Suspicious Processes Spawned by WinRM

Severity: high
Author: Andreas Hunkeler (@Karneades), Markus Neis
Source: upstream

Detects suspicious processes including shells spawnd from WinRM host process

MITRE ATT&CK coverage

Tactic	Techniques
Initial Access	`T1190` Exploit Public-Facing Application

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation
Security-Auditing	4688	A new process has been created.

Stages and Predicates

Stage 1: `selection`

or:
Image|endswith: '\bash.exe'
Image|endswith: '\bitsadmin.exe'
Image|endswith: '\certutil.exe'
Image|endswith: '\cmd.exe'
Image|endswith: '\powershell.exe'
Image|endswith: '\pwsh.exe'
Image|endswith: '\schtasks.exe'
Image|endswith: '\sh.exe'
Image|endswith: '\whoami.exe'
Image|endswith: '\wsl.exe'
ParentImage|endswith: '\wsmprovhost.exe'

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.