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ComboFix Freezes at start of Malware Check


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#1 risu

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Posted 31 October 2011 - 02:28 PM

The program has run well in past for me on several computers. But now when I apply it after a fresh restore of the entire XP OS, it locks at the time of malware check, and PC can only be hard boot restarted. Never gets past Malware check. No log is created. Cursor stops blinking on freeze up. (Feels like a RAM filler type block.)

I suspect a hidden HDD partition of perhaps 2 gigs that kills OS if combofix attempts to complete.

RISU

Edited by Orange Blossom, 31 October 2011 - 10:44 PM.
Moved to AV forum. ~ OB


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#2 Union_Thug

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Posted 01 November 2011 - 07:17 AM

Why are u running ComboFix? ...on a fresh install, no less?

Just curious to know is all. :)

#3 quietman7

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Posted 01 November 2011 - 08:32 AM

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 (i.e. stalling, hanging, crashing) 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. Using this tool incorrectly could lead to disastrous problems with your operating system such as preventing it from ever starting again.

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. 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. In such cases, it is helpful to know at what stage CF stalled/crashed and to provide that information to the Helper who is assisting you so they can investigate. This is just another reason why you should only use ComboFix under supervision.

If you need assistance with a malware infection, please read the "Preparation Guide".
  • If you cannot complete a step, then skip it and continue with the next.
  • In Step 7 there are instructions for downloading and running DDS which will create a Pseudo HJT Report as part of its log.
  • When you have done that, post your log in the Virus, Trojan, Spyware, and Malware Removal Logs forum, NOT here, for assistance by the Malware Response Team Experts.
If you do not need assistance with malware removal, then you should not be using ComboFix just to see what it finds. 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.
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