Threat description




Trojan:W32/Agent.KOG is a trojan that is capable of functioning as a backdoor.


Automatic action

Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.

More scanning & removal options

More information on the 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

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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