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explorer.exe is at 99% CPU


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#1 mistergreen

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Posted 26 November 2008 - 11:18 PM

My Dell Inspiron B130 has freezing and running slow for the past week. In Windows Task Manager, explorer.exe is at 99 CPU and the Mem Usage climbs until it reaches maximum. Nothing is running while this happens. Also, while this is happening and I click Start, and then All Programs, it says (Empty).

I have run a virus scan (PC cillin), SpyBot, AdAware, and AntiVir and everything comes up clean. Please let me know if there is any other information I should post.
The problem with reality is the lack of background music

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#2 Budapest

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Posted 26 November 2008 - 11:20 PM

Please download Malwarebytes Anti-Malware and save it to your desktop.
  • Make sure you are connected to the Internet.
  • Double-click on mbam-setup.exe to install the application.
  • When the installation begins, follow the prompts and do not make any changes to default settings.
  • When installation has finished, make sure you leave both of these checked:
    • Update Malwarebytes' Anti-Malware
    • Launch Malwarebytes' Anti-Malware
  • Then click Finish.
  • MBAM will automatically start and you will be asked to update the program before performing a scan. If an update is found, the program will automatically update itself. Press the OK button to close that box and continue. If you encounter any problems while downloading the updates, manually download them from here and just double-click on mbam-rules.exe to install.
  • On the Scanner tab:
    • Make sure the "Perform Quick Scan" option is selected.
    • Then click on the Scan button.
  • If asked to select the drives to scan, leave all the drives selected and click on the Start Scan button.
  • The scan will begin and "Scan in progress" will show at the top. It may take some time to complete so please be patient.
  • When the scan is finished, a message box will say "The scan completed successfully. Click 'Show Results' to display all objects found".
  • Click OK to close the message box and continue with the removal process.
  • Back at the main Scanner screen, click on the Show Results button to see a list of any malware that was found.
  • Make sure that everything is checked, and click Remove Selected.
  • When removal is completed, a log report will open in Notepad.
  • The log is automatically saved and can be viewed by clicking the Logs tab in MBAM.
  • Copy and paste the contents of that report in your next reply and exit MBAM.
Note: If MBAM encounters a file that is difficult to remove, you may be asked to reboot your computer so it can proceed with the disinfection process. Regardless if prompted to restart the computer or not, please do so immediately. Failure to reboot normally (not into safe mode) will prevent MBAM from removing all the malware. MBAM may make changes to your registry as part of its disinfection routine. If you're using other security programs that detect registry changes, they may alert you after scanning with MBAM. Please permit the program to allow the changes.
The power of accurate observation is commonly called cynicism by those who haven't got it.

—George Bernard Shaw

#3 mistergreen

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Posted 27 November 2008 - 10:15 AM

Thanks for your help, Budapest. Here is the log from my scan:

Malwarebytes' Anti-Malware 1.30
Database version: 1428
Windows 5.1.2600 Service Pack 3

11/27/2008 10:00:09 AM
mbam-log-2008-11-27 (10-00-09).txt

Scan type: Quick Scan
Objects scanned: 53361
Time elapsed: 8 minute(s), 34 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 18
Registry Data Items Infected: 0
Folders Infected: 0
Files Infected: 1

Memory Processes Infected:
(No malicious items detected)

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
(No malicious items detected)

Registry Values Infected:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\xrt_Shell (Trojan.Agent) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\xrt_id (Backdoor.Agent) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\xrt_options (Backdoor.Agent) -> Delete on reboot.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\xrt_opt_server1 (Backdoor.Agent) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\xrt_opt_reserv (Backdoor.Agent) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\xrt_opt_forms (Backdoor.Agent) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\xrt_opt_certs (Backdoor.Agent) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\xrt_opt_options (Backdoor.Agent) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\xrt_opt_ss (Backdoor.Agent) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\xrt_opt_pstorage (Backdoor.Agent) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\xrt_opt_command (Backdoor.Agent) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\xrt_opt_file (Backdoor.Agent) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\xrt_opt_idproject (Backdoor.Agent) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\xrt_opt_pauseopt (Backdoor.Agent) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\xrt_opt_pausecert (Backdoor.Agent) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\xrt_opt_deletecookie (Backdoor.Agent) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\xrt_opt_deletesol (Backdoor.Agent) -> Quarantined and deleted successfully.
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\xrt_newversion (Backdoor.Agent) -> Quarantined and deleted successfully.

Registry Data Items Infected:
(No malicious items detected)

Folders Infected:
(No malicious items detected)

Files Infected:
C:\Documents and Settings\Kathleen\xrt_gutf.exe (Trojan.Agent) -> Quarantined and deleted successfully.
The problem with reality is the lack of background music

#4 Budapest

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Posted 27 November 2008 - 04:21 PM

Reboot your computer, run the scan again and post the new log.

Your log shows a backdoor infection. Some of these can be very nasty and your online passwords may have been compromised.
The power of accurate observation is commonly called cynicism by those who haven't got it.

—George Bernard Shaw

#5 mistergreen

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Posted 30 November 2008 - 04:37 PM

Here's the log.

Malwarebytes' Anti-Malware 1.30
Database version: 1428
Windows 5.1.2600 Service Pack 3

11/30/2008 4:36:03 PM
mbam-log-2008-11-30 (16-36-03).txt

Scan type: Quick Scan
Objects scanned: 52529
Time elapsed: 5 minute(s), 44 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 0
Registry Data Items Infected: 0
Folders Infected: 0
Files Infected: 0

Memory Processes Infected:
(No malicious items detected)

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
(No malicious items detected)

Registry Values Infected:
(No malicious items detected)

Registry Data Items Infected:
(No malicious items detected)

Folders Infected:
(No malicious items detected)

Files Infected:
(No malicious items detected)
The problem with reality is the lack of background music

#6 Budapest

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Posted 30 November 2008 - 04:40 PM

Now run this scan:

http://www.bleepingcomputer.com/forums/t/131299/how-to-use-sdfix/
The power of accurate observation is commonly called cynicism by those who haven't got it.

—George Bernard Shaw




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