Detection rules › Sigma

Terminal Service Process Spawn

Severity
high
Author
Florian Roth (Nextron Systems)
Source
upstream

Detects a process spawned by the terminal service server process (this could be an indicator for an exploitation of CVE-2019-0708)

MITRE ATT&CK coverage

TacticTechniques
Initial AccessT1190 Exploit Public-Facing Application
Lateral MovementT1210 Exploitation of Remote Services

Event coverage

ProviderEvent IDTitle
Sysmon1Process creation

Stages and Predicates

Stage 1: selection

ParentCommandLine|contains: '\svchost.exe'
ParentCommandLine|contains: termsvcs

Stage 2: not 1 of filter_*

or:
Image|endswith: ':\Windows\System32\csrss.exe'
Image|endswith: ':\Windows\System32\wininit.exe'
Image|endswith: ':\Windows\System32\winlogon.exe'
Image|endswith: '\rdpclip.exe'
Image: null

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
Imageends_with
  • :\Windows\System32\csrss.exe
  • :\Windows\System32\wininit.exe
  • :\Windows\System32\winlogon.exe
  • \rdpclip.exe
ParentCommandLinematch
  • \svchost.exe
  • termsvcs