topic Re: Incident question - svchost without signature? in Cortex XDR Discussions

Incident question - svchost without signature?

RFeyertag — Sat, 06 Aug 2022 17:36:47 GMT

Hello dear community,

you know how to handle this svchost.exe without signature? In my opinion it is FP, but why?

Isn't it possible for the cortex agent to read the signature from svchost.exe in this case?

I tweaked the alert and gave it medium severity and some more applications.

Rob

Re: Incident question - svchost without signature?

SilviuMihailDascalu — Mon, 08 Aug 2022 13:05:02 GMT

Hi @RFeyertag,

It's a little odd that svchost.exe doesn't have a digital signature and I would like to ask you if you can run an XQL query against this endpoint and identify if the svchost.exe on that endpoint is indeed unsigned or not (please see the query below)?

dataset = xdr_data
| filter agent_hostname = "<endpoint_hostname>" and causality_actor_process_image_name="svchost.exe"
| fields causality_actor_process_image_name, actor_process_signature_vendor, actor_process_signature_status

Thanks,

Silviu

Re: Incident question - svchost without signature?

RFeyertag — Mon, 08 Aug 2022 14:45:45 GMT

Hello Silviu,

yes, I get a few results. See screenshot below. I get these incidents on another computer too and on another pc with explorer.exe.

In summary there are 3 incidents and I need to know, if this is a FP or not.

Rob

Re: Incident question - svchost without signature?

SilviuMihailDascalu — Mon, 08 Aug 2022 14:54:09 GMT

Hi @RFeyertag

Please open a TAC case in order for this to be investigated properly as it seems there are some miss matches between the XQL results and the alert info.