Suspicious PowerShell Base64 Encoded Staged Downloader via process_creation

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 executed with an encoded command combined with a hidden window and execution policy bypass which is typical of a staged malware downloader. TookPS used base64-encoded PowerShell stages to pull additional payloads before deploying the TeviRat and Lapmon backdoors. Encoded and hidden PowerShell invocations are a frequent early stage of intrusions and merit detection.

Reporting behind it

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Suspicious PowerShell Base64 Encoded Staged Downloader via process_creation

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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