Published Nov 15, 2010 | Updated Sep 15, 2017


Severe |Detected with Windows Defender Antivirus

Aliases: Trojan.Fakealert.15309 (Dr.Web) Win32/Adware.IScan.A (ESET) SoftwareBundler:Win32/NetPumper.A (other) TROJ_FAKEAV.SMTF (Trend Micro) One Scan (other) Siren114 (other) EnPrivacy (other) PC Trouble (other) My Vaccine (other)


Windows Defender detects and removes this threat.

This family of rogue security programs pretend to scan your PC for malware, and often report lots of infections. The program will say you have to pay for it before it can fully clean your PC.

However, the program hasn't really detected any malware at all and isn't really an antivirus or antimalware scanner. It just looks like one so you'll send money to the people who made the program. Some of these programs use product names or logos that unlawfully impersonate Microsoft products.

Even if you do pay to "unlock" the app, it won't do anything because your PC isn't actually infected with all that malware it "found".

Different brands of the rogues may modify various settings on your computer, end or close programs or system services, or block access to websites.

Onescan might use any of the following logos:

Find out ways that malware can get on your PC.  

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.

Remove programs

You might need to manually remove this program:

The entry name could be called "dasearch", "ddosclean", "anycop", or "pcvaccine".

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.