Infected with Trojan.Downloader / Trojan.Agent / Bagle

Hi,

My partner's laptop is infected with a pretty nasty virus (and she gave me the job of fixing it!).

The virus killed the internet connection, disabled Norton anti-virus and generally slows down the whole machine.

I already ran malwarebytes anti-malware, which found the following:
Trojan.Downloader
Trojan.Agent
Trojan.Spammer
Rootkit.Bagle

Malwarebytes tried to remove the infected files but the virus just returns on reboot.

I also ran hijackthis. I can post both the logs if requested.

Thanks in advance for any help!

Cheers,
Karol.

Hi Karol and welcome to BC

Let's do a few tasks. If you are using a wireless router, please reset it and make sure it is set to automatically obtain a DNS address. Routers vary, so you may have to reference your manual. If you do not have a manual, please let us know what the model and make of your router is. Also, please make sure you place an administrator password on your router. Don't forget to write this information down = you may need it 6 months from now

Please rerun Malwarebytes using these instructions:

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

Hi Rigel,

Thanks for the quick reply.

I did as you said - see below for the log. I should stress that I ran MBAM three times now - twice using a full scan and once on quick scan. The first scan found 72 infections, the second found 22 and this one found 5.

The virus is clearly still active, however.

I should also add that I figured out how to get the internet back. I found instructions in another forum on changing a registry value located in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Ndisuio. The 'Start' value should be set to 1, 2 or 3, but keeps getting switched to 4, which disables the internet. When I switch this value round, I can use the internet, but when I reboot, the value always reverts back to 4.

Is there a way to avoid resetting the wireless router? The reason is that its a shared connection amongst quite a number of computers and it would be a big disruption to reconfigure the whole network. Its a secure password-protected connection which has registered MAC addresses for all users on the network.

Cheers,
Karol.





Malwarebytes' Anti-Malware 1.36
Database version: 2171
Windows 5.1.2600 Service Pack 2

24/05/2009 1:26:10 PM
mbam-log-2009-05-24 (13-26-10).txt

Scan type: Quick Scan
Objects scanned: 98227
Time elapsed: 20 minute(s), 56 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 1
Registry Values Infected: 1
Registry Data Items Infected: 0
Folders Infected: 1
Files Infected: 2

Memory Processes Infected:
(No malicious items detected)

Memory Modules Infected:
(No malicious items detected)

Registry Keys Infected:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\srosa (Rootkit.Bagle) -> Delete on reboot.

Registry Values Infected:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\drvsyskit (Rootkit.Bagle) -> Delete on reboot.

Registry Data Items Infected:
(No malicious items detected)

Folders Infected:
C:\WINDOWS\system32\drivers\downld (Trojan.Agent) -> Quarantined and deleted successfully.

Files Infected:
C:\WINDOWS\system32\drivers\hldrrr.exe (Rootkit.Bagle) -> Delete on reboot.
C:\WINDOWS\system32\drivers\srosa.sys (Rootkit.Bagle) -> Quarantined and deleted successfully.

Hi Karol...

Bagle can be a pain to clean. We need to run a full set of scans to make sure things are back to normal.

Please download DrWeb-CureIt and save it to your desktop. DO NOT perform a scan 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".

Scan with Dr.Web CureIt as follows:

• Double-click on launch.exe to open the program and click Start. (There is no need to update if you just downloaded the most current version
• Read the Virus check by DrWeb scanner prompt and click Ok where asked to Start scan now? Allow the setup.exe to load if asked by any of your security programs.
• The Express scan will automatically begin.
  (This is a short scan of files currently running in memory, boot sectors, and targeted folders).
• If prompted to dowload the Full version Free Trial, ignore and click the X to close the window.
• If an infected object is found, you will be prompted to move anything that cannot be cured. Click Yes to All.
• When complete, click Select All, then choose Cure > Move incurable.
  (This will move any detected files to the C:\Documents and Settings\userprofile\DoctorWeb\Quarantine folder if they can't be cured)

• Now put a check next to Complete scan to scan all local disks and removable media.
• In the top menu, click Settings > Change settings, and UNcheck "Heuristic analysis" under the "Scanning" tab, then click Ok.
• Back at the main window, click the green arrow "Start Scanning" button on the right under the Dr.Web logo.
• When the scan is complete, a message will be displayed at the bottom indicating if any viruses were found.
• Click "Yes to all" if asked to cure or move the file(s) and select "Move incurable".
• In the top menu, click file and choose save report list.
• Save the DrWeb.csv report to your desktop.
• Exit Dr.Web Cureit when done.
• Important! Reboot your computer because it could be possible that files in use will be moved/deleted during reboot.
• After reboot, post the contents of the log from Dr.Web in your next reply. (You can use Notepad to open the DrWeb.cvs report)

I followed the instructions, but could not restart into safe mode. Still at the black screen, I received the following error:

"We apologize for the inconvenience, but Windows did not start successfully. A recent hardware or software change might have caused this". I tried it a number of times and no luck. Clicking 'last known working configuration', just goes to normal windows startup.

No problem. Try running Dr.Web in normal mode. Post the log.

No luck running in normal mode, either.

When I tried to run the first time, the program terminated abnormally after the first few prompts.

I tried to run a second time and windows crashed. It went to the blue 'dump of physical memory' screen, with the following error:
9u2AbYgB.sys - PAGE_FAULT_IN_NONPAGED_AREA - Address EF44F12D base at EF43600, DateStamp 49ef0adb'

I was running it on a fresh system, having just restarted.

Dang

Ok... let's move you to the HJT forum. Please follow this guide from step (6). Post a HJT log to the HJT forum and a Team member will be along to help you as soon as possible. You may wish to post a link back to this topic to see what was discussed thus far.

If you need any help with the guide, please let me know. Best wishes - you are in good hands...

Done.

Thanks for all your help, Rigel.

Hello,

Now that you have posted a log here: http://www.bleepingcomputer.com/forums/t/229402/infected-with-trojandownloader-trojanagent-bagle/ you should NOT make further changes to your computer (install/uninstall programs, use special fix tools, delete files, edit the registry, etc) unless advised by a HJT Team member, nor should you continue to ask for help elsewhere. Doing so can result in system changes which may not show in the log you already posted. Further, any modifications you make on your own may cause confusion for the helper assisting you and could complicate the malware removal process which would extend the time it takes to clean your computer.

From this point on the HJT Team should be the only members that you take advice from, until they have verified your log as clean.

Please be patient. It may take a while to get a response because the HJT Team members are EXTREMELY busy working logs posted before yours. They are volunteers who will help you out as soon as possible. Once you have made your post and are waiting, please DO NOT make another reply until it has been responded to by a member of the HJT Team. Generally the staff checks the forum for postings that have 0 replies as this makes it easier for them to identify those who have not been helped. If you post another response there will be 1 reply. A team member, looking for a new log to work may assume another HJT Team member is already assisting you and not open the thread to respond. Please be patient. It may take a while to get a response but your log will be reviewed and answered as soon as possible

To avoid confusion, I am closing this topic. Good luck with your log.

Orange Blossom