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Trojan Causing BSOD [RESOLVED]


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#1
powlaz

powlaz

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Hope you can help. Scanned my sister's PC on Housecall. Lucky her - it find 56 viruses. I was forced to install the drive as a slave into my PC. Housecall deleted all the files.

One of them was msudp4.sys which is a trojan that disguises itself as a system device. I can't boot into Safe Mode. I get the BSOD saying that this file is missing. I can't repair the installation using my Win2k Pro disc. The system needs to restart to get to the next step of the repair and I get the BSOD saying that this file: C:\winnt\system32\msudp4.sys is not found.

Here's the big question. How do I fix this? More specifically, how can I remove this "device" from my list of hardware so Windows isn't looking for something that shouldn't even be there in the first place.

If it helps - from Sophos:

------This section is for technical experts who want to know more.
Troj/Haxdoor-AG is a backdoor Trojan for the Windows platform.
Troj/Haxdoor-AG allows a remote attacker to run arbitrary commands. The Trojan may download and run further malicious code.
The Trojan uses stealthing techniques to avoid being terminated.
When Troj/Haxdoor-AG is installed the following files are created:
<System>\msudp4.sys
<System>\tcpG4T.dll
The file msudp4.sys provides stealthing functionality and has detected as Troj/Haxdor-Gen since version 3.93.
The following registry entries are created to run code exported by tcpG4T.dll on startup:
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\tcpG4T
DllName
tcpG4T.dll
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\tcpG4T
Startup
tcpG4T
HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\tcpG4T
Impersonate
1
The file msudp4.sys is registered as a new system driver service named "msudp4", with a display name of "UDPservice". Registry entries are created under:
HKLM\SYSTEM\CurrentControlSet\Services\msudp4\



Thanks for the help,

Matt
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#2
tampabelle

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Hi,


We are sorry to have missed your log due to heavy traffic.

If you still need help, please post back a fresh Hijack This log.

If the problem has been resolved, please let us know.
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#3
powlaz

powlaz

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Hi,

I didn't post a log. Can't get into Windows to give you one. Wound up formatting the hard drive and starting from scratch. Gave me a chance to experiment with unattended installations.

Was really hoping to learn how to disable a device driver. That's what this trojan did. It disguised itself as a device driver so Windows was looking for hardware that (after I removed the trojan) wasn't there.

Still curious if you know how to disable a hardware device when Windows won't boot.

Thanks,

Matt
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#4
tampabelle

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Hi Matt,

There are different ways in which it can be handled. The most common one is to use the Safe Mode when booting up.

In Safe Mode, Windows loads the bare minimum drivers and chances are that the infection wont be loaded. It can be then tackled.

There are more drastic measures but less than formatting the hard disk.

Anyway, you can take the following precautions for future -

PREVENTIVE MEASURES FOR FUTURE

Operating System
1. Keep the Windows and Internet Explorer updated with the latest fixes. These fixes are available free from Microsoft. Click on Tools in the IE menu bar and then on Windows update. You can also use the following links

Windows security and critical updates
Internet Explorer security and critical updates

Also ensure that automatic updates are enabled for faster updation of the system.
(Right click on My Computer on your desktop, properties and Automatic Updates tab.


Anti-Virus Software
2. Keep your Anti-virus program updated with the latest definitions. Some of the common anti-virus programs in use are :

Norton Anti-Virus
McAfee Anti-Virus
AVG Anti-Virus --- freeware
Avast Home Edition --- freeware

Use only one anti-virus program as multiple such programs can create conflicts between themselves and severely hamper the performance of your PC.


Firewall
3. You should also have a good firewall. Here are 3 free ones available for personal use:
Sygate Personal Firewall, Kerio Personal Firewall, ZoneAlarm


Internet Browsers
4. Have robust explorer settings. It is preferable to use an internet browser other that IE as most of the malware is targetted at IE. In case you prefer to use IE, then download a list of innocent looking but harmful websites from IE-Spyad and install it on ur PC. IE-SPYAD puts over 5000 sites in your internet explorer's restricted zone, so you'll be protected when you visit innocent-looking sites that aren't really innocent at all.

Some alternate browsers I suggest are Firefox Mozilla Browser and Opera

Ensure that Security level, irrespective of whichever browser you use, is set at Medium or higher, restrict the usage of cookies and activeX components.


Spyware Protection
5. Have a wall of protection against spyware / adware by installing SpywareBlaster and SpywareGuard.

SpywareBlaster and SpywareGuard are by JavaCool and both are free programs.
SpywareBlaster will prevent spyware from being installed and consumes no system resources.
SpywareGuard offers realtime protection from spyware installation and browser hijack attempts. Both have free ongoing updates.


Spyware Removers
6. Install programs for scanning for malware and uninstalling them. Two of the best programs, both are freeware, are :

Spybot Search & Destroy - A powerful tool which can search and annhilate nasties that make it onto your system. Now with an Immunize section that will help prevent future infections.

AdAware SE Personal Edition - Another very powerful tool which searches and kills nasties that infect your system. AdAware and Spybot Search & Destroy compliment each other very well.


Regular Maintenance of PC
7. Finally, invest some time for regular maintenance of your PC. Delete the temporary Internet files, temporary files, cookies etc. Click on Start button, Programs, Accessories, System Tools and run the program Disk Cleanup. Follow the instructions.

An alternate freeware software which can be used is CleanUp.

Keep your Registry clean. My favourite software is Registry First Aid. This is not a freeware but a trial version can be downloaded.


System Restore Points
8. Since your PC is currently clean, create a system restore point. A system restore would enable you to revert to the settings on the PC when the restore point was created. It is also a good idea to flush all earlier system restore points which may be containing infected files.

A. Turn off System Restore.
On the Desktop, right-click My Computer.
Click Properties.
Click the System Restore tab.
Check Turn off System Restore.
Click Apply, and then click OK.

B. Restart your computer.

C. Turn ON System Restore.
On the Desktop, right-click My Computer.
Click Properties.
Click the System Restore tab.
UN-Check Turn off System Restore.
Click Apply, and then click OK.

System Restore will now be active again.


Go ahead and enjoy a clean PC !!!!!!!!!!!!!
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#5
tampabelle

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Since this issue appears to be resolved ... this Topic has been closed. Glad we could help. :tazz:

If you're the topic starter, and need this topic reopened, please contact a staff member with the address of the thread.

Everyone else please begin a New Topic.
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