Suspicious PowerShell AES Decryption and Reflective Method Invocation in SolarMarker

ATT&CK techniques

Execution → Defense Evasion

Recon
Resource Dev
Initial Access
Execution
- T1059.001PowerShell
Persistence
Priv Esc
Defense Evasion
- T1027Obfuscated Files or Information
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects PowerShell that combines AES decryption primitives with reflective type loading and method invocation, the in memory staging used by SolarMarker to decrypt and run its second stage. Chaining cryptographic decryption with reflection lets the loader keep the real payload encrypted on disk and only expose it at runtime.

Reporting behind it

Related detections9 linkedT1027 — drag to rearrange

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Malicious Fileless PowerShell Registry Payload Execution via Process Creation

Suspicious Hidden Encoded PowerShell Launching Node.js Runtime

Windows PowerShell Base64-Encoded WMI Class Invocation

PowerShell script alias obfuscation via -Value (-join(...))

Suspicious PowerShell AES Decryption and Reflective Method Invocation in SolarMarker

Pivot detection · T1027 · 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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