Malicious Reflective Assembly Loading via PowerShell (via ps_script)

ATT&CK techniques

Defense Evasion

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
- T1620Reflective Code Loading
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects PowerShell reflectively loading a .NET assembly through the Reflection Assembly Load method. The multi-stage infection chains extract shellcode or a managed payload embedded in a JPEG and load it directly in memory to evade disk-based detection. Reflective assembly loading is a strong indicator of in-memory payload execution.

Reporting behind it

Related detections9 linkedT1620 — drag to rearrange

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Suspicious PowerShell Reflective Assembly Load With GZip Decompression (via process_creation)

PowerShell Reflective Shellcode Loader via Dynamic API Delegates (via ps_script)

Obfuscated XE Group Reflective Loader via PowerShell Spawned by IIS Worker Process (via process_creation)

Suspicious Reflective Assembly Load in PowerShell (via ps_script)

Malicious VoidLink Fileless Execution via memfd via Memory (via process_creation)

Malicious Reflective Assembly Loading via PowerShell (via ps_script)

Pivot detection · T1620 · 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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