Query: write Sigma for Detects whether the image specified in a process creation event doesn't refer to an ".exe" (or other known executable ex
Matching passage: Sigma rule: Detects whether the image specified in a process creation event doesn't refer to an ".exe" (or other known executable ex. Logsource: windows / process_creation. Rule: title: Execution of Suspicious File Type Extension id: c09dad97-1c78-4f71-b127-7edb2b8e491a status: test description: 'Detects whether the image specified in a process creation event doesn''t refer to an ".exe" (or other known executable extension) file. This can be caused by process ghosting or other unorthodox methods to start a process. This rule might require some initial baselining to align with some third party tooling in the user environment. ' references: - https://pentestlaboratories.com/2021/12/08/process-ghosting/ author: Max Altgelt (Nextron Systems) date: 2021-12-09 modified: 2023-11-23 tags: - attack.stealth logsource: category: process_creation product: windows detection: known_image_extension: Image|endswith: - .bin - .cgi - .com - .exe - .scr - .tmp filter_main_image: Image: - System - Registry - MemCompression - vmmem filter_main_msi_installers: Image|contains: :\Windows\Installer\MSI filter_main_driver_store: Image|contains: :\Windows\System32\DriverStore\FileRepository\ filter_main_msi_rollbackfiles: Image|contains: :\Config.Msi\ Image|endswith: - .rbf - .rbs filter_main_windows_temp: - ParentImage|contains: :\Windows\Temp\ - Image|contains: :\Windows\Temp\ filter_main_deleted: Image|contains: :\$Extend\$Deleted\ filter_main_empty: Image: - '-' - '' filter_main_null: Image: null filter_optional_avira: ParentImage|contains: :\ProgramData\Avira\ filter_optional_nvidia: Image|contains: NVIDIA\NvBackend\ Image|endswith: .dat filter_optional_winpakpro: Image|contains: - :\Program Files (x86)\WINPAKPRO\ - :\Program Files\WINPAKPRO\ Image|endswith: .ngn filter_optional_myq_server: Image|endswith: - :\Program Files (x86)\MyQ\Server\pcltool.dll - :\Program Files\MyQ\Server\pcltool.dll filter_optional_wsl: Image|contains|all: - \AppData\Local\Packages\ - \LocalState\rootfs\ filter_optional_lzma_exe: Image|endswith: \LZMA_EXE filter_optional_firefox: Image|contains: :\Program Files\Mozilla Firefox\ filter_optional_docker: ParentImage: C:\Windows\System32\services.exe Image|endswith: com.docker.service condition: not known_image_extension and not 1 of filter_main_* and not 1 of filter_optional_* falsepositives: - Unknown level: medium
Near-miss passage: Sigma rule: Detects enumeration of local system groups. Logsource: macos / process_creation. Rule: title: Local Groups Discovery - MacOs id: 89bb1f97-c7b9-40e8-b52b-7d6afbd67276 status: test description: Detects enumeration of local system groups references: - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1069.001/T1069.001.md author: Ömer Günal, Alejandro Ortuno, oscd.community date: 2020-10-11 modified: 2022-11-27 tags: - attack.discovery - attack.t1069.001 logsource: category: process_creation product: macos detection: selection_1: Image|endswith: /dscacheutil CommandLine|contains|all: - -q - group selection_2: Image|endswith: /cat CommandLine|contains: /etc/group selection_3: Image|endswith: /dscl CommandLine|contains|all: - -list - /groups condition: 1 of selection* falsepositives: - Legitimate administration activities level: informational