Query: Sigma YAML for windows / registry_set
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 suspicious process access to LSASS.exe from processes located in uncommon locations with dbgcore.dll or dbghelp.. Logsource: windows / process_access. Rule: title: Suspicious Process Access to LSASS with Dbgcore/Dbghelp DLLs id: 9f5c1d59-33be-4e60-bcab-85d2f566effd related: - id: 416bc4a2-7217-4519-8dc7-c3271817f1d5 type: similar status: experimental description: 'Detects suspicious process access to LSASS.exe from processes located in uncommon locations with dbgcore.dll or dbghelp.dll in the call trace. These DLLs contain functions like MiniDumpWriteDump that can be abused for credential dumping purposes. While modern tools like Mimikatz have moved to using ntdll.dll, dbgcore.dll and dbghelp.dll are still used by basic credential dumping utilities and legacy tools for LSASS memory access and process suspension techniques. ' references: - https://www.splunk.com/en_us/blog/security/you-bet-your-lsass-hunting-lsass-access.html - https://docs.microsoft.com/en-us/windows/win32/api/minidumpapiset/nf-minidumpwritedump author: Swachchhanda Shrawan Poudel (Nextron Systems) date: 2025-11-27 tags: - attack.credential-access - attack.defense-impairment - attack.t1003.001 - attack.t1685 logsource: category: process_access product: windows detection: selection_lsass_calltrace: TargetImage|endswith: \lsass.exe CallTrace|contains: - dbgcore.dll - dbghelp.dll selection_susp_location: SourceImage|contains: - :\Perflogs\ - :\Temp\ - :\Users\Public\ - \$Recycle.Bin\ - \AppData\Roaming\ - \Contacts\ - \Desktop\ - \Documents\ - \Downloads\ - \Favorites\ - \Favourites\ - \inetpub\wwwroot\ - \Music\ - \Pictures\ - \Start Menu\Programs\Startup\ - \Users\Default\ - \Videos\ - \Windows\Temp\ condition: all of selection_* falsepositives: - Possibly during software installation or update processes level: high regression_tests_path: regression_data/rules/windows/process_access/proc_access_win_susp_dbgcore_dbghelp_load/info.yml