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Published Dec 02, 2011 | Updated Sep 15, 2017

Trojan:Win32/Sefnit.AC

Detected by Microsoft Defender Antivirus

Aliases: Win32/Sefnit.CC trojan (ESET) Sefnit.c (McAfee) Troj/Sefnit-T (Sophos) Trojan.Sefnit (Symantec) TROJ_SPNR.16LB11 (Trend Micro)

Summary

Trojan:Win32/Sefnit.AC is a trojan that may monitor Internet Explorer and Mozilla Firefox to hijack search results from certain engines.

To detect and remove this threat and other malicious software that may be installed on your computer, run a full-system scan with an appropriate, up-to-date, security solution. The following Microsoft products detect and remove this threat:

For more information on antivirus software, see http://www.microsoft.com/windows/antivirus-partners/.

Update vulnerable Java applications

This threat exploits a vulnerability in Java. After removing this threat, make sure that you install updates made available from the vendor. You can read more about where to download the software update from the following link:

It may be necessary to remove older versions of Java that are still present. Keeping old and unsupported versions of Java on your system presents a serious security risk. To read more about why you should remove older versions of Java, see the following information.

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