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What to do if my computer is infected by a virus or a malware?

Hi all,

My computer is acting funny lately, some symtoms: clicking things feels different. Normally I could doubleclick in chrome to select the whole URL, now I have to use CTRL-A to do that. I get the feeling something is messing with the things I select/ doubleclick. Double clicking folders doesn't open them anymore.

I have a folder on my D drive called 12bc0e0ac5b89191efaea8 with two files in it: setup.exe and setup.rll. I can't delete them, it says I don't have permission while i'm admin.

I tried Housecall from trendmicro. I couldn't select the 'I agree' tickbox with the mouse, had to use tab and spacebar, then I could not click next. I have AVG Free, it does not detect anything. That I find strange too, because usually it would find a few tracking cookies etc. Now, nothing, ever.

All in all I think I cought something, do you guys know of a way to check if I have and how to remove? I would hate to reinstall all I have on this box. Please advise,

Thanks in advance,

Gert-Jan

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marked as duplicate by Mehper C. Palavuzlar, Ƭᴇcʜιᴇ007, Moab, ChrisF, Majenko Apr 24 '11 at 15:29

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2 Answers 2

Generally speaking without more detailed information - which you seem to have troubles with in the first place, due to blocked options - it's tough to nail it down into a more specific direction.

For general help identifying what could be wrong, try installing/running the following software:

  • HijackThis from TrendMicro - there's a non-installer download and you can save the logfile, could you post it so we can have a look?
  • MalwareBytes Anti-Malware - See whether that finds something on your machine.
  • ClamWin AV - A lot of stuff which has code to block/disable/hidefrom antivirus software seems to "forget" about this. It's a pure on-demand scanner and runs ages for me, but it has helped in a few situations.
  • You could try the bootable scanner-CD from AVG, if there's something blocking AVG from properly scanning it should work if you boot from this.
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Thanks, working through the list, it found some already. –  gjvdkamp Apr 23 '11 at 10:45
    
Hi do you think it's possible that some infection messes with antivirus? I'm not sure if this is possible at all. –  gjvdkamp Apr 23 '11 at 10:56
    
dds.scr is a better alternative to HJT in my opinion (it looks for more stuff and in more places) but lacks any function for removing. It's just a reporting tool. It's worth a look at the logs it creates, though. –  Andrew Lambert Apr 23 '11 at 11:15
    
@gjvdkamp - yes, some of the better written malware specifically targets AV etc. It's quite straightforward to do. –  Rory Alsop Apr 23 '11 at 12:35
    
Hmm, I ran all the tools described here, none of them found anything serious (Malwarebytes found adware and removed it). Can I now assume I'm safe? Is there anything else I can do to check if I have anything? –  gjvdkamp Apr 23 '11 at 12:57
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Our normal recommended application is Malware Bytes - use the free scanner to check your system out.

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When I try to download the free version I'm forwarded to MajorGeeks.com, that looks a bit funny.. is that normal? –  gjvdkamp Apr 23 '11 at 10:42
    
It may be a mirror used for storing the download files. I get sent to fileforum.betanews.com/detail/Malwarebytes-AntiMalware/… –  Majenko Apr 23 '11 at 10:50
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