Also detected as:
Alerts from your security software may be the only symptom.
Microsoft security software
detects and removes this threat.
This threat uses stealth to hide itself. Threats in this family can do different things, including:
They can also change search results, which can generate money for the malicious hackers who use Sirefef.
Variants of Win32/Sirefef may be installed by other malware, including variants of the Trojan:Win32/Necurs family.
See the Win32/Sirefef family description for more information.
The following free Microsoft software detects and removes this threat:
If you're having trouble cleaning Win32/Sirefef, the Microsoft Safety Scanner may help you remove it:
After you've used the Microsoft Safety Scanner, you should make sure your security software is up to date and run a full scan:
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.
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:
You can also visit the Microsoft virus and malware community for more help.
Take these steps to help prevent infection on your PC.
I want to...
Note: Your feedback is important to us, however we do not respond to individual concerns through this channel.
If you require support, please visit the
Microsoft Answer Desk.
If you suspect that a file has been incorrectly identified as malware, you can submit the file for analysis.