Gop (worm)

Threat description

Details

CATEGORYMalware
TYPEWorm

Summary

Gop is a worm that spreads via the Internet being attached to infected emails and through local network by copying to shared drives. The worm itself is a Windows PE EXE file about 60Kb of length (compressed by UPX), written in Delphi Microsoft Visual C++.



Removal

Automatic action

Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.

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You may also refer to the Knowledge Base on the F-Secure Community site for more information.

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Technical Details

The worm is improved variant of a password stealing trojan Trojan.PSW.GOP (trojan).

The infected messages Subject and Body are in Chinese. The attached file name is different, and has double extension:

filename.jpg.exe  filename.jpeg.exe  filename.gif.exe  filename.txt.exe  filename.doc.exe  filename.rtf.exe  filename.bmp.exe  

To run from infected message the worm uses IFrame security breach.

While installing the worm uses the same way as "GOPtrojan", the additional feature is affected Registry key:

HKCR\exefile\shell\open\command  

To send infected messages the worm uses direct access to a SMTP server. The worm gets victim email addresses by scanning *.HTML, *.HTM, *.JS files, as well as by scanning TheBat, Aerofox and RimArts email databases.

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