Potential Remote Desktop Connection to Non-Domain Host

 Original Source: [Sigma source]
Title: Potential Remote Desktop Connection to Non-Domain Host
Status: test
Description:Detects logons using NTLM to hosts that are potentially not part of the domain.
References:
  -n/a
Author: James Pemberton
Date: 2020-05-22
modified:2021-11-27
Tags:
  • -'attack.command-and-control'
  • -'attack.t1219.002'
Logsource:
  • product: windows
  • service: ntlm
  • definition: Requires events from Microsoft-Windows-NTLM/Operational
Detection:
  selection:
    EventID: '8001'
    TargetName|startswith: 'TERMSRV'
  condition:selection
Falsepositives:
  -Host connections to valid domains, exclude these.
  -Host connections not using host FQDN.
  -Host connections to external legitimate domains.
Level: medium