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Published Jun 30, 2011 | Updated Sep 15, 2017

JS/Tracur

Detected by Microsoft Defender Antivirus

Aliases: Win32/Kryptik (ESET) Sefnit (McAfee) W32/Vundo (Norman) Win32.Genome (Kaspersky) Trojan.Alyak (Rising AV) Trojan.Click (Dr.Web) TROJ_TRACUR (Trend Micro)

Summary

Windows Defender detects and removes this threat.

This family of threats are malicious JavaScript files that redirect your web searches.  

They do this to earn revenue for the malware authors via online advertisement fraud. The threats hijack search result links from the following search engines, and redirect you to a different webpage:

  • Alltheweb
  • Altavista
  • AOL
  • Ask
  • Bing
  • Gigablast
  • Google
  • Hotbot
  • Lycos
  • Netscape
  • Snap
  • Yahoo
  • Youtube

They can be installed by other malware, including members of the Win32/Tracur description for more information.

Find out ways that malware can get on your PC.  

Use the following free Microsoft software to detect and remove this threat:

You should also run a full scan. A full scan might find other, hidden malware.

Remove browser add-ons

You may need to remove add-ons from your browser:

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:

For Windows 8.1 :

  1. 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.
  2. In the left pane, tap or click Allow an app or feature through Windows Firewall.
  3. Tap or click Change settings. You might be asked for an admin password or to confirm your choice.
  4. 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:

  1. Click Start, select Control Panel, then System and Security.
  2. Select Windows Firewall.
  3. On the menu on the left, select Allow a program through Windows Firewall. If you're prompted, type the password or provide confirmation.
  4. Click Change Settings. If you're prompted, type the password or provide confirmation.
  5. Select <program name> from the list of allowed programs and features. Click Remove.
  6. Click OK.

For Windows Vista:

  1. Click Start, select Control Panel, then Security Center.
  2. On the menu on the left, select Windows Firewall.
  3. On the menu on the left, select Allow a program through Windows Firewall. If you are prompted, type the password or provide confirmation.
  4. Select <program name> from the list of allowed programs and features. Click Delete.
  5. Click OK.
Get more help

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

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

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