Remote Thread Creation Via PowerShell In Uncommon Target

Severity: medium
Author: Florian Roth (Nextron Systems)
Source: upstream

Detects the creation of a remote thread from a Powershell process in an uncommon target process

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1059.001` Command and Scripting Interpreter: PowerShell
Defense Evasion	`T1218.011` System Binary Proxy Execution: Rundll32

Event coverage

Provider	Event ID	Title
Sysmon	8	CreateRemoteThread

Stages and Predicates

Stage 1: `selection`

or:
SourceImage|endswith: '\powershell.exe'
SourceImage|endswith: '\pwsh.exe'
or:
TargetImage|endswith: '\regsvr32.exe'
TargetImage|endswith: '\rundll32.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.