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.
Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.
Detailed instructions for F-Secure security products are available in the documentation found in the Downloads section of our Home - Global site.
You may also refer to the Knowledge Base on the F-Secure Community site for further assistance.
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:
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.
Small.CGS is detected with the following F-Secure Anti-Virus updates:
Detection Type: PC
Description Details: Jarkko Turkulainen, January 27, 2006
Technical Details:Jarkko Turkulainen, January 27, 2006