Query: Sigma rule for Detects potential ClickFix malware execution patterns by monitoring registry modifications in RunMRU keys containing HTT
Matching passage: Sigma rule: Detects potential ClickFix malware execution patterns by monitoring registry modifications in RunMRU keys containing HTT. Logsource: windows / registry_set. Rule: title: Potential ClickFix Execution Pattern - Registry id: f5fe36cf-f1ec-4c23-903d-09a3110f6bbb related: - id: d487ed4a-fd24-436d-a0b2-f4e95f7b2635 type: similar status: experimental description: 'Detects potential ClickFix malware execution patterns by monitoring registry modifications in RunMRU keys containing HTTP/HTTPS links. ClickFix is known to be distributed through phishing campaigns and uses techniques like clipboard hijacking and fake CAPTCHA pages. Through the fakecaptcha pages, the adversary tricks users into opening the Run dialog box and pasting clipboard-hijacked content, such as one-liners that execute remotely hosted malicious files or scripts. ' 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://medium.com/@boutnaru/the-windows-foreniscs-journey-run-mru-run-dialog-box-most-recently-used-57375a02d724 - https://unit42.paloaltonetworks.com/preventing-clickfix-attack-vector/ - https://medium.com/@poudelswachchhanda123/preventing-lnk-and-fakecaptcha-threats-a-system-hardening-approach-2f7b7ed2e493 - https://www.scpx.com.au/2025/11/16/decades-old-finger-protocol-abused-in-clickfix-malware-attacks/ author: Swachchhanda Shrawan Poudel (Nextron Systems) date: 2025-03-25 modified: 2025-11-19 tags: - attack.execution - attack.t1204.001 logsource: category: registry_set product: windows detection: selection_registry: TargetObject|contains: \SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\RunMRU\ selection_details: Details|contains: - http:// - https:// selection_susp_pattern: - Details|contains: - account - anti-bot - botcheck - captcha - challenge - confirmation - fraud - human - identification - identificator - identity - robot - validation - verification - verify - Details|contains: - '%comspec%' - bitsadmin - certutil - cmd - cscript - curl - finger - mshta - powershell - pwsh - regsvr32 - rundll32 - schtasks - wget - wscript condition: all of selection_* falsepositives: - Legitimate applications using RunMRU with HTTP links level: high
Near-miss passage: Sigma rule: Detects disabling security tools. Logsource: linux / syslog. Rule: title: Disabling Security Tools - Builtin id: 49f5dfc1-f92e-4d34-96fa-feba3f6acf36 related: - id: e3a8a052-111f-4606-9aee-f28ebeb76776 type: derived status: test description: Detects disabling security tools references: - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1562.004/T1562.004.md author: Ömer Günal, Alejandro Ortuno, oscd.community date: 2020-06-17 modified: 2022-11-26 tags: - attack.defense-impairment - attack.t1686 logsource: product: linux service: syslog detection: keywords: - stopping iptables - stopping ip6tables - stopping firewalld - stopping cbdaemon - stopping falcon-sensor condition: keywords falsepositives: - Legitimate administration activities level: medium