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Infostealer.Banker.C :(( inside txext.exe, so yes I have a problem!


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#1 guclub

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Posted 29 October 2008 - 04:17 PM

Hi,
I used the symantec to scan my vista pc today. it found Infostealer.Banker.C inside twext.exe. I deleted the file via Sym. I inspected task manager afterwards and found twext.exe on the processes list. I stopped it and restarted my pc. It showed up again! I found the file in system32 folder as well, tried to delete it but couldnt. The "It's being used by another program" dialog box pops up when I try to delete it. I have read nasty things about this trojan. Could you help me to remove it?

Edited by guclub, 29 October 2008 - 04:18 PM.


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#2 xblindx

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Posted 29 October 2008 - 04:42 PM

Hi guclub. Welcome to Bleeping Computer =)

Could you please do the following:

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.

Please include the following in your reply:
-Malwarebytes log

Edited by xblindx, 29 October 2008 - 04:42 PM.


#3 guclub

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Posted 29 October 2008 - 07:06 PM

Hey, thank you for the fast reply! I did the things on the list. I had to restart the pc after the scan. twedt.exe (it is twext.exe, not txext.exe as I wrote in the topic, my mistake) is not in the processes list anymore :thumbsup:. that file is also removed from system32 folder. however there is a dll file called twext.dll left behind. Should I go ahead and delete that manually? Here is the resulting log file...


Malwarebytes' Anti-Malware 1.30
Database version: 1337
Windows 6.0.6001 Service Pack 1

10/30/2008 12:41:56 AM
mbam-log-2008-10-30 (00-41-56).txt

Scan type: Quick Scan
Objects scanned: 55610
Time elapsed: 16 minute(s), 54 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 1
Registry Data Items Infected: 3
Folders Infected: 1
Files Infected: 3

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Network\UID (Malware.Trace) -> Quarantined and deleted successfully.

Registry Data Items Infected:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit (Backdoor.Bot) -> Data: c:\windows\system32\twext.exe -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit (Backdoor.Bot) -> Data: system32\twext.exe -> Quarantined and deleted successfully.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Userinit (Hijack.UserInit) -> Bad: (C:\Windows\system32\userinit.exe,C:\Windows\system32\twext.exe,) Good: (userinit.exe) -> Quarantined and deleted successfully.

Folders Infected:
C:\Windows\System32\twain_32 (Backdoor.Bot) -> Delete on reboot.

Files Infected:
C:\Windows\System32\twain_32\local.ds (Backdoor.Bot) -> Delete on reboot.
C:\Windows\System32\twain_32\user.ds (Backdoor.Bot) -> Delete on reboot.
C:\Windows\System32\twext.exe (Backdoor.Bot) -> Delete on reboot.

#4 guclub

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Posted 30 October 2008 - 05:44 AM

Afterwards i did a full search and got this log in the end..

Malwarebytes' Anti-Malware 1.30
Database version: 1337
Windows 6.0.6001 Service Pack 1

10/30/2008 10:06:48 AM
mbam-log-2008-10-30 (10-06-48).txt

Scan type: Full Scan (C:\|S:\|)
Objects scanned: 176879
Time elapsed: 1 hour(s), 14 minute(s), 12 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)

#5 xblindx

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Posted 30 October 2008 - 03:59 PM

It so far looks clean. However, you may want to read up on the infection that you had here.

Infostealer.Banker.C is a Trojan horse that may steal sensitive information from the compromised computer.



Due to the nature of the infection, you may want to contact your bank and credit card provider. Also, you should check your bank and credit card statement for any suspicious activities.

If your computer was used for online banking, has credit card information or other sensitive data on it, all passwords should be changed immediately to include those used for banking, email, eBay, paypal and online forums. You should consider them to be compromised. They should be changed by using a different computer and not the infected one. If not, an attacker may get the new passwords and transaction information. If using a router, you need to reset it with a strong logon/password so the malware cannot gain control again. and credit card institutions should be notified of the possible security breach. Because your computer was compromised please read How Do I Handle Possible Identify Theft, Internet Fraud and CC Fraud?

Although the infection was identified and removed, your PC has likely been compromised and there is no way to be sure the computer can ever be trusted again. It is dangerous and incorrect to assume that because this malware has been removed the computer is now secure. In some instances an infection may have caused so much damage to your system that it cannot be completely cleaned or repaired. The malware may leave so many remnants behind that security tools cannot find them. Many experts in the security community believe that once infected with this type of malware, the best course of action is to wipe the drive clean, reformat and reinstall the OS. Please read:

"When should I re-format? How should I reinstall?"
"Help: I Got Hacked. Now What Do I Do?"
"Where to draw the line? When to recommend a format and reinstall?"

