Jump to content


 


Register a free account to unlock additional features at BleepingComputer.com
Welcome to BleepingComputer, a free community where people like yourself come together to discuss and learn how to use their computers. Using the site is easy and fun. As a guest, you can browse and view the various discussions in the forums, but can not create a new topic or reply to an existing one unless you are logged in. Other benefits of registering an account are subscribing to topics and forums, creating a blog, and having no ads shown anywhere on the site.


Click here to Register a free account now! or read our Welcome Guide to learn how to use this site.

Photo

Malware showing up in Malwarebytes


  • Please log in to reply
6 replies to this topic

#1 AlvinB

AlvinB

  • Members
  • 3 posts
  • OFFLINE
  •  
  • Local time:06:00 AM

Posted 15 October 2011 - 05:20 PM



Hi,
I use Malwarebytes and I have found one "Backdoor.Agent" that I can't remove. I am using Win 7 64 bit Home premium. It says it will remove on reboot but does not do so.
This is the first log file..Registry Values Infected:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell (Backdoor.Agent) -> Value: Shell -> Quarantined and deleted successfully.

I then downloaded from Bleeper.com, rkill.com, which I put on a flashdrive.
I went into safe mode and ran rkill from flashdrive. This is what I got after rkill ran:

This log file is located at C:\rkill.log.
Please post this only if requested to by the person helping you.
Otherwise you can close this log when you wish.

Rkill was run on 10/15/2011 at 14:15:07.
Operating System: Windows 7 Home Premium


Processes terminated by Rkill or while it was running:

Processes terminated by Rkill or while it was running:



Rkill completed on 10/15/2011 at 14:15:08.


Rkill completed on 10/15/2011 at 14:15:08.

Then I updated and ran scan of Malwarebytes. It found it and I removed it and got this log file
Registry Values Infected:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell (Backdoor.Agent) -> Value: Shell -> Delete on reboot.

After I rebooted I went back and ran scan on Malwarebytes and it is still there????
Can you please help?
Thanks

BC AdBot (Login to Remove)

 


#2 cryptodan

cryptodan

    Bleepin Madman


  • Members
  • 21,868 posts
  • OFFLINE
  •  
  • Gender:Male
  • Location:Catonsville, Md
  • Local time:01:00 PM

Posted 15 October 2011 - 05:47 PM

Can you post the full log?

And run the following:

SUPERAntiSpyware:

Please download and scan with 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 it will not start, go to Start > All Prgrams > SUPERAntiSpyware and click on Alternate Start.
  • 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. Double-click on the hyperlink for Download Installer 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 "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 unchecked (leave all others checked):
    • Ignore files larger then 4mb
    • Ignore non-executable files

    Now Perform the 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.[list]
    • 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.

SAS Portable
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.


Now GMER

GMER does not work in 64bit Mode!!!!!!

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 Full 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.
-- If you encounter any problems, try running GMER in safe mode.
-- If GMER crashes or keeps resulting in a BSODs, uncheck Devices on the right side before scanning
.


All scans above should be performed in regular boot mode, and if that is not possible then I will post instructions in a follow up reply on how to get into Safe Mode to perform the scans. Also all scans should be COMPLETE and not quick unless specifically instructed to do so.

#3 AlvinB

AlvinB
  • Topic Starter

  • Members
  • 3 posts
  • OFFLINE
  •  
  • Local time:06:00 AM

Posted 17 October 2011 - 01:07 AM

This is for Cryptodan from AlvinB:
I followed your instructions and installed SuperAntispyware Free and tried to follow everything but some things were not the same. Finished scan which took 2 and one half hours.After I went back Preferences, there was no Statistic/log tab, so I can't send copy of log. It mentionted at the end of the removal process "do I want to keep changes to Backdoor.Agent but dissapeared before I could say yes. I still show this in Malwarebytes scan. Below is full copy of log from Malwarebytes:


Malwarebytes' Anti-Malware 1.51.2.1300
www.malwarebytes.org

Database version: 7963

Windows 6.1.7601 Service Pack 1
Internet Explorer 9.0.8112.16421

10/16/2011 10:23:49 PM
mbam-log-2011-10-16 (22-23-49).txt

Scan type: Quick scan
Objects scanned: 212914
Time elapsed: 7 minute(s), 51 second(s)

Memory Processes Infected: 0
Memory Modules Infected: 0
Registry Keys Infected: 0
Registry Values Infected: 1
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:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell (Backdoor.Agent) -> Value: Shell -> Delete on reboot.

Registry Data Items Infected:
(No malicious items detected)

Folders Infected:
(No malicious items detected)

Files Infected:
(No malicious items detected)

I have 2 hard drives with 3 partitions each..The one I use is the 1st partition C W7 main and where this malware is showing up. I also have 2nd partition D XP main which I have not used in months and a 3rd E common with very little in it. I used program called "Bounce Back" which copies everything from 1st HD to 2nd HD.
When it sccanned with Superantispyware it scanned everything on both HD's.
I noticed during scan it founmd no issues in registry and that is where the infection seems to be. Can this Backdoor.Agent do damage to my computer?

I did not go to GMER as you said it would not work with 64 bit which I have.

#4 cryptodan

cryptodan

    Bleepin Madman


  • Members
  • 21,868 posts
  • OFFLINE
  •  
  • Gender:Male
  • Location:Catonsville, Md
  • Local time:01:00 PM

Posted 17 October 2011 - 11:11 AM

Run Gmer anyways, and the logs should be viewable from the home screen via view scan logs.

#5 AlvinB

AlvinB
  • Topic Starter

  • Members
  • 3 posts
  • OFFLINE
  •  
  • Local time:06:00 AM

Posted 17 October 2011 - 06:49 PM

For Cryptodan from AlvinB

I followed your instructions with GMER. At the end of the scan I got this message "Gmer hasn't found any system modifications"
I copied gmer.log to desktop, but it doesn't paste into this message (shows 0 kb )

What should I do? Thanks for your help.

#6 feckhornet

feckhornet

  • Members
  • 1 posts
  • OFFLINE
  •  
  • Local time:01:00 PM

Posted 20 October 2011 - 02:25 PM

Hi,

I appear to have the same issue. I've also been getting repeated error messages stating that svchost.exe has stopped working. I think this may be a virus, but I'm not sure whether the two symptoms are related.

The svc host issue is reported in the event log as:

Faulting application name: svchost.exe
Faulting module name: mshtml.dll

Thanks,
hornet

#7 cryptodan

cryptodan

    Bleepin Madman


  • Members
  • 21,868 posts
  • OFFLINE
  •  
  • Gender:Male
  • Location:Catonsville, Md
  • Local time:01:00 PM

Posted 20 October 2011 - 05:43 PM

For Cryptodan from AlvinB

I followed your instructions with GMER. At the end of the scan I got this message "Gmer hasn't found any system modifications"
I copied gmer.log to desktop, but it doesn't paste into this message (shows 0 kb )

What should I do? Thanks for your help.


Can you run Malwarebytes with a complete scan?


Hi,

I appear to have the same issue. I've also been getting repeated error messages stating that svchost.exe has stopped working. I think this may be a virus, but I'm not sure whether the two symptoms are related.

The svc host issue is reported in the event log as:

Faulting application name: svchost.exe
Faulting module name: mshtml.dll

Thanks,
hornet



Please start your own thread. Your issue could be totally irrelevant to this issue and caused by something totally different.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users