Query: detection rule: Detects suspicious process access to LSASS.exe from processes located in uncommon locations with dbgcore.dll or dbghelp.
Matching 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
Near-miss passage: Sigma rule: Detects the execution of REGSVR32.exe with DLL files masquerading as other files. Logsource: windows / process_creation. Rule: title: Regsvr32 DLL Execution With Suspicious File Extension id: 089fc3d2-71e8-4763-a8a5-c97fbb0a403e related: - id: 8e2b24c9-4add-46a0-b4bb-0057b4e6187d type: obsolete status: test description: Detects the execution of REGSVR32.exe with DLL files masquerading as other files references: - https://thedfirreport.com/2021/11/29/continuing-the-bazar-ransomware-story/ - https://blog.talosintelligence.com/2021/10/threat-hunting-in-large-datasets-by.html - https://guides.lib.umich.edu/c.php?g=282942&p=1885348 - https://harfanglab.io/insidethelab/uac-0057-pressure-ukraine-poland/ author: Florian Roth (Nextron Systems), frack113 date: 2021-11-29 modified: 2025-08-27 tags: - attack.stealth - attack.t1218.010 logsource: category: process_creation product: windows detection: selection_img: - Image|endswith: \regsvr32.exe - OriginalFileName: REGSVR32.EXE selection_cli: CommandLine|endswith: - .bin - .bmp - .cr2 - .dat - .eps - .gif - .ico - .jpeg - .jpg - .log - .nef - .orf - .png - .raw - .rtf - .sr2 - .temp - .tif - .tiff - .tmp - .txt condition: all of selection_* falsepositives: - Unlikely level: high