BleepingComputer.com: Interpreting GMER Results

My brother has a problem on his Windows XP SP3 Desktop.

He picked up Windows Fake alert virus a few days ago. We have used MBAM to remove the virus and UNHIDE to restore hidden folders. Generally the PC seem to run OK and MBAM does not detect any problems.

However, his PC is now occasionally giving blue screens. I've use WinDbg to interpret the minidump files and they seem to point at nv4_disp.dll. We reinstalled the graphics adaptor driver but that has not fixed the problem.

I've just run GMER and the results are below. Do these point to nv4_mini.sys, sunkfilt.sys and nv4_disp.sys being infected? and if so how do I go about replacing them?

Stan




0.15.15641 - http://www.gmer.net
Rootkit scan 2011-07-22 13:01:03
Windows 5.1.2600 Service Pack 3 Harddisk0\DR0 -> \Device\Ide\IdeDeviceP0T0L0-3 Maxtor_4R080L0 rev.RAMC1TU0
Running: kwvjklqk[1].exe; Driver: C:\DOCUME~1\JVCHRI~1\LOCALS~1\Temp\ufpyauog.sys


---- Kernel code sections - GMER 1.0.15 ----

.text C:\WINDOWS\system32\DRIVERS\nv4_mini.sys section is writeable [0xF81EB340, 0xFFF3F, 0xF8000020]
init C:\WINDOWS\System32\Drivers\sunkfilt.sys entry point in "init" section [0xF88972E0]
.text C:\WINDOWS\System32\nv4_disp.dll section is writeable [0xBF012300, 0x234A20, 0xF8000020]

