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IDE driver changes name at every boot.  Virus ?

Posted on 2010-11-18
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Last Modified: 2012-06-22
Hello,

Having some problems with my XP SP3 system, I have started investigating in depth the boot process.
I have the /BOOTLOG enabled for years on my system.
This logs some boot details in the %windir%/ntbtlog.txt file.
I therefore started to look if I couldnt find any weird driver name in that file.
I actually found one :
            Loaded driver \SystemRoot\System32\Drivers\ausdht7g.SYS
I looked in my system32/drivers directory for the file but didn't find it.
I therefore looked more deeply and found that this driver changes name at every reboot, since December 2006, date at which it started appearing.
Running DriverView from Nirsoft shows that the driver is loaded and is listed as IDE/ATAPI Port Driver, 5.1.2600.5512 (xpsp.080413-2108), Microsoft Corporation, Microsoft® Windows® Operating System.

Here are the relevant lines from the ntbtlog.txt file, showing the names used for this driver :

+ egrep 'Service Pack|\\a.......\.SYS' ntbtlog3.txt
 Service Pack 1 9 21 2004 23:37:59.375
 Service Pack 1 9 21 2004 23:43:03.375
 Service Pack 1 9 21 2004 23:55:11.375
 Service Pack 1 9 22 2004 10:37:54.375
 Service Pack 1 9 22 2004 12:12:25.359
 Service Pack 1 9 22 2004 14:16:00.375
 Service Pack 1 9 22 2004 14:50:32.375
 Service Pack 1 9 22 2004 14:55:32.359
 Service Pack 1 9 22 2004 15:07:57.375
 Service Pack 1 9 22 2004 15:14:52.375
 Service Pack 1 9 22 2004 15:19:52.375
 Service Pack 1 9 22 2004 15:37:17.375
 Service Pack 1 9 22 2004 15:48:45.375
 Service Pack 1 9 23 2004 00:54:29.375
 Service Pack 1 9 23 2004 22:38:07.375
 Service Pack 1 9 27 2004 19:47:06.375
 Service Pack 1 9 30 2004 23:20:12.359
 Service Pack 110  4 2004 19:50:22.375
......... removed lines ...................
 Service Pack 111 30 2006 11:28:20.375
 Service Pack 112  2 2006 13:38:25.375
 Service Pack 112  2 2006 19:57:22.375
Loaded driver \SystemRoot\System32\Drivers\av8k5o1x.SYS
 Service Pack 112  5 2006 09:04:56.375
Loaded driver \SystemRoot\System32\Drivers\abn1c3w1.SYS
 Service Pack 112  8 2006 01:44:51.375
Loaded driver \SystemRoot\System32\Drivers\a3i8gtoc.SYS
 Service Pack 112  8 2006 09:56:31.375
Loaded driver \SystemRoot\System32\Drivers\ai2p9vf3.SYS
 Service Pack 112 10 2006 17:49:37.375
Loaded driver \SystemRoot\System32\Drivers\alk546a6.SYS
 Service Pack 112 11 2006 07:48:15.375
Loaded driver \SystemRoot\System32\Drivers\ad7z7kj2.SYS
 Service Pack 112 16 2006 14:19:10.375
Loaded driver \SystemRoot\System32\Drivers\appa9qnt.SYS
 Service Pack 112 16 2006 14:22:06.375
Loaded driver \SystemRoot\System32\Drivers\akrh9cbk.SYS
 Service Pack 112 16 2006 14:32:09.375
Loaded driver \SystemRoot\System32\Drivers\as4z7wv3.SYS
 Service Pack 112 16 2006 15:53:29.375
Loaded driver \SystemRoot\System32\Drivers\a4kd3tp5.SYS
 Service Pack 112 16 2006 16:19:45.375
Loaded driver \SystemRoot\System32\Drivers\aa093efi.SYS
 Service Pack 112 18 2006 00:35:58.375
Loaded driver \SystemRoot\System32\Drivers\ayr26ro8.SYS
..........  removed lines ...................
Loaded driver \SystemRoot\System32\Drivers\awbvgwq8.SYS
 Service Pack 311 16 2010 19:34:43.375
Loaded driver \SystemRoot\System32\Drivers\akuf1rvi.SYS
 Service Pack 311 16 2010 20:35:10.375
Loaded driver \SystemRoot\System32\Drivers\axkel46g.SYS
 Service Pack 311 18 2010 14:54:04.375
Loaded driver \SystemRoot\System32\Drivers\a6z2qu01.SYS
 Service Pack 311 19 2010 01:03:38.359
Loaded driver \SystemRoot\System32\Drivers\ausdht7g.SYS

Of course I ran a full scan of my C drive and no virus was found.
I tried to find any weird program which would have been installed at that date, but didn't see anything weird.

Any idea where this strange behaviour is coming from ?

Thanks in advance.

Michel
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Question by:michelhans
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7 Comments
 
LVL 48

Expert Comment

by:dbrunton
ID: 34169804
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Author Comment

by:michelhans
ID: 34169955
Ran TDSSKiller, which only pointed to sptd.sys, which is the Alcohol 120% Virtual CD driver.  I removed it temporarily.
Note that in the report, TDSS did not list the questionnable driver, although it is listed in the registry.

Running Malware.
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Author Comment

by:michelhans
ID: 34170053
Hitman pro and MalwareBytes done, with no significant discovery.  Will reboot anyway for the small changes.  Note that Combofix requires Antivirus to be uninstalled, which I do not want to do.  
Will keep posted.
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LVL 48

Expert Comment

by:dbrunton
ID: 34170081
What anti-virus are you running?

I'm just wondering if this is an anti-virus file.
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Accepted Solution

by:
dbrunton earned 400 total points
ID: 34170101
You've actually fixed the problem.  

It is sptd.sys

Full details here http://www.bleepingcomputer.com/forums/topic203985.html

Looks like Daemon Tools or Alcohol.
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Assisted Solution

by:Tolomir
Tolomir earned 100 total points
ID: 34170925
I guess this random name is used to fool some games music CDs that the "copyright breaker" is installed.
If it were sptd.sys all the time one could easily identify such a tool.
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Author Comment

by:michelhans
ID: 34172305
Ok.  So, this is explained.  No threat there.    I downloaded the latest version of Alcohol and reinstalled.


@tolomir : I actually contacted Alcohol Soft and they confirmed it is to fool the copyright protections.

@dbrunton : The antivirus I'm running is McAfee Enterprise 8.5i.

I'm surprised that none of the 3 malware detectors noticed the 'hidden' driver.

Thanks all for your help.
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