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Ransomcrypt Decryption Script

19

Apr

2012

Last week, we wrote about a ransom trojan called Trojan:W32/Ransomcrypt which encrypts documents, images, videos, et cetera and holds the files hostage for ?50. Ransomcrypt encrypts files using Tiny Encryption Algorithm (TEA). The key is formed from a “base key” which is modified based on the first character of the name of the file that […]

Category General Written by F-Secure Antivirus Research Weblog 0 Comments

Teensy PDF Dropper Part 2

27

Feb

2012

Last year I showed how to use a Teensy micro-controller to drop a PDF file with embedded executable. But I was limited to a file of a few kilobytes, because of the Arduino programming language I used for the Teensy.In this post, I’m using WinAVR and I’m only limited by the amount of flash memory […]

Category Security Written by Didier Stevens 0 Comments

Android malware employs steganography

30

Jan

2012

Amidst my usual adventure with Android malware analysis, I saw this snippet of code while skimming through a particular sample’s class modules. Figure 1 Late last year, I was looking deeper into Portable Network Graphics (PNG) image format, especially about the fields that hold textual information. Upon seeing the code, it immediately triggered my suspicion […]

Category General Written by F-Secure Antivirus Research Weblog 0 Comments

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Android malware employs steganography

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