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.
Get more help
You can also see our advanced troubleshooting page for more help.
If you’re using Windows XP, see our Windows XP end of support page.
Additional removal steps
Note that as part of the cleaning, our software might change some Windows services back to their default settings. If you had previously changed these settings, you might need to change them again.
The services that are reset include:
BFE – Base Filtering Engine
Iphlsvc – IP helper Service
MSMpSvc – Microsoft Antimalware service – MSE/FEP/SCEP
Sharedaccess – Internet Connection Sharing
WinDefend – Microsoft Antimalware service
Wscsvc - Windows Security Center
See our advanced troubleshooting page for more help and tools if you're having trouble with Win32/Sirefef.