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Help please! I have a TrojanDownloader!


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7 replies to this topic

#1 nosmada

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Posted 28 March 2009 - 12:04 PM

Hiya, I use an Asus A8M notebook - OS is Vista SP1.
After recently installing Windows Live OneCare the virus scan reports that I have a TrojanDownloader:Win32/Cutwail.gen!B lurking in the following files;

C:\Users\XXXX\AppData\Roaming\Thunderbird\Profiles\dxhfpb75.default\Mail\pop3.xtra.co.nz\Inbox(part0172:)->(part0002:Statement_to.Oct2008.zip)->Statement_to.Oct2008.doc.exe

C:\Users\XXXX\AppData\Roaming\Thunderbird\Profiles\dxhfpb75.default\Mail\pop3.xtra.co.nz\Inbox(part0392:)->(part0002:Statement_to.Oct2008.zip)->Statement_to.Oct2008.doc.exe

C:\Users\XXXX\AppData\Roaming\Thunderbird\Profiles\dxhfpb75.default\Mail\pop3.xtra.co.nz\Junk(part0330:Statement_01-10.zip)->Statement_01-10.doc.exe->(UPX)

Can I delete these safely? If not, what action should I take? Thanks in advance :thumbsup:

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#2 garmanma

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Posted 28 March 2009 - 09:03 PM

It's in your inbox and junk folder. You haven't opened any attachments have you?
Why not try a mbam scan
-------------------------

The process of cleaning your computer may require you to temporarily disable some security programs. If you are using SpyBot Search and Destroy, please refer to Note 2 at the bottom of this page.

Please download Malwarebytes Anti-Malware and save it to your desktop.
alternate download link 1
alternate download link 2
  • 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.

Note 2:
-- MBAM may make changes to your registry as part of its disinfection routine. If you're using other security programs that detect registry changes (like Spybot's Teatimer), they may interfere with the fix or alert you after scanning with MBAM. Please disable such programs until disinfection is complete or permit them to allow the changes. To disable these programs, please view this topic: How To Temporarily Disable Your Anti-virus, Firewall And Anti-malware Programs
Mark
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#3 nosmada

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Posted 28 March 2009 - 10:35 PM

Hi, thanks for the reply! I already had Malwarebytes but had run it without disabling my firewall & antivirus so here (below) is the result running the scan again with them disabled. It still shows everything to be in the clear (as it did on previous scans). I have also run Spybot, SuperAntiSpyware, A-Squared, HijackThis (showed the all clear with online analysis from HijackThis Logfileauswertung). The only thing that is detecting the infection is Windows Live OneCare but it cannot quarantine or clean the files.
By the way, no, I didn't open any attachments.

Malwarebytes' Anti-Malware 1.35
Database version: 1913
Windows 6.0.6001 Service Pack 1

29/03/2009 4:21:38 p.m.
mbam-log-2009-03-29 (16-21-38).txt

Scan type: Quick Scan
Objects scanned: 63443
Time elapsed: 4 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)

Edited by nosmada, 28 March 2009 - 10:36 PM.


#4 garmanma

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Posted 29 March 2009 - 04:10 PM

Before I went ahead and delete those 3 files, I would submit one to a Jotti scan to be sure
http://virusscan.jotti.org/
Mark
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Having grandkids is God's way of giving you a 2nd chance because you were too busy working your butt off the 1st time around
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#5 nosmada

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Posted 29 March 2009 - 08:52 PM

Hi again, I submitted one of the files to Jotti and 9 scanners out of 20 detected infection. So do you I should go ahead and delete those three files?

#6 garmanma

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Posted 30 March 2009 - 06:45 PM

You can, just understand that you might lose some emails that you saved
Mark
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why won't my laptop work?

Having grandkids is God's way of giving you a 2nd chance because you were too busy working your butt off the 1st time around
Do not send me PMs with problems that should be posted in the forums. Keep it in the forums, so everyone benefits
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#7 nosmada

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Posted 31 March 2009 - 09:21 AM

:thumbsup: many thanks for your help, I deleted those files then uninstalled and reinstalled Thunderbird. you were right - I lost a few emails but nothing of any great consequence. Scans of the new installment reveal a clean bill of health so fingers crossed that's the end of it! Thanks again :flowers:

#8 garmanma

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Posted 31 March 2009 - 03:56 PM

If there are no longer signs of malware then please....

Create a New Restore Point to prevent possible reinfection from an old one. Some of the malware you picked up could have been 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 Start > 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 Start > Run and type: Cleanmgr
  • Click "Ok"
  • Disk Cleanup will scan your files for several minutes, then open.
  • Click the "More Options" Tab.
  • 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 Users can refer to these links: Create a New Restore Point and Disk Cleanup.

-------------------------------

[/list]Tips to protect yourself against malware and reduce the potential for re-infection:
• "Simple and easy ways to keep your computer safe".
• "How did I get infected?, With steps so it does not happen again!".
• "Hardening Windows Security - Part 1 & Part 2".
• "IE Recommended Minimal Security Settings" - "How to Secure Your Web Browser".

• Avoid gaming sites, underground web pages, pirated software, crack sites, and peer-to-peer (P2P) file sharing programs. They are a security risk which can make your computer susceptible to a smörgåsbord of malware infections, remote attacks, exposure of personal information, and identity theft. Many malicious worms and Trojans spread across P2P file sharing networks, gaming and underground sites. Users visiting such pages may see innocuous-looking banner ads containing code which can trigger pop-up ads and Flash ads that install viruses, Trojans and spyware. Ads are a target for hackers because they offer a stealthy way to distribute malware to a wide range of Internet users. The best way to reduce the risk of infection is to avoid these types of web sites and not use any P2P applications. Read P2P Software User Advisories and Risks of File-Sharing Technology.
Mark
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why won't my laptop work?

Having grandkids is God's way of giving you a 2nd chance because you were too busy working your butt off the 1st time around
Do not send me PMs with problems that should be posted in the forums. Keep it in the forums, so everyone benefits
Become a BleepingComputer fan: Facebook and Twitter




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