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A colleague just visited a site which had been hacked by the JS/Alescurf.C trojan virus, which infects HTML via embedded JavaScript.

Windows PC's are infected by visiting the site.

If my colleague has Windows Essentials, which detected and removed the trojan, is there anything else that he needs to do to make sure the virus is no longer active?

Windows Essentials detected the trojan within seconds of visiting the site, and he's running a full system scan to see if it still detects anything.

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possible duplicate of Computer is infected by a virus or a malware, what do I do now? –  Moab Apr 6 '12 at 20:32
    
See my answer here on how to do an offline scan..superuser.com/questions/100360/… –  Moab Apr 6 '12 at 20:33

3 Answers 3

This signature is unknown to me and there is no trace of it in 5 largest definition databases. Are you sure that you typed it right?

In any case, your best bet would be a virus removal tool, I reccomend free utilities by kaspersky, they contain their latest virus definitions and a full scale antivirus engine:
http://www.kaspersky.com/virusscanner

P.S. Microsoft Essentials can't handle some of the viruses because lacks sophisticated security components, needed to catch them. If you don't want to run into such problems again, consider bying an industry standard endpoint software by either McAffee, Kaspersky or ESET.

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Sorry, I typed it wrong. Here is a description on Microsoft.com: Alescurf.C –  jmort253 Apr 7 '12 at 17:17
    
Thanks for the clarification. Yep, kaspersky will remove it. Signature was released on Jan 03 2012 22:05 GMT: securelist.com/en/descriptions/31202904/…; –  Temikus Apr 8 '12 at 17:58

A nice and clean scan with Malwarebytes Anti-Malware Free should work and check if everything is all right.

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Please, stop recommending Malwarebytes as an AntiVirus, it is by no means a real endpoint protection. While it can catch some of the most common Malware, it lacks the necessary i/o interception and network scanning to catch anything more serious. –  Temikus Apr 7 '12 at 12:58
    
I'm not recommending it as official antivirus, I'm saying to give a scan to be sure of something getting on the way. –  TweakFix Apr 9 '12 at 12:02

I recommend using Mcafee's Stinger and Microsoft's Malicious Software Removal tool which both are aimed at removing most of the in-the-wild viruses.

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