Suspicious ClickFix/FileFix Execution Pattern

Title: Suspicious ClickFix/FileFix Execution Pattern
Status: experimental
Description:Detects suspicious execution patterns where users are tricked into running malicious commands via clipboard manipulation, either through the Windows Run dialog (ClickFix) or File Explorer address bar (FileFix). Attackers leverage social engineering campaigns—such as fake CAPTCHA challenges or urgent alerts—encouraging victims to paste clipboard contents, often executing mshta.exe, powershell.exe, or similar commands to infect systems.
References:
  -https://github.com/JohnHammond/recaptcha-phish
  -https://www.zscaler.com/blogs/security-research/deepseek-lure-using-captchas-spread-malware
  -https://www.threatdown.com/blog/clipboard-hijacker-tries-to-install-a-trojan/
  -https://app.any.run/tasks/5c16b4db-4b36-4039-a0ed-9b09abff8be2
  -https://www.esentire.com/security-advisories/netsupport-rat-clickfix-distribution
  -https://www.scpx.com.au/2025/11/16/decades-old-finger-protocol-abused-in-clickfix-malware-attacks/
Author: montysecurity, Swachchhanda Shrawan Poudel (Nextron Systems)
Date: 2025-11-19
modified:None
Tags:

• -'attack.execution'
• -'attack.t1204.001'
• -'attack.t1204.004'

Logsource:

• category: process_creation
• product: windows

Detection:
  selection_parent:
    ParentImage|endswith: '\explorer.exe'
    CommandLine|contains: '#'
  selection_cli_captcha:
    CommandLine|contains:
      -'account'
      -'anti-bot'
      -'botcheck'
      -'captcha'
      -'challenge'
      -'confirmation'
      -'fraud'
      -'human'
      -'identification'
      -'identificator'
      -'identity'
      -'robot'
      -'validation'
      -'verification'
      -'verify'

  condition:all of selection_*
Falsepositives:
  -Unlikely
Level: high