Suspicious PowerShell Version Pinning with Encoded Command

ATT&CK techniques

Execution

Recon
Resource Dev
Initial Access
Execution
- T1059.001PowerShell
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects PowerShell started with an explicit -Version switch together with an encoded command and no-profile flags. The Ymir ransomware launched PowerShell this way to run obfuscated payloads in a controlled runtime while evading profile-based logging.

Reporting behind it

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Suspicious PowerShell Version Pinning with Encoded Command

Pivot detection · T1059.001 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

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