GetCodec Multimedia Trojan Analysis

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Executive Summary

A new trojan was spotted spreading in the wild, infecting multi-media files on end-user PCs with malicious content. The interesting detail about the malware is that its code embedding functionality is based on the ASF (Advanced Systems Format) format. ASF is Microsoft's proprietary digital audio/digital video container format, especially meant for streaming media. ASF is part of the Windows Media framework. The format does not specify how (i.e. with which codec) the video or audio should be encoded; it just specifies the structure of the video/audio stream. This is similar to the function performed by the QuickTime, AVI, or Ogg container formats.

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