Delf.h

Classification

Malware

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Delf.h, SpamTool.Win32.Delf.h, London Bombing trojan, Spam-SPM trojan, Troj/Spexta-A, Trojan.Spexta, TROJ_DONBOMB.A

Summary

This remotely controlled trojan appeared on July 8th, 2005, just after terrorists attacked London. It was spead with an HTML-based email that contained news about explosions.

Removal

Automatic action

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

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Technical Details

The trojan is a PE executable file 82432 bytes long, packed with UPX file compressor.

The trojan was spread in email messages that looked like that:

The trojan was sent in that email as a ZIPped attachment named 'LondonTerrorMovie.zip'. The trojan's file name inside the archive was:

 London Terror Movie.avi      Checked By Norton Antivirus.exe  

When the trojan's file is run, it copies itself to Windows folder with one of the following names:

 London Terror Movie.aviChecked By Norton Antivirus.exe

The trojan sets read-only, hidden and system attributes to the copied file. Then the trojan adds a startup key value for its file to the Registry:

 [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]  " manager" = "%WinDir%\.exe"   

OR

 [HKLM\Software\Microsoft\Windows\CurrentVersion\Run]  " manager" = "%WinDir%\.exe"   

where %WinDir% stands for Windows directory name and <filename> stands for the trojan's file name, for example:

 London Terror Movie.aviChecked By Norton Antivirus.exe

OR

 London Terror Movie.aviChecked By Norton Antivirus.exe

The trojan is used by spammers to send emails from infected computers. The trojan can be remotely controlled to send email and to upgrade its file from Internet.

When sending spam emails, the trojan can generate fake sender's email addresses automatically using the following string arrays:

 London Terror Movie.aviChecked By Norton Antivirus.exe

The trojan uses the following fake mailer tags:

 London Terror Movie.aviChecked By Norton Antivirus.exe

Date Created: -

Date Last Modified: -