Query: detection rule: 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 DNS query requests to Devtunnels domains. Attackers can abuse that feature to establish a reverse shell or persi. Logsource: windows / dns_query. Rule: title: DNS Query To Devtunnels Domain id: 1cb0c6ce-3d00-44fc-ab9c-6d6d577bf20b related: - id: 9501f8e6-8e3d-48fc-a8a6-1089dd5d7ef4 type: similar - id: 4b657234-038e-4ad5-997c-4be42340bce4 type: similar - id: b3e6418f-7c7a-4fad-993a-93b65027a9f1 type: similar status: test description: 'Detects DNS query requests to Devtunnels domains. Attackers can abuse that feature to establish a reverse shell or persistence on a machine. ' references: - https://blueteamops.medium.com/detecting-dev-tunnels-16f0994dc3e2 - https://learn.microsoft.com/en-us/azure/developer/dev-tunnels/security - https://cydefops.com/devtunnels-unleashed author: citron_ninja date: 2023-10-25 modified: 2023-11-20 tags: - attack.command-and-control - attack.t1071.001 - attack.t1572 logsource: category: dns_query product: windows detection: selection: QueryName|endswith: .devtunnels.ms condition: selection falsepositives: - Legitimate use of Devtunnels will also trigger this. level: medium