"Skype" Trojan analysis

Friday, 5 January 2007, 12:06 AM EST

This trojan uses interesting techniques such as encrypted data, obfuscated function loading, delta based data addressing (for injected code), its own IAT-like array that get injected into the remote processes, the offsets made up to call various subfunctions (no direct cross references), the download of payloads from a remote website for execution on the heap, and etc.

The file was protected with "NTkrnl Secure Suite", a commercial protection system using anti-cracking techniques, polymorphic engines, and other interesting features.

At the Websense blog.

[ Read more ]




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