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Help me kill Torj/Mbroot-H


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7 replies to this topic

#1 TacoJohn

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Posted 10 March 2010 - 03:01 AM

Had the Antivirus 2010 virus on my computer March 1. Spent a week fighting it and Norton and Webroot seem to have eliminated Mal/HckPK-A, Mal/Genric-A, Mal/FakeAV-BT. However this Troj/Mroot-H lingers even though Webroot says it has it quarantined. PC runs very slow, some aps won't open, wants to freeze, etc. Saw at least one other post about this, and my symptoms match. Need a fix that a novice like myself can accomplish.

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#2 boopme

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Posted 10 March 2010 - 09:04 PM

Hello and welcome ...looks like the Master Boot Record (mbr)may be infected.

Next run MBAM (MalwareBytes):

Please download Malwarebytes Anti-Malware (v1.44) and save it to your desktop.Download Link 1
Download Link 2
MBAM may "make changes to your registry" as part of its disinfection routine. If using other security programs that detect registry changes (ie Spybot's Teatimer), they may interfere or alert you. Temporarily disable such programs or permit them to allow the changes.
  • Make sure you are connected to the Internet.
  • Double-click on mbam-setup.exe to install the application.
    For instructions with screenshots, please refer to the How to use Malwarebytes' Anti-Malware Guide.
  • 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 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.



To check for and confirm the MBR rootkit,

Please download mbr.exe and save it to the root directory, usually C:\ <- (Important!).
  • Go to Start > Run and type: cmd.exe
  • press Ok.
  • At the command prompt type: c:\mbr.exe >>"C:\mbr.log"
  • press Enter.
  • The process is automatic...a black DOS window will open and quickly disappear. This is normal.
  • A log file named mbr.log will be created and saved to the root of the system drive (usually C:\).
  • Copy and paste the results of the mbr.log in your next reply.
If you have a problem using the command prompt, you can just double-click on mbr.exe to run the tool.
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#3 TacoJohn

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Posted 19 March 2010 - 10:12 PM

Thanks,
I ran MBAM an it found no items:

Malwarebytes' Anti-Malware 1.44
Database version: 3886
Windows 5.1.2600 Service Pack 3
Internet Explorer 7.0.5730.11

3/19/2010 8:46:48 PM
mbam-log-2010-03-19 (20-46-48).txt

Scan type: Quick Scan
Objects scanned: 263499
Time elapsed: 1 hour(s), 19 minute(s), 47 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)

Ran mbr.exe and it found:

Stealth MBR rootkit/Mebroot/Sinowal detector 0.3.7 by Gmer, http://www.gmer.net

device: opened successfully
user: MBR read successfully
kernel: MBR read successfully
copy of MBR has been found in sector 0x04A891C1
malicious code @ sector 0x04A891C4 !
PE file found in sector at 0x04A891DA !
MBR rootkit infection detected ! Use: "mbr.exe -f" to fix.

What should I do now? - Thanks!

#4 quietman7

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Posted 20 March 2010 - 07:10 AM

Please download HelpAsst_mebroot_fix.exe by noahdfear, save it to your desktop.
  • Close out all other open programs and windows.
  • Double-click on it to run the tool and follow any prompts.
  • If the tool detects an mbr infection, please allow it to run mbr -f and shutdown your computer.
  • Upon restarting, please wait about 5 minutes, go to Posted Image > Run..., and in the Open dialog box, type: helpasst -mbrt
    Make sure you leave a space between helpasst -mbrt.
  • Click OK or press Enter.
  • HelpAsst fix will create and open a log when done.
  • Copy and paste the contents of that log into your next reply.
*In the event the tool does not detect an mbr infection and completes, do this:
  • Go to Posted Image > Run... and in the Open dialog box, type: mbr -f
  • Click OK or press Enter.
  • Now, please do the Start > Run > mbr -f command a second time.
  • Shut down the computer (do not restart, but shut it down). Wait about five minutes, then start it back up.
  • After restart go to Posted Image > Run... and in the Open dialog box, type: helpasst -mbrt
    Make sure you leave a space between helpasst and -mbrt.
  • Click OK or press Enter.
  • HelpAsst fix will create and open a log when done.
  • Copy and paste the contents of that log into your next reply.
-- Important note to Dell users: Fixing the mbr may prevent access to the the Dell Restore Utility, which allows you to press a key on startup and revert your computer to a factory delivered state. There are a few known fixes for this, though the methods are somewhat advanced. If you are unwilling to take such a risk, you should not allow the tool to execute mbr -f nor execute the command manually. You will either need to restore your computer to a factory state or allow your computer to remain having an infected mbr (the latter not recommended).
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#5 TacoJohn

