Threat description


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


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.


More information on scanning and removal options available in your F-Secure product can be found in the Help Center.

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

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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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