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Combofix Question


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#1 USN Vet

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Posted 12 June 2011 - 07:36 AM

I ran Combofix Scan yesterday, not because I thought I was infected, but to see what is contained in the output log.The notify, when you first start says duration approx 10 minutes, but much longer for heavily infected machine.

So when it kept running and running I started to get a little aprehensive. Went thru Stage-50 some and ran for about an hour. It looks like it was working on the 163K plus urls contained in the Hostsman application, as when I rebooted, there was but one left. I reviewed the log file but did not see any file or folder deletes, except for a few folders & files.

I guess this is normal procedure for Combofix ? Any way to exclude Hostsman files ?
Feel free to ignore my comment, just another user !

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#2 quietman7

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Posted 13 June 2011 - 07:12 AM

If you ran run ComboFix just to see what it does or finds, please be aware that ComboFix was never meant to be used as a general purpose malware scanner like SuperAntispyware or Malwarebytes' Anti-Malware which scan individual drives or different folders on a computer for viruses.

As a general policy, Bleeping Computer does not offer advice on how to run ComboFix unless we asked someone to run it or if there is a problem with the computer caused by running the tool. This is because people should not be using ComboFix without being advised to do so by a trained expert (i.e. Malware Response Team) who is assisting a member deal a malware issue on that system. When issues arise due to complex malware infections, possible false detections, problems running ComboFix or with other security tools causing conflicts, experts are usually aware of them and can advise what should or should not be done while providing individual assistance. When false detections are identified, experts have access to the developer and can report them so he can investigate, confirm and make corrections. Those attempting to use ComboFix on their own do not have such information and are at risk when running the tool in an unsupervised environment.

Further, using ComboFix is only one part of the disinfection process. Preliminary scans from other tools like DDS, RSIT and GMER should be used first because they provide comprehensive logs with specific details about files, folders and registry keys which may have been modified by malware infection. Analysis of those logs allows planning an strategy for effective disinfection and a determination if using ComboFix is necessary. ComboFix was never meant to be used as a general purpose malware scanner like SuperAntispyware or Malwarebytes' Anti-Malware which scan individual drives or different folders on a computer for viruses. Please read the pinned topic ComboFix usage, Questions, Help? - Look here.

With that said, there are circumstances ComboFix will hang, crash or stall at various stages due to malware interference, failure to disable other real-time protection tools or the presence of CD Emulators (Daemon Tools, Alchohol 120%, Astroburn, AnyDVD) so that it does not complete successfully. Also, depending on how badly a system is infected, ComboFix may take longer to complete its routine than it normally does or fail to run properly. While that is not normal behavior, it is not unusual. This is just another reason why you should only use ComboFix under supervision.
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#3 USN Vet

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Posted 14 June 2011 - 01:38 AM

Thanks Quietman ! Your advice will be heeded henceforth !
Feel free to ignore my comment, just another user !

#4 quietman7

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Posted 14 June 2011 - 06:37 AM

You're welcome.

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