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Found Random Files - Possible Virus?


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4 replies to this topic

#1 Pho

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Posted 19 September 2008 - 04:05 PM

Today I noticed a file sitting on my desktop titled "C". As in, just the capital letter C with no extension. I thought maybe I had accidentally renamed something important, so I started playing around with it trying to figure out what it was. In the process, I discovered two other files in two other locations with the same filename and approximate file size. One is on my desktop, one in "my documents", and one in "my pictures". They are all different file sizes between 21-25 megs. Two of them were created on the same date about an hour apart. The other one was created 4 days later.

I have no idea what these files could be. I don't think I created them, even mistakenly, since I would never use the "my pictures" folder or tell any programs to store data there. I've tried guessing various file extensions with no luck in finding a match. I tried opening them in a hex editor to look for any clues, but didn't find anything there. Anybody have any suggestions on how to identify an unknown file?

I honestly have no idea what these things are. The only possible idea I can think of is that they might be harvested data a virus or malware program compiled, but it wouldn't make sense to hide them in very common locations. Antivirus and malware scans have turned up nothing.

Any ideas? Thanks!

Edited by Pho, 19 September 2008 - 04:08 PM.


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#2 Guest_superbird_*

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Posted 20 September 2008 - 09:55 AM

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 Download_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 and you may be prompted to restart your computer. (see Note below)
  • 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 will be presented with 1 of 2 prompts. Click OK to either and let MBAM proceed with the disinfection process. If asked to restart the computer, please do so immediately. Failure to reboot will prevent MBAM from removing all the malware.

#3 Pho

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Posted 20 September 2008 - 03:12 PM

Thanks for the help. Scan looks clean.

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

Malwarebytes' Anti-Malware 1.28
Database version: 1182
Windows 5.1.2600 Service Pack 3

9/20/2008 3:09:24 PM
mbam-log-2008-09-20 (15-09-24).txt

Scan type: Quick Scan
Objects scanned: 53400
Time elapsed: 1 minute(s), 51 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 DaChew

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Posted 20 September 2008 - 03:16 PM

You might check in the files properties and see if a date created or modified corresponds to your using a program and it crashing. Or some program running resident and malfunctioning
Chewy

No. Try not. Do... or do not. There is no try.

#5 Guest_superbird_*

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Posted 21 September 2008 - 04:21 AM

Hi Pho,

The log loos clean indeed.
If you want to be sure those files are no viruses, go to www.virustotal.com, and scan the files there. :thumbsup:




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