Microsoft security software detects and removes this threat.

It is a file used by Trojan:Win32/Sefnit.gen!D, which is part of the Win32/Sefnit family of trojans. These trojans can let a hacker access your PC, download files, and use your PC and Internet connection for click fraud.

This threat might have gotten on your PC from a bad or infected file on the eMule peer-to-peer network.

Find out ways that malware can get on your PC.  

What to do now

The following free Microsoft software detects and removes this threat:

Even if we've already detected and removed this particular threat, running a full scan might find other malware that is hiding on your PC.

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

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

Threat behavior

See the Trojan:Win32/Sefnit.gen!D and Win32/Sefnit descriptions for more information about this family.


Alerts from your security software may be the only symptom.


Alert level: Severe
First detected by definition:
Latest detected by definition: 1.173.2181.0 and higher
First detected on: Oct 19, 2013
This entry was first published on: Oct 19, 2013
This entry was updated on: Apr 11, 2014

This threat is also detected as:
No known aliases