Category Archives: CTF

Bypass WAF with MySQL REGEXP

In this post I want to share a trick that helps me to bypass a WAF (Web Application Firewall) when solving a challenge in a CTF-like penetration testing laboratory called PENTESTIT TEST LAB 11. After registering on https://lab.pentestit.ru/ you will be … Continue reading

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RCTF Crypto 100 Decode The File

File: cip_d0283b2c5b4b87423e350f8640a0001e MD5: d0283b2c5b4b87423e350f8640a0001e SHA256: 1b13fdec1c3a0da404ad53d4f9130f84ba5f3d7708650f52fb328bb7abf65ba8 If you open the file with a text editor, you can see the following content: Obviously, the data here is encoded by Base64 algorithm, let’s decode it: The above picture shows the decoded content, by searching the … Continue reading

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RCTF Reverse 300 Creack Me

Name: crackMe_aafb0addeb58dece1fcf631a183c2b20 MD5: AAFB0ADDEB58DECE1FCF631A183C2B20 SHA256: 3091F5DF9D1D4E470B36DD8AFBBFEB7F03A5398B3F8846B892425F4BCD890E20 The file of this challenge is a Windows Portable Executable packed with UPX and it can be unpacked with the UPX utility: The unpacked file introduced some simple anti mechanisms, the first one is located … Continue reading

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FLARE On Challenge (2015) #11

This is the final challenge and it is said to be more difficult than the previous challenges. The file of this challenge named CryptoGraph, which is a 32 bit Windows Portable Executable file. Let’s analyze it in IDA at first. … Continue reading

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FLARE On Challenge (2015) #10

This challenge contains a large Windows Portable Executable File which is nearly 3.4 MB. It is usually difficult to reverse engineering such a large file. However, if you have noticed the special resource embedded into this file, things will become … Continue reading

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