Cobalt Strike Potential Command and Control Traffic(18927)

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Cobalt Strike Potential Command and Control Traffic(18927)

L4 Transporter

Anyone seeing this new signature as FP prone?

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Accepted Solutions

L2 Linker

This has been fixed by removing the signature for "Cobalt Strike Potential Command and Control Traffic (18927)" in content version 1840 due to the reason it creates lot of false positives and Paloalto decided to rework on this signature 

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L4 Transporter

We haven't seen any reported at this point.

L7 Applicator

The signature is meant to detect an empty space in "HTTP/1.1 200 OK " (right after the OK) in HTTP responses, which may indicate a connection with a NanoHTTPD server, which is 'typically' used in Cobalt Strike's team server.

 

If you see other HTTPD implementations inserting the "extraneous space", do let us know.

 

More information available at:

https://blog.fox-it.com/2019/02/26/identifying-cobalt-strike-team-servers-in-the-wild/

Hi, yes, I guessed that might be what you defined the signature for.

 

We are seeing hits on this, obviously hoping that it’s a false positive.....

 

It seems to be triggering on valid websites as far as we can tell, and it’s not just one, so either there are a lot of compromised commercial websites or it’s too sensitive.  I can provide the packet captures as necessary.

 

 

As a FYI here are three domains we're seeing hits on:-

 

www.merrell.com

www.belk.com

www.hotelchocolat.com

 

Rgds

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