Additional Details
Trojan-Proxy:W32/Grum.A may arrive in the system as spam e-mail containing an image that links to the real malware.
Here the image associated with the spam:

Click
here for details about spam on our
weblog.
This malware is hosted in the following links:
• http://tvz-archive.com/I[REMOVED}.exe
• http://abnoba.net/I[REMOVED]0.exe
Upon execution of Trojan-Proxy:W32/Grum.A it creates a copy of itself in the following path and filename:
Trojan-Proxy:W32/Grum.A uses the following batch file created on the same directory where the malware was to delete the executed copy of itself:
To enable automatic execution upon system boot, it adds the following auto start registry:
• HKCU\\Software\Microsoft\Windows\CurrentVersion\Run
Firewall auto setup = %temp%\winlogon.exe
Note: %temp% is the temporary windows folder
Trojan-Proxy:W32/Grum.A is a kernel malware that hooks several ntdll APIs to hide its file and process.
Trojan-Proxy:W32/Grum.A serves as a proxy server that communicates to the following address:
Commands from the server may include downloading of files and spamming mails.