Threat Descriptons



Category :


Type :


Aliases :

Trojan:​W32/Agent.ARKD, Trojan.Agent.ARKD, Trojan.Generic.5594507


Trojan:W32/Agent.ARKD attempts to connect to a remote host and download an additional malicious file onto the infected system.


  1. Open the Registry Editor. To do so, select Run from the Start Menu; type "regedit" into the Open: field and click OK.
  2. Once the Registry Editor has launched, navigate to the following registry key:
    • HKLM\System\CurrentControlSet\Services\srv[numbers]
  3. Check if the servicedll value in the registry key's parameters is:
    • %temp%srv[numbers].tmp
  4. If the servicedll value is as above, right-click on the icon for the srv[numbers] folder in the Registry Editor's navigation pane, and then select "Permission...".
  5. In the Permissions menu, click on SYSTEM under "Group or user names:"
  6. In the Permissions for SYSTEM menu, check the Deny box for Full Control, and then click Apply.
  7. Go back to the servicedll value in the registry key's parameters, right-click on it and select Delete.
  8. Refresh the page by pressing the F5 key to make sure the servicedll value is not recreated.
  9. Reboot the system.
  10. On Windows startup, perform a full computer system scan with F-Secure Anti-Virus.

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note: You need administrative rights to change the settings.

Technical Details

The associated detections Trojan.Agent.ARKD and Trojan.Generic.5594507 both triggered on a DLL file named setup50045.fon, which was associated with a malware attack.


Upon execution, setup50045.fon drops a copy of itself in the following directory:

  • %temp%\srv[numbers].ini
  • %temp%\srv[numbers].tmp (hidden)

It will then set itself as a launch point service by setting the following values in the registry:

  • HKLM\System\CurrentControlSet\Services\srv[numbers] ImagePath = %systemroot%\system32\svchost.exe -k netsvcs
  • HKLM\System\CurrentControlSet\Services\srv[numbers] servicedll= %temp%\srv[numbers].tmp

Network Connection

Once installed, the malware attempts to establish connection with the following remote hosts:


It downloads a malicious executable file from the link below:


The downloaded executable is detected as Trojan.Agent.ARKE.

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