Suspicious PowerShell .NET Extraction from JPG with Base64 Marker
- Product
- windows
- Category
- ps_script
- Author
- HuntRule
- Published
- 2026-09-22
- Updated
- 2026-09-22
ATT&CK techniques
Defense EvasionRecon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact
What it detects
This rule detects PowerShell reading a jpg image and carving an embedded payload delimited by a base64 start marker. Ande Loader hid an AES encrypted .NET assembly inside a new image jpg between BASE64_START markers before hollowing AddInProcess32. Extracting executable code from an image file this way is a steganography style loader technique.
Reporting behind it
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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