Threat Description

Trojan-Downloader: W32/Kazy-17907


Category: Malware
Type: Trojan-Downloader
Platform: W32
Aliases: Trojan-Downloader:W32/Kazy-17907, Gen:variant.kazy.17907


This type of trojan secretly downloads malicious files from a remote server, then installs and executes the files.


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

For further assistance, F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.

Technical Details

This trojan-downloader appears to be related to a distribution of spam e-mails currently under way as of 5 April 2011, as hundreds of samples were submitted to our analysis systems in the last 24 hrs.

The spammed e-mail uses a social engineering attack to lure the recipient into clicking on an attached executable file. This attachment is actually the trojan-downloader, disguised as a legitimate document. The attachment uses a PDF file icon and the filename 'dhl.exe' to further disguise itself.

On clicking the file, the trojan-downloader is executed and creates a dummy svchost.exe process. It then injects a thread that downloads and executes a file from:

  • h t t p : / /[...].exe

At the time of writing, the domain is blocked by the Browsing Protection feature of our product.


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