Jump to content

Tricephalic Hellkeeper Backdoor Alert on Windows Exchange Server


Recommended Posts

Servus Community,

we have received a backdoor alert from a Yara rule scanner (Thor) on both Exchange servers over the past two days. A signature of the backdoor Tricephalic Hellkeeper was found in the process memory[1]. I'm pretty sure this is a false positive detection, as this backdoor appears to have been developed for Linux and Solaris. I have now whitelisted the rule on both Exchange servers.

Finally, I wanted to ask here if there is any other information known about this backdoor that makes the issue more critical than it appears? Here are the files whose processes are affected. All of them have also been tested negatively by Virustotal. ESET has not reported any suspicious behavior either:

  • PATH: C:\Program Files\Microsoft\Exchange Server\V15\Bin\MSExchangeHMRecovery.exe
  • PATH: C:\Program Files\Microsoft\Exchange Server\V15\Bin\MSExchangeCompliance.exe
  • PATH: C:\Program Files\Microsoft\Exchange Server\V15\Bin\Microsoft.Exchange.Mitigation.Service.exe
  • PATH: C:\Program Files\Microsoft\Exchange Server\V15\Bin\ComplianceAuditService.exe

[1] https://exatrack.com/public/Tricephalic_Hellkeeper.pdf

Thx & Bye Tom

Bildschirmfoto 2022-06-13 um 12.26.22.png

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...