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Not detecting Malware
http://havp.hege.li/forum/viewtopic.php?f=3&t=408
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Author:  rafael [ 12 Jan 2009 05:48 ]
Post subject:  Not detecting Malware

I'm not able to block a malware that is downloaded via a php file.
The url is: http://www.oursouthernlakes.com/images/DSC01088.php
The downloaded file is not currently detected by clamav (I have submitted the sample do) but I created an UNOFFICIAL sig for it.
I'm able to detect the malware with clamscan:
clamdscan DSC01010.scr
DSC01010.scr: DSC01010.scr.UNOFFICIAL FOUND

----------- SCAN SUMMARY -----------
Infected files: 1
Time: 0.096 sec (0 m 0 s)

Author:  hege [ 12 Jan 2009 08:05 ]
Post subject:  Re: Not detecting Malware

Did you reload HAVP with SIGHUP? Does it help if you restart it completely?

Author:  rafael [ 12 Jan 2009 13:33 ]
Post subject:  Re: Not detecting Malware

I restarted clamav and havp. If you have the time you can try to reproduce the situation, the malware is still there.

Author:  rafael [ 13 Jan 2009 04:27 ]
Post subject:  Re: Not detecting Malware

This is strange. I'm doing something wrong that I can't figure out.
From the logs:
12/01/2009 09:07:29 10.10.203.4 GET 200 http://www.uniferblog.com/DSC01010.scr 531+205312 VIRUS ClamAV: DSC01010.scr.UNOFFICIAL
12/01/2009 09:07:40 10.10.203.4 GET 200 http://www.uniferblog.com/DSC01010.scr 421+205312 VIRUS ClamAV: DSC01010.scr.UNOFFICIAL
12/01/2009 09:08:12 10.10.203.4 GET 200 http://www.uniferblog.com/DSC01010.scr 421+205312 VIRUS ClamAV: DSC01010.scr.UNOFFICIAL
12/01/2009 09:08:15 10.10.203.4 GET 200 http://www.uniferblog.com/DSC01010.scr 421+205312 VIRUS ClamAV: DSC01010.scr.UNOFFICIAL

These generated by someone in the network (who received an email with links to the malware)

So havp is detecting and blocking, but I can still download it, when other malware that I have for testing is blocked.

Author:  hege [ 14 Jan 2009 10:09 ]
Post subject:  Re: Not detecting Malware

Familiarize yourself with how KEEPBACKBUFFER setting works.. :)

Author:  rafael [ 14 Jan 2009 15:08 ]
Post subject:  Re: Not detecting Malware

I found the problem. I was creating the signature with
sigtool --md5 DSC01010.scr

They are changing the file over time, the md5 created now is differrent from the original.

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