Cortex XDR Remote account enumeration

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Cortex XDR Remote account enumeration

L2 Linker


today we have interesting alert


At least 33 distinct non-existing accounts failed to remotely log in to XX-Laptop1. Users list: name.user, user name,, username


User has no idea - all day at school, behind NAT. What I cannot really understand how terminal service can be used when is user behind NAT and there is no port forwarding and any kind of redirect.

Any idea what to check next?


src. IP adresses looks ok via Virus Total




L2 Linker

Ok, so the user was not behind NAT, but school Campus with /20 subnet.
Can anyone explain me, why cortex says the SRC_HOSTNAME = MSTSC.EXE? Does it makes sence?

Probably the FW is not switch to the public, so we will have to investigate the GPO.

L2 Linker

We found out that GPO for local firewall was disabled, so once the laptop left domain, it did not switch to the public profile...

Thanks for posting this! This reaffirmed my analysis of a very similar issue! 

Rashele Shoun
  • 3 replies
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