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Posted 20 March 2010 - 09:41 AM

Thank you, here is the log that was generated:

C:\Documents and Settings\CHRIS\Desktop\HelpAsst_mebroot_fix.exe
Sat 03/20/2010 at 9:26:00.73

HelpAssistant account was found to be Inactive


~~ Checking for termsrv32.dll ~~

termsrv32.dll not found

~~ Checking firewall ports ~~

HKLM\~\services\sharedaccess\parameters\firewallpolicy\domainprofile\globallyopenports\list

HKLM\~\services\sharedaccess\parameters\firewallpolicy\standardprofile\globallyopenports\list


HelpAssistant profile not found in registry

~~ Checking mbr ~~

user & kernel MBR OK

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Status check on Sat 03/20/2010 at 9:32:40.48

Full Name Remote Desktop Help Assistant Account
Account active No
Local Group Memberships

~~ Checking mbr ~~

Stealth MBR rootkit/Mebroot/Sinowal detector 0.3.7 by Gmer, http://www.gmer.net

device: opened successfully
user: MBR read successfully
called modules: ntoskrnl.exe CLASSPNP.SYS disk.sys ACPI.sys hal.dll >>UNKNOWN [0x8AA96CA1]<<
kernel: MBR read successfully
user & kernel MBR OK
copy of MBR has been found in sector 0x04A891C1
malicious code @ sector 0x04A891C4 !
PE file found in sector at 0x04A891DA !

~~ Checking for termsrv32.dll ~~

termsrv32.dll not found


HKEY_LOCAL_MACHINE\system\currentcontrolset\services\termservice\parameters
ServiceDll REG_EXPAND_SZ %systemroot%\System32\termsrv.dll

~~ Checking profile list ~~

No HelpAssistant profile in List

~~ Checking for HelpAssistant directories ~~

HelpAssistant
HelpAssistant.BAKEMAN

~~ Checking firewall ports ~~

[HKLM\~\services\sharedaccess\parameters\firewallpolicy\domainprofile\GloballyOpenPorts\List]

[HKLM\~\services\sharedaccess\parameters\firewallpolicy\standardprofile\GloballyOpenPorts\List]


~~ EOF ~~

#6 quietman7

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Posted 20 March 2010 - 02:54 PM

How is your computer running now? Are there any more reports/alerts about Mebroot?
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#7 TacoJohn

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Posted 20 March 2010 - 10:21 PM

Thank you Quietman7. I appear to be on the path back to health.

#8 quietman7

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Posted 21 March 2010 - 06:40 AM

You're welcome.

If there are no more problems or signs of infection, you should Create a New Restore Point to prevent possible reinfection from an old one. Some of the malware you picked up could have been backed up, renamed and saved in System Restore. Since this is a protected directory your tools cannot access to delete these files, they sometimes can reinfect your system if you accidentally use an old restore point. Setting a new restore point AFTER cleaning your system will help prevent this and enable your computer to "roll-back" to a clean working state.

The easiest and safest way to do this is:
  • Go to Posted Image > Programs > Accessories > System Tools and click "System Restore".
  • Choose the radio button marked "Create a Restore Point" on the first screen then click "Next". Give the R.P. a name, then click "Create". The new point will be stamped with the current date and time. Keep a log of this so you can find it easily should you need to use System Restore.
  • Then use Disk Cleanup to remove all but the most recently created Restore Point.
  • Go to Posted Image > Run... and type: Cleanmgr
  • Click "Ok". Disk Cleanup will scan your files for several minutes, then open.
  • Click the "More Options" tab, then click the "Clean up" button under System Restore.
  • Click Ok. You will be prompted with "Are you sure you want to delete all but the most recent restore point?"
  • Click Yes, then click Ok.
  • Click Yes again when prompted with "Are you sure you want to perform these actions?"
  • Disk Cleanup will remove the files and close automatically.
Vista and Windows 7 users can refer to these links: Create a New Restore Point in Vista or Windows 7 and Disk Cleanup in Vista.
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