In-Memory Phantom Stealer In-Memory Process Injection via PowerShell Add-Type API Chain (via ps_script)

ATT&CK techniques

Execution → Defense Evasion

Recon
Resource Dev
Initial Access
Execution
- T1059.001PowerShell
Persistence
Priv Esc
- T1055Process Injection
Defense Evasion
- T1055Process Injection
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects PowerShell that compiles inline C# via Add-Type and calls the classic remote-injection Windows API chain used by Phantom Stealer to load shellcode into a benign host process such as explorer.exe. Adversaries leverage this fileless injection to run credential-theft code under a trusted process while evading disk-based detection, making early detection critical for stopping data collection.

Reporting behind it

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In-Memory Phantom Stealer In-Memory Process Injection via PowerShell Add-Type API Chain (via ps_script)

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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