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Can't Start Computer Because Of Trojan


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#1 gnomess

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Posted 07 January 2008 - 11:04 PM

Hi, I have never used one of these sites so I might not have searched properly, but I think I have. My husbands computer has a Trojan Generic 6 on it, and AVG quarantined it, but now the computer keeps shutting down and will not restart. When we have got it restarted and tried to remove the trojan it just shuts down and now it will not restart. Can someone please advise what we can do when we can't even get the computer to start up. many thanks

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#2 quietman7

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Posted 08 January 2008 - 09:02 AM

Did AVG provide a specific file name associated with this malware threat?

When an anti-virus quarantines a file by moving it into a virus vault (chest), that file is essentially disabled and prevented from causing any harm to your system. The quarantined file is safely held there and no longer a threat until you take action to delete it. One reason for doing this is to prevent deletion of a crucial file that may have been flagged as a "False Positive". If that is the case, then you can restore the file. Have your tried rebooting in "Safe Mode" so you could restore the file?

"Understanding AVG7 Free Virus Vault"
"AVG FAQ #647: I have some files in the AVG Virus Vault. What next?"

When your system shuts down/reboots, are you getting any error messages?

In Windows XP, the default setting is for the computer to reboot automatically when a fatal error or crash occurs. You should be able to see the error by looking in the Event Log. Read "How To Use the Event Viewer Applet".

An alternative is to turn off the automatic reboot feature so you can actually see the error code/STOP Message when it happens - this is also known as the Blue Screen Of Death (BSOD).

To change the recovery settings and Disable Automatic Rebooting, go to Start > Run and type: sysdm.cpl
Click Ok or just press WINKEY + Pause/Break keys to bring up System Properties.
  • Go to the Advanced tab and under "Startup and Recovery", click on the "Settings" button and go to "System failure".
  • Make sure "Write an event to the system log" is checked and that "Automatically restart" is UNchecked.
  • Click "OK" and reboot for the changes to take effect.
Doing this won't cure your problem but instead of crashing and restarting you will get a blue diagnostic screen with an error code and other information that will allow you to better trace your problem. You can use Google to search the error code or post the information back here so we can assist you.

You can try the following to stop the shutdown:

Click on Start > Run and type: cmd
press Enter.
At the Command Prompt type: shutdown -a
press Enter.
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#3 gnomess

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Posted 08 January 2008 - 03:18 PM

Hi, thanks for that info. The Trojan was downloader generic 6 and I think when I was scanning it yesterday it picked up a startdrv.dxd as well. I had found when I did a search abuot starting it in safe mode and then running AVG that that would remove the virus, but the computer would keep shutting down. It could take 5 minutes or half an hour to keep pressing the button to get it started. I am not sure if we might have 2 problems, one a power supply that just happened to kick in at the same time as the virus or if it is all just because of the virus. I am not up with what they can do. There have been no error messages and when the computer does start up, it can run for a few hours (if we are really lucky) and it operates fine, (this was when I was running the scans in safe mode) then it will just shut down without warning.

#4 quietman7

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Posted 08 January 2008 - 10:20 PM

The symptoms you describe could be malware related or they could be due to hardware or overheating problems caused by a failed processor fan, bad memory (RAM), failing power supply, underpowered power supply, CPU overheating, motherboard, video card, faulty drivers, BIOS and firmware problems, dirty hardware, etc. If the computer is overheating, it usually begins to restart on a more regular basis.

However, some rootkits can also trigger BSODs, shutdowns and error messages so download AVG Anti-Rootkit and save to your desktop
  • Double click avgarkt-setup-1.1.0.42.exe to install. By default it will install to C:\Program Files\GRISOFT\AVG Anti-Rootkit
  • Accept the license and follow the prompts to install.
  • You will be asked to reboot to finish the installation so click "Finish".
  • After rebooting, double-click the icon for AVG Anti-Rootkit on your desktop.
  • You will see a window with four buttons at the bottom.
  • Click "Search For Rootkits" and the scan will begin.
  • You will see the progress bar moving from left to right. The scan will take some so be patient and let it finish.
  • When the scan has finished, a small window will open so you can view the results.
  • Right click and select "Save Result To File".
  • By default the file will be saved with a .csv extension. (You can use notepad to open the .cvs file)
  • Copy and paste the results in your next reply.
  • If anything was found, click "Remove selected items"
  • If nothing was found, please click the "Perform in-depth Search" saving anything found to file as before.
Note: Close all open windows, programs, and DO NOT USE the computer while scanning. If the scan is performed while the computer is in use, false positives may appear in the scan results. This is caused by files or registry entries being deleted automatically.

Please download SDFix by AndyManchesta and save it to your desktop.
alternate download
When using this tool, you must use the Administrator's account or an account with "Administrative rights"
  • Double click SDFix.exe and it will extract the files to %systemdrive%
  • (this is the drive that contains the Windows Directory, typically C:\SDFix).
  • DO NOT use it just yet.
Reboot your computer in "Safe Mode" using the F8 method. To do this, restart your computer and after hearing your computer beep once during startup (but before the Windows icon appears) press the F8 key repeatedly. A menu will appear with several options. Use the arrow keys to navigate and select the option to run Windows in "Safe Mode".

Open the SDFix folder and double click RunThis.bat to start the script.
  • Type Y to begin the cleanup process.
  • It will remove any Trojan Services or Registry Entries found then prompt you to press any key to Reboot.
  • Press any Key and it will restart the PC.
  • When the PC restarts, the Fixtool will run again and complete the removal process then display Finished, press any key to end the script and load your desktop icons.
  • Once the desktop icons load, the SDFix report will open on screen and also save a copy into the SDFix folder as Report.txt.
  • Copy and paste the contents of Report.txt in your next reply.
-- If this error message is displayed when running SDFix: "The command prompt has been disabled by your administrator. Press any key to continue..."
Please go to Start Menu > Run > and copy/paste the following line:
%systemdrive%\SDFix\apps\swreg IMPORT %systemdrive%\SDFix\apps\Enable_Command_Prompt.reg
Press Ok and then run SDFix again.

-- If the Command Prompt window flashes on then off again on XP or Win 2000, please go to Start Menu > Run > and copy/paste the following line:
%systemdrive%\SDFix\apps\FixPath.exe /Q
Reboot and then run SDFix again.

-- If SDFix still does not run, check the %comspec% variable. Right-click My Computer > click Properties > Advanced > Environment Variables and check that the ComSpec variable points to cmd.exe.
%SystemRoot%\system32\cmd.exe

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