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Combofix false positive?


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#1 ZazaBB

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Posted 28 March 2011 - 09:17 AM

Greetings.

Today, 3/28/2011, I downloaded the latest ComboFix with a filesize of 4304820 and ran it.

I did so because of an unusual occurrence in my IE7 session which all of a sudden took me to Symantec's site saying something had interfered with my home page.

As I am a tech and this is my daily machine, it surprised me that anything should be amiss. I ran Malwarebytes and it did not find anything amiss, however, while scanning Symantec (Ver 10.0.1.1009) found and deleted a plugin for a security camera, dvrocxchs.dll and said it was a downloader trojan.

As this .dll has been on my machine for quite some time and while has been known to present false positives in the past, I decided to err on the side of caution. I downloaded and ran ComboFix as well.

Much to my surprise, it found a few "viruses", however they are all "sourceforge" type programs, which leads me to believe ComboFix has ID'd them incorrectly. Below is the log....

2011-03-28 13:17:07 . 2011-03-28 13:17:07 9,910 ----a-w- C:\Qoobox\Quarantine\Registry_backups\tcpip.reg
2011-03-28 13:12:29 . 2011-03-28 13:12:29 51 ----a-w- C:\Qoobox\Quarantine\catchme.log
2010-03-21 13:14:18 . 2010-01-22 06:46:50 214,528 ----a-w- C:\Qoobox\Quarantine\C\JDownloader\JDownloader.exe.vir
2010-02-15 12:36:15 . 2004-09-19 15:46:40 69,632 ----a-w- C:\Qoobox\Quarantine\C\NZB-O-Matic\NZB-O-Matic.exe.vir
2010-02-10 20:20:39 . 2009-05-24 19:25:42 912,384 ----a-w- C:\Qoobox\Quarantine\C\MP4CAM2AVI\Mp4Cam2AVI.exe.vir
2010-02-10 20:19:58 . 2008-07-20 01:54:46 970,752 ----a-w- C:\Qoobox\Quarantine\C\VirtualDub\VirtualDub.exe.vir

I compared the filesize and timestamp on the "affected" files and found them to be identical to the archive versions (rar'd) I have on my server.

Again running Malwarebytes, I allowed it to scan the qoobox files, and it found no problems. As I ran it prior to ComboFix, I would have thought if there was an issue, Malwarebytes or Symantec would have caught them.

My concern is that the latest ComboFix has a signature that is targeting possibly the compiler signature (?) that may be common to these programs?

Any and all thoughts, observation or advice are welcome.

Thank you!

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#2 myrti

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Posted 03 April 2011 - 08:58 AM

Hello and welcome to Bleeping Computer

We apologize for the delay in responding to your request for help. Here at Bleeping Computer we get overwhelmed at times, and we are trying our best to keep up. Please note that your topic was not intentionally overlooked. Our mission is to help everyone in need, but sometimes it takes just a little longer to get to every request for help. No one is ignored here.

If you have since resolved the original problem you were having, we would appreciate you letting us know. If not please perform the following steps below so we can have a look at the current condition of your machine.
If you are unable to create a log because your computer cannot start up successfully please provide detailed information about the Windows version you are using: What we in particular need to know is version, edition and if it is a 32bit or a 64bit system.
If you are unsure about any of these caracteristics, just let us know and we'll help you figuring it out. Please also tell us if you have your Windows CD/DVD handy.


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Even if you have already provided information about your PC, we need a new log to see what has changed since you originally posted your problem.
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In the upper right hand corner of the topic you will see a button called Watch Topic.I suggest you click it and select Immediate E-Mail notification and click on Proceed. This way you will be advised when we respond to your topic and facilitate the cleaning of your machine.

After 5 days if a topic is not replied to we assume it has been abandoned and it is closed.

regards myrti

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#3 ZazaBB

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Posted 03 April 2011 - 10:57 AM

Hi - Thanks for the reply.

It's been several days and new versions of ComboFix have since been posted.

I'd say the "freshness date" has been exceeded, so you can probably just close this thread.

If no other person has reported the same issue, I'll just chalk this up to an anomaly and move alone.

Again, thanks for the reply.

#4 myrti

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Posted 03 April 2011 - 02:19 PM

It appears that this issue is resolved, therefore I am closing the topic. If that is not the case and you need or wish to continue with this topic, please send me or any Moderator a Personal Message (PM) that you would like this topic re-opened.

is that a bird?  a plane? nooo it's the flying blueberry!

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