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Win32/Defmid
Aliases: Security Central (other) Antimalware Tool (other) Antivirus Center (other) Antivirus Pro (other) Internet Defender (other) Internet Protection (other) Security Defender 2011 (other) System Defender (other) Trojan.Win32.FakeAV.atuz (Kaspersky) W32/FakeAlert.CJWW (Norman) FakeAV.KKM (AVG) TROJ_FAKEALER.FR (Trend Micro) TR/FakeAV.atuz (Avira) Trojan.FakeAV (Ikarus) Trojan.Downloader.NSIS.FakeAlert.C (BitDefender) FakeAlert.a (McAfee) Security Center (other) Security Defender (other)
Summary
Windows Defender Antivirus detects and removes this threat.
Rogue:Win32/Defmid is a trojan that mimics security alerts and displays messages requesting the user to purchase the rogue to fix "detected" problems that in actuality don't exist.
you can find out more about rogues from our Rogue information page.
The following free Microsoft software detects and removes this threat:
- Microsoft Defender Antivirus for Windows 10 and Windows 8.1, or Microsoft Security Essentials for Windows 7 and Windows Vista
- Microsoft Safety Scanner
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.
Remove program exceptions in the firewall
This threat might add itself to your Windows Firewall exception list. This means it can go online without being blocked. To remove it from the exception list, do the following:
- Open Windows Firewall by swiping in from the right edge of the screen, tapping Search (or if you're using a mouse, pointing to the upper-right corner of the screen, moving the mouse pointer down, and then clicking Search), entering firewall in the search box, tapping or clicking Settings, and then tapping or clicking Windows Firewall.
- In the left pane, tap or click Allow an app or feature through Windows Firewall.
- Tap or click Change settings. You might be asked for an admin password or to confirm your choice.
- Select the check box next to the app you want to allow, select the network types you want to allow communication on, and then click OK.
For Windows 7:
- Click Start, select Control Panel, then System and Security.
- Select Windows Firewall.
- On the menu on the left, select Allow a program through Windows Firewall. If you're prompted, type the password or provide confirmation.
- Click Change Settings. If you're prompted, type the password or provide confirmation.
- Select <program name> from the list of allowed programs and features. Click Remove.
- Click OK.
For Windows Vista:
- Click Start, select Control Panel, then Security Center.
- On the menu on the left, select Windows Firewall.
- On the menu on the left, select Allow a program through Windows Firewall. If you are prompted, type the password or provide confirmation.
- Select <program name> from the list of allowed programs and features. Click Delete.
- Click OK.
Additional remediation instructions for this threat
This threat might make lasting changes to your PC's settings that won't be restored when it's cleaned. The following steps can help change these settings back to what you want:
- Restore my system registry:
- For Windows 7
- For Windows Vista
- Restore security settings to a known working state
- Reset Internet Explorer settings
- Delete the contents of the Temporary Internet Files folder
- For other support and help related articles, go to:
- Microsoft Security TechNet Center