---- User code sections - GMER 1.0.15 ----

.text C:\Program Files\Internet Explorer\iexplore.exe[2644] USER32.dll!DialogBoxParamW 7E4247AB 5 Bytes JMP 3E2154C5 C:\WINDOWS\system32\IEFRAME.dll (Internet Explorer/Microsoft Corporation)
.text C:\Program Files\Internet Explorer\iexplore.exe[2644] USER32.dll!CreateWindowExW 7E42D0A3 5 Bytes JMP 3E2EDB04 C:\WINDOWS\system32\IEFRAME.dll (Internet Explorer/Microsoft Corporation)
.text C:\Program Files\Internet Explorer\iexplore.exe[2644] USER32.dll!DialogBoxIndirectParamW 7E432072 5 Bytes JMP 3E3E5329 C:\WINDOWS\system32\IEFRAME.dll (Internet Explorer/Microsoft Corporation)
.text C:\Program Files\Internet Explorer\iexplore.exe[2644] USER32.dll!MessageBoxIndirectA 7E43A082 5 Bytes JMP 3E3E525B C:\WINDOWS\system32\IEFRAME.dll (Internet Explorer/Microsoft Corporation)
.text C:\Program Files\Internet Explorer\iexplore.exe[2644] USER32.dll!DialogBoxParamA 7E43B144 5 Bytes JMP 3E3E52C6 C:\WINDOWS\system32\IEFRAME.dll (Internet Explorer/Microsoft Corporation)
.text C:\Program Files\Internet Explorer\iexplore.exe[2644] USER32.dll!MessageBoxExW 7E450838 5 Bytes JMP 3E3E512C C:\WINDOWS\system32\IEFRAME.dll (Internet Explorer/Microsoft Corporation)
.text C:\Program Files\Internet Explorer\iexplore.exe[2644] USER32.dll!MessageBoxExA 7E45085C 5 Bytes JMP 3E3E518E C:\WINDOWS\system32\IEFRAME.dll (Internet Explorer/Microsoft Corporation)
.text C:\Program Files\Internet Explorer\iexplore.exe[2644] USER32.dll!DialogBoxIndirectParamA 7E456D7D 5 Bytes JMP 3E3E538C C:\WINDOWS\system32\IEFRAME.dll (Internet Explorer/Microsoft Corporation)
.text C:\Program Files\Internet Explorer\iexplore.exe[2644] USER32.dll!MessageBoxIndirectW 7E4664D5 5 Bytes JMP 3E3E51F0 C:\WINDOWS\system32\IEFRAME.dll (Internet Explorer/Microsoft Corporation)
.text C:\Program Files\Internet Explorer\iexplore.exe[2940] USER32.dll!DialogBoxParamW 7E4247AB 5 Bytes JMP 3E2154C5 C:\WINDOWS\system32\IEFRAME.dll (Internet Explorer/Microsoft Corporation)
.text C:\Program Files\Internet Explorer\iexplore.exe[2940] USER32.dll!SetWindowsHookExW 7E42820F 5 Bytes JMP 3E2E9A91 C:\WINDOWS\system32\IEFRAME.dll (Internet Explorer/Microsoft Corporation)
.text C:\Program Files\Internet Explorer\iexplore.exe[2940] USER32.dll!CallNextHookEx 7E42B3C6 5 Bytes JMP 3E2DD0CD C:\WINDOWS\system32\IEFRAME.dll (Internet Explorer/Microsoft Corporation)
.text C:\Program Files\Internet Explorer\iexplore.exe[2940] USER32.dll!CreateWindowExW 7E42D0A3 5 Bytes JMP 3E2EDB04 C:\WINDOWS\system32\IEFRAME.dll (Internet Explorer/Microsoft Corporation)
.text C:\Program Files\Internet Explorer\iexplore.exe[2940] USER32.dll!UnhookWindowsHookEx 7E42D5F3 5 Bytes JMP 3E25466E C:\WINDOWS\system32\IEFRAME.dll (Internet Explorer/Microsoft Corporation)
.text C:\Program Files\Internet Explorer\iexplore.exe[2940] USER32.dll!DialogBoxIndirectParamW 7E432072 5 Bytes JMP 3E3E5329 C:\WINDOWS\system32\IEFRAME.dll (Internet Explorer/Microsoft Corporation)
.text C:\Program Files\Internet Explorer\iexplore.exe[2940] USER32.dll!MessageBoxIndirectA 7E43A082 5 Bytes JMP 3E3E525B C:\WINDOWS\system32\IEFRAME.dll (Internet Explorer/Microsoft Corporation)
.text C:\Program Files\Internet Explorer\iexplore.exe[2940] USER32.dll!DialogBoxParamA 7E43B144 5 Bytes JMP 3E3E52C6 C:\WINDOWS\system32\IEFRAME.dll (Internet Explorer/Microsoft Corporation)
.text C:\Program Files\Internet Explorer\iexplore.exe[2940] USER32.dll!MessageBoxExW 7E450838 5 Bytes JMP 3E3E512C C:\WINDOWS\system32\IEFRAME.dll (Internet Explorer/Microsoft Corporation)
.text C:\Program Files\Internet Explorer\iexplore.exe[2940] USER32.dll!MessageBoxExA 7E45085C 5 Bytes JMP 3E3E518E C:\WINDOWS\system32\IEFRAME.dll (Internet Explorer/Microsoft Corporation)
.text C:\Program Files\Internet Explorer\iexplore.exe[2940] USER32.dll!DialogBoxIndirectParamA 7E456D7D 5 Bytes JMP 3E3E538C C:\WINDOWS\system32\IEFRAME.dll (Internet Explorer/Microsoft Corporation)
.text C:\Program Files\Internet Explorer\iexplore.exe[2940] USER32.dll!MessageBoxIndirectW 7E4664D5 5 Bytes JMP 3E3E51F0 C:\WINDOWS\system32\IEFRAME.dll (Internet Explorer/Microsoft Corporation)
.text C:\Program Files\Internet Explorer\iexplore.exe[2940] ole32.dll!CoCreateInstance 774FF1AC 5 Bytes JMP 3E2EDB60 C:\WINDOWS\system32\IEFRAME.dll (Internet Explorer/Microsoft Corporation)
.text C:\Program Files\Internet Explorer\iexplore.exe[2940] ole32.dll!OleLoadFromStream 7752981B 5 Bytes JMP 3E3E5691 C:\WINDOWS\system32\IEFRAME.dll (Internet Explorer/Microsoft Corporation)

---- Devices - GMER 1.0.15 ----

AttachedDevice \FileSystem\Fastfat \Fat fltmgr.sys (Microsoft Filesystem Filter Manager/Microsoft Corporation)

---- EOF - GMER 1.0.15 ----

I don't see any bad things there.

I'd like us to scan your machine with ESET OnlineScan

• Hold down Control and click on the following link to open ESET OnlineScan in a new window.
  ESET OnlineScan
  
• Click the button.
  
• For alternate browsers only: (Microsoft Internet Explorer users can skip these steps)
  • Click on to download the ESET Smart Installer. Save it to your desktop.
    
  • Double click on the icon on your desktop.
  
  
• Check
  
• Click the button.
  
• Accept any security warnings from your browser.
  
