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.

Suspect a file is incorrectly detected (a False Positive)?

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest detection database updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    NOTE If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note You need administrative rights to change the settings.

Find out more

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Submit a sample

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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