Avast finds a virus but only once.

From: "Michel S." <NoSpam.RemoveThis@msn.com>

| Hi !
|
| I'm using Avast Home 4.7 - XP-Pro sp2
|
| I received a .zip file containing an executable file. If I unzip and
| execute the file, Avast reports that the file
| "C:\Windows\System32\directx.exe" (which is not the name of the file in
| the archive but seems installed by that file) contains the
| Win32:Bropia-AQ worm. I selected to "quarantine" that file - so far so
| good.
|
| What worries me is that if I perform the same operation again (unzip
| and execute), I no longer get any virus message. This happens either
| immediately or after a reboot.
|
| I verified in the administration tools that all four Avast services
| were still running and set to automatic. Same thing in the processes
| list in task manager.
|
| I also performed a McAfee online scan, but nothing was found.
|
| I copied the .zip file to another test machine, and the same thing
| happens.
|
| How can this be explained ?
|
| Any suggestions ?
|
| Thanks
|

The real question is what are you doing executing malware that was sent to you in a ZIP file
?

The other question is why doesn't Avast catch this when the file is extracted from the ZIP
file or from within the ZIP file ?

You idicate that AFTER you execute the attachment, Avast alets on
"C:\Windows\System32\directx.exe". Sounds like it already infected the PC !

Please submit a sample to "directx.exe" Virus Total --
http://www.virustotal.com/flash/index_en.html
The submission will then be tested against many different AV vendor's scanners.
That will give you an idea what it is and who recognizes it. In addition, unless told
otherwise, Virus Total will provide the sample to all participating vendors.

You can also submit a suspect, one at a time, via the following email URL...
mailto:scan@virustotal.com?subject=SCAN

When you get the report, please post back the exact results.


I suggest you use ANOTHER AV scanner to disinfect the PCs you most likely infected.

Download MULTI_AV.EXE from the URL --
http://www.ik-cs.com/programs/virtools/Multi_AV.exe

To use this utility, perform the following...
Execute; Multi_AV.exe { Note: You must use the default folder C:\AV-CLS }
Choose; Unzip
Choose; Close

Execute; C:\AV-CLS\StartMenu.BAT
{ or Double-click on 'Start Menu' in C:\AV-CLS }

NOTE: You may have to disable your software FireWall or allow WGET.EXE to go through your
FireWall to allow it to download the needed AV vendor related files.

C:\AV-CLS\StartMenu.BAT -- { or Double-click on 'Start Menu' in C:\AV-CLS}
This will bring up the initial menu of choices and should be executed in Normal Mode.
This way all the components can be downloaded from each AV vendor's web site.
The choices are; Sophos, Trend, McAfee, Kaspersky, Exit this menu and Reboot the PC.

You can choose to go to each menu item and just download the needed files or you can
download the files and perform a scan in Normal Mode. Once you have downloaded the files
needed for each scanner you want to use, you should reboot the PC into Safe Mode [F8 key
during boot] and re-run the menu again and choose which scanner you want to run in Safe
Mode. It is suggested to run the scanners in both Safe Mode and Normal Mode.

When the menu is displayed hitting 'H' or 'h' will bring up a more comprehensive PDF help
file. http://www.ik-cs.com/multi-av.htm

Additional Instructions:
http://pcdid.com/Multi_AV.htm


* * * Please report back your results * * *


--
Dave
http://www.claymania.com/removal-trojan-adware.html
http://www.ik-cs.com/got-a-virus.htm
 >> Stay informed about: Avast finds a virus but only once. 

From: "Michel S." <NoSpam.TakeThisOut@msn.com>

| David H. Lipman a couché sur son écran :
|
| Thanks for your reply. I'll perform the suggested tests on an image
| containing the zipped file as well as with the extrated (but
| unexecuted) .exe file.
|
| So far, I can tell you that Trend Micro found nothing.
|
>> The real question is what are you doing executing malware that was sent to
>> you in a ZIP file ?
|
| Testing if it was safe or not.
|
| When in doubt, I always do this kind of operation on a "test" machine
| with a fresh ghosted (clean) image.
|
>> I suggest you use ANOTHER AV scanner to disinfect the PCs you most likely
>> infected.
>>
| As I said in my OP, I did that with McAfee online scanner - which found
| nothing.
|
>> The other question is why doesn't Avast catch this when the file is extracted
>> from the ZIP file or from within the ZIP file ?
>>
| I copied the zip file to another machine running NAV 2004, and it did
| the same (ie: found nothing). Since it is a production machine, I did
| not execute the file.
|
| Thanks again,
| Later
|

I want to see the Virus Total report. Please perform ASAP.

--
Dave
http://www.claymania.com/removal-trojan-adware.html
http://www.ik-cs.com/got-a-virus.htm
 >> Stay informed about: Avast finds a virus but only once.