Query: Sigma rule 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 the addition of a new "Allow" firewall rule by the WMI process (WmiPrvSE.EXE). This can occur if an attacker lev. Logsource: windows / firewall-as. Rule: title: New Firewall Rule Added In Windows Firewall Exception List Via WmiPrvSE.EXE id: eca81e8d-09e1-4d04-8614-c91f44fd0519 status: test description: 'Detects the addition of a new "Allow" firewall rule by the WMI process (WmiPrvSE.EXE). This can occur if an attacker leverages PowerShell cmdlets such as "New-NetFirewallRule", or directly uses WMI CIM classes such as "MSFT_NetFirewallRule". ' references: - https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1562.004/T1562.004.md#atomic-test-24---set-a-firewall-rule-using-new-netfirewallrule - https://malware.news/t/the-rhysida-ransomware-activity-analysis-and-ties-to-vice-society/72170 - https://cybersecuritynews.com/rhysida-ransomware-attacking-windows/ author: frack113, Nasreddine Bencherchali (Nextron Systems) date: 2024-05-10 tags: - attack.defense-impairment - attack.t1686.003 logsource: product: windows service: firewall-as detection: selection: EventID: - 2004 - 2071 - 2097 Action: 3 ModifyingApplication|endswith: :\Windows\System32\wbem\WmiPrvSE.exe condition: selection falsepositives: - Administrator scripts or activity. level: medium