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Execute remote command through AutoUpdate

Mario Rossi6

Hi everyone,

in a recent analysis of a ransomware attack, where BitLocker was used to encrypt the disk, I found that the company was using Sophos.

In the folder C:\10577-Sophos\AutoUpdate\data\warehouse, I found some files with XML extension that contain executable code and activate BitLocker, using a command like the following from disk A: to Z:

manage-bde -on F: -rp 599368-358941-467368-368093-397672-261921-132506-522577 -sk C:\ -s

I'm not really into Sophos management and administration, but I read that the folder warehouse can be use as a cache for the update installations.

 

Is it possible that the attackers abuse this Sophos functionality to execute remote command activating BitLocker on the remote host?

 

 

Regards,

Matteo. 



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  • 0 in reply to Yashraj S

    Hi Yashraj,

    thank you for the answer.

     

    In order to give you more evidence, I'll attach some files that I found under C:\Sophos\AutoUpdate\data\warehouse.

    If you are able to give me more information I'll be very grateful. Otherwise, I'll manage to request a support case as you said.

     

    Any information about the files would be very useful.



  • 0 in reply to Mario Rossi6

    Hi  

    I'd recommend you open a support ticket to leave no stone unturned in the investigation. Please visit the following link - support.sophos.com. To expedite this, I'll be sending you a PM to get your contact details.

    Thanks,
    Yashraj Singha
    Manager | Global Community Support
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  • 0 in reply to Mario Rossi6

    Hello Matteo and Yashraj,

    this seems strange.
    First of all, is the path really C:\10577-Sophos\... or C:\Sophos\...? Should be C:\ProgramData\Sophos\....

    AutoUpdate does not execute anything from the warehouse, the XML files contain only metadata and no executable code. A file's name is its MD5 with a suffix and the consistency of the warehouse is checked using hashes.

    Furthermore - there are fragments of alc.log (that's under %ProgramData%\Sophos\AutoUpdate\Logs\) at the end of the file that suggest that the on.premise SESC was in use in May. It likely has been replaced with Central as the fragments suggest successful updates from a UNC share and a warehouse is only created when the endpoint updates from Sophos. As said, these fragments are from May.

    All in all pretty weird and as Yashraj has said this requires in-depth investigation.

    Just my two cents.
    Christian

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