huntrule

Suspicious Hidden PowerShell Executing Substring of Dropped File

PremiumReviewedSigma · High · v1
Product
windows
Category
process_creation
Author
HuntRule
Published
2026-09-06
Updated
2026-09-06
AnalysisDetection

ATT&CK techniques

Execution → Defense Evasion

  1. Recon

  2. Resource Dev

  3. Initial Access

  4. Execution

  5. Persistence

  6. Priv Esc

  7. Defense Evasion

  8. Cred Access

  9. Discovery

  10. Lateral Movement

  11. Collection

  12. C2

  13. Exfiltration

  14. Impact

What it detects

This rule detects a hidden PowerShell process that reads a dropped file with Get-Content, extracts a substring, and invokes it as code, matching the AZORult fileless loader stage. Reading an oddly named data file and executing a slice of it is characteristic of obfuscated PowerShell stagers.

Reporting behind it

Related detections9 linkedT1027 — drag to rearrange
Suspicious Encoded PowerShell Using Base64 Stream Decompression Routines (via process_creation)
Suspicious PowerShell In-Memory Execution with AES Decryption
Suspicious Encoded PowerShell Command Execution
Suspicious PEAKLIGHT Memory-Only PowerShell Downloader Flags (via process_creation)
Obfuscated PowerShell Script: Indirect Cmdlet Execution via ExportedCommands Array Index
Suspicious PowerShell String Concatenation Obfuscation for Batch Extension via LNK (via process_creation)
Suspicious PowerShell Spawned from PyInstaller MEI Extraction Folder (via process_creation)
Suspicious PowerShell Encoded Command Execution
Suspicious PowerShell Invoke-Expression with Replace Obfuscation
Suspicious Hidden PowerShell Executing Substring of Dropped File
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.