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Internet Browsers Not Working After Trojan.DNSchanger Virus Removal


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#1 seadogs

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Posted 25 July 2011 - 10:46 AM

MalwareBytes recently found three copies of the Trojan.DNSchanger virus on the computer. These viruses have been previously removed along with others, however, these three continue to come back. Each time that they are removed, the internet browsers stop working. In the past, System Restore has been used & the browsers were reinstalled, however, the viruses were back on the computer. I have currently removed the viruses, checked that no proxy is selected, checked that the computer is set to obtain DNS automatically, flushed the DNS, checked the Hosts file, and uninstalled and then reinstalled FIrefox. The browser is still not working. In addition, my MalwareBytes definitions are outdated by 18 days, however when I try to update them, I receive the error message: Program Error Updating: 11004, 0, no address found. I have reinstalled it, to no avail.

Edited by hamluis, 25 July 2011 - 11:34 AM.
Moved from XP to Am I Infected.


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#2 USN Vet

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Posted 25 July 2011 - 11:29 AM

If something keeps coming back, I would run utility Autoruns and uncheck any suspicious programs.
Feel free to ignore my comment, just another user !

#3 jntkwx

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Posted 25 July 2011 - 04:18 PM

Hi seadogs,

Please be advised that:

As this is an open area, available for any member to post in, please use caution when following the advice given. Instructions from the following member groups is to be considered trusted:
Admin | Site Admin | Global Moderator | Moderator | Malware Study Hall Admin | Malware Response Instructor | Malware Response Team | BC Advisor

Other trusted helpers include Malware Study Hall Junior and Malware Study Hall Senior with "Member of the Bleeping Computer A.I.I. early response team!" in their signature.


From this topic: http://www.bleepingcomputer.com/forums/topic182397.html

 

If you still need help, please follow these instructions:

:step1: Download Security Check by screen317 from here.
  • Save it to your Desktop.
  • Double click SecurityCheck.exe and follow the onscreen instructions inside of the black box.
  • A Notepad document should open automatically called checkup.txt.
  • Please post the contents of that document.

:step2: Please download MiniToolBox and run it.

Checkmark following boxes:
  • Report IE Proxy Settings
  • List content of Hosts
  • List IP configuration
  • List last 10 Event Viewer log
  • List Users, Partitions and Memory size
Click Go and post the result.

:step3: Rerun Malwarebytes
Open Malwarebytes, click on the Update tab, and click the check for Updates button.
  • 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 definition 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. Be sure to post the complete log to include the top portion which shows MBAM's database version and your operating system.
  • Exit MBAM when done.
Note: If MBAM encounters a file that is difficult to remove, you will be asked to reboot your computer so MBAM can proceed with the disinfection process. If asked to restart the computer, please do so immediately. Failure to reboot normally (not into safe mode) will prevent MBAM from removing all the malware.

If you have trouble updating, troubleshoot Malwarebytes' Anti-Malware

:step4: Reboot into Normal mode. Next run Superantisypware (SAS):

Download and scan with SUPERAntiSpyware Free for Home Users
  • Double-click SUPERAntiSpyware.exe and use the default settings for installation.
  • An icon will be created on your desktop. Double-click that icon to launch the program.
  • If asked to update the program definitions, click "Yes". If not, update the definitions before scanning by selecting "Check for Updates". (If you encounter any problems while downloading the updates, manually download them from http://www.superantispyware.com/downloads/SASDEFINITIONS.EXE (copy and paste that website address) and save SASDEFINITIONS.EXE to your desktop. Then double-click on SASDEFINITIONS.EXE to install the definitions.)
  • In the Main Menu, click the Preferences... button.
  • Click the Scanning Control tab.
  • Under Scanner Options make sure the following are checked (leave all others unchecked):
    • Close browsers before scanning.
    • Scan for tracking cookies.
    • Terminate memory threats before quarantining.
  • Click the "Close" button to leave the control center screen.
  • Back on the main screen, under "Scan for Harmful Software" click Scan your computer.
  • On the left, make sure you check C:\Fixed Drive.
  • On the right, under "Complete Scan", choose Perform Complete Scan.
  • Click "Next" to start the scan. Please be patient while it scans your computer.
  • After the scan is complete, a Scan Summary box will appear with potentially harmful items that were detected. Click "OK".
  • Make sure everything has a checkmark next to it and click "Next".
  • A notification will appear that "Quarantine and Removal is Complete". Click "OK" and then click the "Finish" button to return to the main menu.
  • If asked if you want to reboot, click "Yes".
  • To retrieve the removal information after reboot, launch SUPERAntispyware again.
    • Click Preferences, then click the Statistics/Logs tab.
    • Under Scanner Logs, double-click SUPERAntiSpyware Scan Log.
    • If there are several logs, click the current dated log and press View log. A text file will open in your default text editor.
    • Please copy and paste the Scan Log results in your next reply.
  • Click Close to exit the program.
If you have a problem downloading, installing or getting SAS to run, try downloading and using the SUPERAntiSpyware Portable Scanner instead. Save the randomly named file (i.e. SAS_1710895.COM) to a USB drive or CD and transfer to the infected computer. Then double-click on it to launch and scan. The file is randomly named to help keep malware from blocking the scanner.

:step5: Please download GMER from one of the following locations and save it to your desktop:
  • Main Mirror
    This version will download a randomly named file (Recommended)
  • Zipped Mirror
    This version will download a zip file you will need to extract first. If you use this mirror, please extract the zip file to your desktop.
  • Disconnect from the Internet and close all running programs.
  • Temporarily disable any real-time active protection so your security programs will not conflict with gmer's driver.
  • Double-click on the randomly named GMER file (i.e. n7gmo46c.exe) and allow the gmer.sys driver to load if asked.
  • Note: If you downloaded the zipped version, extract the file to its own folder such as C:\gmer and then double-click on gmer.exe.

    Posted Image
  • GMER will open to the Rootkit/Malware tab and perform an automatic quick scan when first run. (do not use the computer while the scan is in progress)
  • If you receive a WARNING!!! about rootkit activity and are asked to fully scan your system...click NO.
  • Now click the Scan button. If you see a rootkit warning window, click OK.
  • When the scan is finished, click the Save... button to save the scan results to your Desktop. Save the file as gmer.log.
  • Click the Copy button and paste the results into your next reply.
  • Exit GMER and be sure to re-enable your anti-virus, Firewall and any other security programs you had disabled.

IMPORTANT! If for some reason GMER refuses to run, try again.
If it still fails, try to UN-check "Devices" in right pane.
If still no joy, try to run it from Safe Mode.


In your next reply, please include:
  • Security Check log
  • MiniToolBox log
  • Malwarebytes log
  • SuperAntiSpyware log
  • GMER log
  • How's the computer running now? Please provide a detailed description of your problem, detailed word-for-word error messages that you are receiving, and/or screenshots of strange behavior.

Regards,
Jason

 

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