Small.CGS

Threat description

Details

CATEGORYTrojan

Summary

We got reports of this trojan downloader on Jan 27th 2006. The trojan downloader was spammed to a large amount of e-mail addresses. The downloader is programmed to download a backdoor from website.



Removal

Automatic action

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Technical Details

The trojan's file is a PE executable file packed with FSG file compressor. According to reports, the trojan was spammed in messages that looked like this:

Subject: YOUR BILL PAYMENT NOT APPROVED!Attachment: BILL_235563880.EXE  

When the attachment is run, the trojan first tries to add its file to Windows XP built-in firewall policy using the following key:

[HKLM\PATH_TO_FW_POLICY\AuthorizedApplications\List]  

After that, the trojan tries to download and activate backdoor from web site dalvabrothersinc.com . The backdoor is already detected as Trojan.Win32.Delf.qx with FSAV updates version 2005-12-23_1.

Detection

Small.CGS is detected with the following F-Secure Anti-Virus updates:

Detection Type: PC

Database: 2006-01-27_01

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