PowerShell Alias Obfuscation Resolving iex and Invoke-RestMethod via ClickFix (via process_creation)

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 alias-resolution obfuscation in which Get-Alias and Get-Command wildcards resolve to Invoke-Expression and Invoke-RestMethod, the technique ClearFake ClickFix uses to download and run code in memory while hiding the cmdlet names. Adversaries obfuscate these calls to defeat static command-line detections, making the wildcard alias pattern a strong signal of the fake-CAPTCHA infection chain.

Reporting behind it

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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

PowerShell Alias Obfuscation Resolving iex and Invoke-RestMethod via ClickFix (via process_creation)

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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