Published Nov 15, 2005 | Updated Sep 15, 2017


Severe |Detected with Windows Defender Antivirus

Aliases: No associated aliases


Windows Defender Antivirus detects and removes this threat.
Win32/Ryknos is a family of backdoor Trojans that targets computers running certain versions of Microsoft Windows. The trojan opens a backdoor on the infected computer to receive commands from attackers. If the rootkit WinNT/F4IRootkit is already installed on the target computer, the Trojan uses the rootkit to hide.

Use the following free Microsoft software to detect and remove this threat:

You should also run a full scan. A full scan might find hidden malware.

Get more help

You can also visit our advanced troubleshooting page or search the Microsoft virus and malware community for more help.

If you’re using Windows XP, see our Windows XP end of support page.

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