I am not sure if the infection was serious enough to require a reformat, I will let another more experience member comment on that. However, it was still an infection.

Please download ATF Cleaner by Atribune & save it to your desktop. alternate download link DO NOT use yet.
Please download and install SUPERAntiSpyware Free
  • Double-click SUPERAntiSypware.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 here and unzip into the program's folder.)
  • Under the "Configuration and Preferences", click the Preferences... button.
  • Click the "General and Startup" tab, and under Start-up Options, make sure "Start SUPERAntiSpyware when Windows starts" box is unchecked.
  • Click the "Scanning Control" tab, and 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 and exit the program.
  • Do not run a scan 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".

Double-click ATF-Cleaner.exe to run the program.
  • Under Main "Select Files to Delete" choose: Select All.
  • Click the Empty Selected button.
  • If you use Firefox browser click Firefox at the top and choose: Select All
  • Click the Empty Selected button.
    If you would like to keep your saved passwords, please click No at the prompt.
  • If you use Opera browser click Opera at the top and choose: Select All
  • Click the Empty Selected button.
    If you would like to keep your saved passwords, please click No at the prompt.
  • Click Exit on the Main menu to close the program.
Note: On Vista, "Windows Temp" is disabled. To empty "Windows Temp" ATF-Cleaner must be "Run as an Administrator".

Scan with SUPERAntiSpyware as follows:
  • Launch the program and 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 and click "Next".
  • 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" and reboot normally.
  • 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.


#6 guclub

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Posted 03 November 2008 - 05:12 AM

Hi here is the log from superantispyware..

Would you recommend a format, or can I live without it, what would you say?


SUPERAntiSpyware Scan Log
http://www.superantispyware.com

Generated 11/03/2008 at 10:55 AM

Application Version : 4.21.1004

Core Rules Database Version : 3616
Trace Rules Database Version: 1602

Scan type : Complete Scan
Total Scan Time : 00:52:03

Memory items scanned : 251
Memory threats detected : 0
Registry items scanned : 7726
Registry threats detected : 0
File items scanned : 128636
File threats detected : 72

Adware.Tracking Cookie
C:\Users\avmin\AppData\Roaming\Microsoft\Windows\Cookies\Low\avmin@tribalfusion[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\guclu.bigay@ad.e-kolay[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\guclu.bigay@ad.yieldmanager[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\guclu.bigay@bs.serving-sys[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\guclu.bigay@doubleclick[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\guclu.bigay@indextools[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\guclu.bigay@microsoftwga.112.2o7[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\guclu.bigay@serving-sys[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@2o7[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@abnamronl.122.2o7[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@ad.e-kolay[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@ad.yieldmanager[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@adinterax[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@adlegend[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@adopt.euroclick[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@adrevolver[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@ads.adap[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@ads.maksimum[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@ads.onedream[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@ads.pointroll[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@adserver.pctools[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@adtech[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@advertising.marketnetwork[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@advertising[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@adviva[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@apmebf[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@atdmt[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@beacons.hottraffic[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@bluemango.solution.weborama[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@bluestreak[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@bs.serving-sys[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@bt.ilsemedia[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@casalemedia[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@dmtracker[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@doubleclick[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@eas.apm.emediate[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@eb.adbureau[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@ehg-deltatre.hitbox[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@eyewonder[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@fastclick[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@hitbox[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@ice.112.2o7[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@imrworldwide[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@indextools[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@kontera[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@m1.webstats.motigo[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@media.adrevolver[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@media.adrevolver[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@mediaplex[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@metacafe.122.2o7[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@microsoftwindows.112.2o7[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@msnportal.112.2o7[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@project2.realtracker[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@questionmarket[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@revsci[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@revsci[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@richmedia.yahoo[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@serving-sys[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@smartadserver[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@specificclick[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@stat.onestat[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@statcounter[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@stats.ilsemedia[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@statse.webtrendslive[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@tacoda[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@track.adform[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@tradedoubler[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@tribalfusion[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@weborama[2].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@www1.addfreestats[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@xiti[1].txt
C:\Users\guclu.bigay\AppData\Roaming\Microsoft\Windows\Cookies\Low\guclu.bigay@zedo[2].txt




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