Threat Description



Aliases: Trojan:W32/Agent.KOG, Trojan.Agent.AOGF, Trojan.Win32.VB.aadm, Trojan.Hydraq (Symantec)
Category: Malware
Type: Trojan
Platform: W32


Also known as a trojan horse program, this is a deceptive program that performs additional actions without the user's knowledge or permission. It does not replicate.


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

Trojan:W32/Agent.KOG is a trojan that is capable of functioning as a backdoor. Once installed on a machine, Agent.KOG allows remote attackers to connect to the infected machine and steal information from it.The trojan itself is a Windows DLL component may be dropped on the system as part of the payload of another malware. Installation on execution, the DLL component is installed as a Windows service. To do so, the following registry keys are created:

  • [HKLM\SYSTEM\CurrentControlSet\Services\RaS{4 random characters}] "ErrorControl" = dword:00000004 "Start" = dword:00000004 "ImagePath" = "%systemroot%\system32\svchost.exe -k netsvcs" "ObjectName" = "LocalSystem"

It aslo creates the following subkeys:

  • [HKLM\SYSTEM\CurrentControlSet\Services\RaS{4 random characters}\Security]
  • [HKLM\SYSTEM\CurrentControlSet\Services\RaS{4 random characters}\Parameters]

In addition, it also modifies the registry data "netsvcs" in the existing svchost service:

  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SvcHost\"netsvcs"

to function as a launchpoint for the trojan backdoor.


Once installed, the DLL component uses the Windows socket to send data from the infected machine to an external server, as well as potentially receiving data/commands from the remote attacker.


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