Threat Description



Aliases: Rootkit:W32/Agent.TZ, Trojan-Clicker.Win32.VB.ath
Category: Malware
Type: Rootkit
Platform: W32


A program or set of programs which hides itself by subverting or evading the computer's security mechanisms, then allows remote users to secretly control the computer's operating system.


Automatic action

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


Detailed instructions for F-Secure security products are available in the documentation found in the Downloads section of our Home - Global site.

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

Technical Details

Agent.TZ creates the following device object and symbolic link so that Worm:W32/VB.KS (usermode) can open a handle to the driver.

  • \Device\hideproc
  • \DosDevices\hideproc

It processes the control code sent by Worm:W32/VB.KS so that its process will be hidden in the process list.It uses a Direct Kernel Object Manipulatin (DKOM) technique for hiding processes.


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