el sistema de Windows para evitar vueltas innecesarias, simplemente utilizaremos un software que después de estar instalado podemos desactivar y activar de manera rápida.
Creemos que muchos de ustedes que están dando lectura a este bloc ya conocen de manera lógica los procedimientos a utilizar para que funcione a la perfección este complemento, o simplemente perciben otra fórmula sin necesidad de instalar programas, pero si realizamos alguna encuesta sabemos que un 70% de nuestros seguidores desconocen de lleno la existencia de poder bloquear teclado y ratón (mouse) de nuestro ordenador.
Sin más que decir vamos a proceder con el tutorial explicando la forma de cómo se utiliza y la manera correcta de poder asegurar nuestro ordenador para que nadie lo pueda manipular cuando no estamos cerca de la pantalla.
Los pasos a seguir seria descargar e instalar "Keyboard and Mouse" el cual dejamos el enlace al final del artículo, La instalación no es necesario explicar ya que es un programa portable que no necesita conocimiento para el mismo. Cuando ejecutes el software en modo administrador vas a conocer una interfaz simple y ya configurada con una secuencia de botones que trae por defecto los cuales puede modificar a su gusto.
Es fundamental no colocar dígitos difíciles y largos, para cuando quiera desbloquear su ordenador lo haga de manera rápida y sin problemas. No es necesario poner el más (+) ya que el programa automáticamente hace el trabajo, simplemente escribe la serie que recordara de forma normal y cuando lo tengas listo presionamos el botón (Lock) o la letra (L), esperamos 5 segundos y ya todo estará inhabilitado.
Una vez ejecutado, el teclado y Mouse quedaran bloqueados sin poder usarlos como es debido. Es importante tener marcada la casilla "Show Tool Tip" para recibir información en la pantalla sobre las teclas que se deben forzar para desbloquear.
Ya todo queda a su disposición para que pruebes la funcionalidad de Keyboard, que sin duda es un programa muy simple y útil para situaciones donde queremos dejar por unos minutos nuestro ordenador expuesto a personas traviesas. No olvides compartir y seguirnos en las diferentes redes sociales, su ayuda nos hace crecer. También te puede interesar:(Cómo recuperar la clave de inicio de Windows)

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