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:

• %temp%winlogon.exe

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:

• sys.bat

To enable automatic execution upon system boot, it adds the following auto start registry:

• HKCU\SoftwareMicrosoftWindowsCurrentVersionRun
  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:

• 72.232.49.214

Commands from the server may include downloading of files and spamming mails.

Last update 02 April 2007

 

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