Threat Description

Rootkit: ​W32/Agent.EA


Category: Malware
Type: RootkitTrojan
Platform: W32
Aliases: Rootkit:​W32/Agent.EA, Rootkit.Win32.Agent.ea


Rootkit:W32/Agent.EA is a kernel-mode rootkit program that is capable of hiding its presence and activity from the user. While active, the rootkit uses the infected computer to sends spam messages.


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


Agent.EA arrives as a dropper that installs the main driver of the trojan and deletes itself. Upon execution, it creates the following file:

  • %System%\windbg48.sys

It installs the driver file as service by creating the following registry key:

  • HKLM\System\CurrentControlSet\Services\windbg48

The dropper deletes itself with the following batch file:

  • %Temp%\_uninsep.bat

When the driver file is activated, it might connect to one of the following remote sites in an attempt to retrieve spam messages:


The driver also hides itself, its registry keys, and network traffic using rootkit techniques. The spamming routine is also implemented entirely in the kernel-mode component (windbg48.sys).


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