Threat Descriptons



Category :


Type :


Aliases :, Gen:Trojan.Heur.Vilsel.1, TrojanDownloader:Win32/Agent.KY (Microsoft) , Vilsel trojan (McAfee)


Variants in the Trojan:W32/Vilsel family download a file onto the system.


Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

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

While active, the trojan also connect to and downloads files from the following website:


Registry Changes

Trojan:W32/Vilsel disables the Windows firewall by modifying the registry entry:

  • HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile EnableFirewall = 0

It also makes changes to the following registry keys:

  • HKU\S-1-5-21-299502267-823518204-839522115-1003\Software\Microsoft\windows\CurrentVersion\Internet Settings MigrateProxy = 1
  • HKU\S-1-5-21-299502267-823518204-839522115-1003\Software\Microsoft\windows\CurrentVersion\Internet Settings ProxyEnable = 0
  • HKLM\SYSTEM\CURRENTCONTROLSET\HARDWARE PROFILES\CURRENT\Software\Microsoft\windows\CurrentVersion\Internet Settings ProxyEnable = 0
  • HKU\S-1-5-21-299502267-823518204-839522115-1003 SavedLegacySettings =
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