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Windows 7: Strange system file on C:\

26 Mar 2013   #1
Migelo

Windows 7 Ultimate x64
 
 
Strange system file on C:\

Hi!

When I checked the "Show system files" box a file I've never seen before appeared in my C:\ directory and no other computer I checked has it.

File name: DCPJQ
File size: 450 KB (461.625 bytes)
SHA256: ae549d170c8c7bfd786368bfaefaac517f1dc5a3fd6f3faa639d65b6bcff8e5c
More info on virustotal link: https://www.virustotal.com/en-gb/fil...8e5c/analysis/

Can somebody please explain this file's purpose? Is it really a system file?

Best Regards
Migelo


My System SpecsSystem Spec
.
26 Mar 2013   #2
Kaktussoft

Microsoft Community Contributor Award Recipient

Microsoft Windows 7 Home Premium 64-bits 7601 Multiprocessor Free Service Pack 1
 
 

It's a file so not a folder? It's located in root folder of C?
My System SpecsSystem Spec
26 Mar 2013   #3
Kaktussoft

Microsoft Community Contributor Award Recipient

Microsoft Windows 7 Home Premium 64-bits 7601 Multiprocessor Free Service Pack 1
 
 

Please post the file as attachment
My System SpecsSystem Spec
.

26 Mar 2013   #4
Migelo

Windows 7 Ultimate x64
 
 

It's a file.

I had to append .docx so it would let me upload it. Originally it comes without an extention.


Attached Files
File Type: docx DCPJQ.docx (450.8 KB, 10 views)
My System SpecsSystem Spec
27 Mar 2013   #5
Kaktussoft

Microsoft Community Contributor Award Recipient

Microsoft Windows 7 Home Premium 64-bits 7601 Multiprocessor Free Service Pack 1
 
 

I renamed it to DCPJQ.txt and analysed it.

Strings inside file:

MandrakeSoft and GRUB and many more.

Did you have linux? Still using linux?

It seems to be part of grub bootloader.
Or maybe it is a temp file created by grub loader.
My System SpecsSystem Spec
27 Mar 2013   #6
Migelo

Windows 7 Ultimate x64
 
 

Interesting idea how to analyze a binary file xD

No, I've never had any linux on this machine but I've booted a live USB with gparted, ubuntu...etc. many times, so that might be it.
My System SpecsSystem Spec
27 Mar 2013   #7
Kaktussoft

Microsoft Community Contributor Award Recipient

Microsoft Windows 7 Home Premium 64-bits 7601 Multiprocessor Free Service Pack 1
 
 

Quote   Quote: Originally Posted by Migelo View Post
Interesting idea how to analyze a binary file xD

No, I've never had any linux on this machine but I've booted a live USB with gparted, ubuntu...etc. many times, so that might be it.
Just rename the file and reboot.

You can rename back using win7 recovery environment if it doesn't boot.
If all is fine.... delete the file
My System SpecsSystem Spec
27 Mar 2013   #8
Migelo

Windows 7 Ultimate x64
 
 

I'll try that and report back once I get home from school.
My System SpecsSystem Spec
27 Mar 2013   #9
gregrocker

 

I would also run a full scan with Malwarebytes and SUPERAntiSpyware and replace that unknown AV with Microsoft Security Essentials.

Turn off SAS at boot in Preferences, and uncheck all of its updater boxes. Update manually before you run it.
My System SpecsSystem Spec
27 Mar 2013   #10
Migelo

Windows 7 Ultimate x64
 
 

I already have MSE installed and it says it's ok.

I'll do that scans as per your suggestion.
My System SpecsSystem Spec
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 Strange system file on C:\




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