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Extension.mismatch


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5 replies to this topic

#1 cjames720

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Posted 25 August 2011 - 02:14 AM

A few days ago I did a scan with Malwarebyes and I found a file was infected with Extension.mismatch. I posted on their forum asking what it was and nobody could tell me, so I just wondering if anyone here can help me. The file was quarantined and deleted. Also the weird part was Norton or my other anti-spyware/malware progrom never picked it up. And I did a scan with Malwarebytes the night before the file showed up as infected was totally clean with no issues. Any incites would be appreciated. Here is the Malware log.



Malwarebytes' Anti-Malware 1.51.1.1800
www.malwarebytes.org

Database version: 7529

Windows 6.1.7601 Service Pack 1
Internet Explorer 9.0.8112.16421

8/21/2011 7:15:20 PM
mbam-log-2011-08-21 (19-15-20).txt

Scan type: Full scan (C:\|D:\|)
Objects scanned: 341006
Time elapsed: 41 minute(s), 45 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: 1

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:
c:\Windows\serviceprofiles\localservice\AppData\Roaming\peernetworking\f233ed93c8f373da83543a30503cbcb33b7981c3.homegroupclassifier\adf46a35e32974f8ce07a32b2aa4a533\grouping\edb0025D.log (Extension.Mismatch) -> Quarantined and deleted successfully. 

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#2 boopme

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Posted 25 August 2011 - 01:45 PM

Hello this may be a False Positive.

Please get the latest definitions and run a quick scan to see if iy returns.
..
Rerun MBAM (MalwareBytes) like this:

Open MBAM in normal/regular mode and click Update tab, select Check for Updates,when done
click Scanner tab,select Quick scan and scan (normal mode).
After scan click Remove Selected, Post new scan log and Reboot into normal mode.
How do I get help? Who is helping me?For the time will come when men will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear....Become a BleepingComputer fan: Facebook

#3 cjames720

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Posted 25 August 2011 - 06:58 PM

Thank you for the reply. I just did a quick scan and nothing showed up. I've also done about 10 full scans since the infected file popped up, and MBAM has shown nothing is infected.

Here is the scan log for the most recent scan:

Malwarebytes' Anti-Malware 1.51.1.1800
www.malwarebytes.org

Database version: 7570

Windows 6.1.7601 Service Pack 1
Internet Explorer 9.0.8112.16421

8/25/2011 7:55:02 PM
mbam-log-2011-08-25 (19-55-02).txt

Scan type: Quick scan
Objects scanned: 172237
Time elapsed: 1 minute(s), 54 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)

#4 boopme

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Posted 25 August 2011 - 07:41 PM

Well,lets get another opinion.


Reboot into Safe Mode with Networking
How to start Windows 7 in Safe Mode


Run TFC by OT (Temp File Cleaner)
Please download TFC by Old Timer and save it to your desktop.
alternate download link

Save any unsaved work. TFC will close ALL open programs including your browser!
Double-click on TFC.exe to run it. If you are using Vista, right-click on the file and choose Run As Administrator.
Click the Start button to begin the cleaning process and let it run uninterrupted to completion.
Important! If TFC prompts you to reboot, please do so immediately. If not prompted, manually reboot the machine anyway to ensure a complete clean.

Next run Superantisypware (SAS):

Download and scan with SUPERAntiSpyware Free for Home Users
  • Double-click SUPERAntiSpyware.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. 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 Scanning Control tab.
  • 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.
  • 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.
  • Click "Next" to start the scan. Please be patient while it scans your computer.
  • 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".
  • 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.
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.
How do I get help? Who is helping me?For the time will come when men will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear....Become a BleepingComputer fan: Facebook

#5 cjames720

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Posted 25 August 2011 - 10:07 PM

I downloaded and used TFC, though I didn't download it while I wasn't in safe mode but ran it while in safe mode. I hope that doesn't make a difference. I ran SAS while in Safe Mode also and didn't find anything. Though I have run run it before and all that pops up is Adware.tracking cookies from youtube, imdb, and a video game site I visit. Here is the log from SAS. Thank you again for the help.

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

Generated 08/25/2011 at 10:54 PM

Application Version : 5.0.1118

Core Rules Database Version : 7606
Trace Rules Database Version: 5418

Scan type : Complete Scan
Total Scan Time : 00:31:04

Operating System Information
Windows 7 Home Premium 64-bit, Service Pack 1 (Build 6.01.7601)
UAC Off - Administrator

Memory items scanned : 399
Memory threats detected : 0
Registry items scanned : 71623
Registry threats detected : 0
File items scanned : 51948
File threats detected : 0

#6 boopme

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Posted 26 August 2011 - 03:23 PM

Reboot your PC and give it a few days and see if it returns,
How do I get help? Who is helping me?For the time will come when men will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear....Become a BleepingComputer fan: Facebook




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