Threat description


Category: Malware
Type: Trojan
Platform: W32
Aliases: Trojan:​W32/Yakes, Trojan:​W32/Yakes.B, Trojan:​W32/Yakes.N


Trojan:W32/Yakes variants attempt to connect to and download files from remote servers.


Automatic action

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


You may wish to refer to the Support Community for further assistance. You may also refer to General Removal Instructions for a general guide on alternative disinfection actions.

Technical Details

The technical details below describe both the .B and .N variants of this family.


On execution, the trojan creates the following temporary file

  • %temp%\bh.tmp

The TMP file is a text file containing a 32 hexadecimal string in UUID/GUID format. This string is the same as the parameter fed to the websites the trojan connects to.


When active, Yakes attempts to connect to and download files from two Russian forums.

As part of its activity, the trojan sets the following registry launchpoint:

  • HKCU\Software\Microsoft\Windows\CurrentVersion\Run PID = [Path of the malware sample]


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