Threat Description

Small.CGS

Details

Aliases: Small.CGS
Category: Malware
Type: Trojan
Platform: W32

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 Disinfection

Allow F-Secure Anti-Virus to disinfect the relevant files.

For more general information on disinfection, please see Removal Instructions.



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



Description Created: Jarkko Turkulainen, January 27, 2006
Technical Details: Jarkko Turkulainen, January 27, 2006


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