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Panda Protection

Virus Encyclopedia

Welcome to the Virus Encyclopedia of Panda Security.

Sikou.A

Threat LevelHigh threatDamageSevereDistributionNot widespread
Common name:Sikou.A
Technical name:Trj/Sikou.A
Threat level:Medium
Type:Trojan
Effects:  

It follows a certain process in order to receive remote control commands: download and run file, shut down the computer, etc. It reaches the computer embedded in a specially crafted Word document that exploits a vulnerability described in Microsoft bulletin MS03-037.

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Affected platforms:

Windows XP/2000/NT/ME/98

First detected on:June 22, 2005
Detection updated on:June 22, 2005
StatisticsNo
Proactive protection:
Yes, using TruPrevent Technologies

Brief Description 

    

Sikou.A is a Trojan that connects to a certain IP address in order to download and install a Dynamic Link Library (DLL) on the affected computer.

Then, this DLL connects to another IP address and downloads other file, which contains remote control commands that the Trojan will carry out. Some of those commands are downloading and running files, shutting down the computer, etc.

Sikou.A repeats this process over and over in order to download the auxiliary DLL, so that the Trojan author is able to order new control commands to all affected computers just by updating the auxiliary DLL in the server from which it is downloaded.

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Sikou.A reaches the computer embedded in a specially crafted Word document, which exploits the vulnerability described in Microsoft bulletin MS03-037 in order to execute the Trojan when the user opens the document.

Visible Symptoms 

    

Sikou.A is difficult to recognize, as it does not display any messages or warnings that indicate it has reached the computer.