Malicious ClickFix MSI Download and Execution via PowerShell

ATT&CK techniques

Execution

Recon
Resource Dev
Initial Access
Execution
- T1059.001PowerShell
- T1204.004Malicious Copy and Paste
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects PowerShell using curl to download an MSI installer to disk, the ClickFix delivery chain used to stage DeerStealer. Victims are socially engineered into pasting a Run-dialog command that fetches and installs a malicious package, so a scripted curl download of an .msi followed by installation is a high-fidelity infection indicator.

Reporting behind it

Related detections9 linkedT1059.001 — drag to rearrange

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SharePoint IIS Worker Process Spawning PowerShell With Encoded Command (via process_creation)

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

PowerShell Hidden DownloadString Execution via ClickFix Fake CAPTCHA (via process_creation)

Malicious ClickFix MSI Download and Execution via PowerShell

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.

Full detection rule

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