• Under scan settings, check and check Remove found threats
  
• Click Advanced settings and select the following:
  • Scan potentially unwanted applications
    
  • Scan for potentially unsafe applications
    
  • Enable Anti-Stealth technology
  
  
• ESET will then download updates for itself, install itself, and begin scanning your computer. Please be patient as this can take some time.
  
• When the scan completes, push
  
• Push , and save the file to your desktop using a unique name, such as ESETScan. Include the contents of this report in your next reply.
  
• Push the button.
  
• Push

NOTE: In some instances if no malware is found there will be no log produced.

Many thanks for the reply. My brother is now away for a couple of weeks but we'll do the scan on his return and post the results.

Ok we'll keep this open.

The PC was crashing more and more often. My brother has bought a new laptop and he's transferred his data files. I'll reinstall windows on the PC when I next visit later this year. So for the momment please close this topic and many thanks for your help.

Not an unwise decision to make. In some instances an infection may have caused so much damage to your system that it cannot be completely cleaned or repaired. Wiping your drive, reformatting, and performing a clean install of the OS or doing a factory restore removes everything and is the safest action but I cannot make that decision for you.

Reformatting a hard disk deletes all data. If you decide to reformat, you can back up all your important documents, data files and photos. The safest practice is not to backup any autorun.ini or .exe files because they may be infected. Some types of malware may disguise itself by adding and hiding its extension to the existing extension of files so be sure you take a close look at the full name. After reformatting, as a precaution, make sure you scan these files with your anti-virus prior to copying them back to your hard drive.



Caution: If you are considering backing up data and reformatting, keep in mind, with a Virut infection, there is always a chance of backed up data reinfecting your system. If the data is that important to you, then you can try to salvage some of it but there is no guarantee so be forewarned that you may have to start over again afterwards if reinfected by attempting to recover your data. Only back up your important documents, personal data files, photos to a CD or DVD drive, not a flash drive or external hard drive as they may become compromised in the process. The safest practice is not to backup any executable files (*.exe), screensavers (*.scr), autorun (.ini) or script files (.php, .asp, .htm, .html, .xml ) files because they may be infected by malware. Avoid backing up compressed files (.zip, .cab, .rar) that have executables inside them as some types of malware can penetrate compressed files and infect the .exe files within them. Other types of malware may even disguise itself by hiding a file extension or adding to the existing extension as shown here (click Figure 1 to enlarge) so be sure you look closely at the full file name. If you cannot see the file extension, you may need to reconfigure Windows to show file name extensions. Then make sure you scan the backed up data with your anti-virus prior to to copying it back to your hard drive.

If your CD/DVD drive is unusable, another word of caution if you are considering backing up to an external usb hard drive as your only alternative. External drives are more susceptible to infection and can become compromised in the process of backing up data. I'm not saying you should not try using such devices but I want to make you aware of all your options and associated risks so you can make an informed decision if its worth that risk.

• How and Where to backup your files in XP or Vista
  
• How to Backup and Restore in Windows 7
  
• How to use Ubuntu Live CD to Backup Files from your dead Windows Computer

Again, do not back up any files with the following file extensions: exe, .scr, .ini, .htm, .html, .php, .asp, .xml, .zip, .rar, .cab as they may be infected.

If you're not sure how to reformat or need help with reformatting, please review:

• How to partition and format a hard disk in Windows XP
  
• Prepping for a Clean Install Windows XP.

These links include step-by-step instructions with screenshots:

• XP Clean Install Interactive Setup
  
• How to reformat your computer in case of a severe malware infection
  
• Reformat & Clean Install Windows XP

Vista users can refer to these instructions:

• Windows Vista Clean Install
  
• How to Do a Clean Install and Setup with a Full Version of Vista
  
• How to Do a Clean Install with a Upgrade Version of Vista

Don't forget you will have to go to Microsoft Update and apply all Windows security patches after reformatting.

Note: If you're using an IBM, Sony, HP, Compaq or Dell machine, you may not have an original XP CD Disk. By policy Microsoft no longer allows OEM manufactures to include the original Windows XP CD-ROM on computers sold with Windows preinstalled. Instead, most computers manufactured and sold by OEM vendors come with a vendor-specific Recovery Disk or Recovery Partition for performing a clean "factory restore" that will reformat your hard drive, remove all data and restore the computer to the state it was in when you first purchased it. See Technology Advisory Recovery Media. If the recovery partition has become infected, you will need to contact the manufacturer, explain what happened and ask them to send full recovery disks to use instead..

If you need additional assistance with reformatting or partitioning, you can start a new topic in the Operating Systems Subforums forum.