Query: detection rule: Detects suspicious spawning of a process under a different user context than the parent process. Processes such as notep
Matching passage: Sigma rule: Detects suspicious spawning of a process under a different user context than the parent process. Processes such as notep. Logsource: windows / process_creation. Rule: title: Suspicious Cross-User Process Spawn id: d2b7a134-9c3e-4f8a-b56d-e0c1f8a29b47 status: experimental description: 'Detects suspicious spawning of a process under a different user context than the parent process. Processes such as notepad.exe, calculator etc. are generally spawned under the same user context and also they are often targeted as sacrificial process or decoy process to check successful privilege escalation. ' references: - https://github.com/MSNightmare/LegacyHive - https://git.projectnightcrawler.dev/NightmareEclipse/LegacyHive author: Swachchhanda Shrawan Poudel (Nextron Systems) date: 2026-07-23 tags: - attack.privilege-escalation - attack.stealth - attack.t1055 - attack.t1134 logsource: category: process_creation product: windows detection: selection: Image|endswith: - \notepad.exe - \calc.exe - \mspaint.exe - \wordpad.exe - \write.exe filter_main_same_user: User|fieldref: ParentUser filter_optional_user_null: User: null filter_optional_parent_null: ParentUser: null filter_optional_empty_user: - ParentUser: - '' - '-' - User: - '' - '-' condition: selection and not 1 of filter_main_* and not 1 of filter_optional_* falsepositives: - RunAs usage spawning one of the listed binaries under a different account level: medium regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_susp_cross_user_process_spawn/info.yml
Near-miss passage: Sigma rule: Detects the usage of the 'SeLoadDriverPrivilege' privilege. This privilege is required to load or unload a device driver. Logsource: windows / security. Rule: title: Potential Privileged System Service Operation - SeLoadDriverPrivilege id: f63508a0-c809-4435-b3be-ed819394d612 status: test description: 'Detects the usage of the ''SeLoadDriverPrivilege'' privilege. This privilege is required to load or unload a device driver. With this privilege, the user can dynamically load and unload device drivers or other code in to kernel mode. This user right does not apply to Plug and Play device drivers. If you exclude privileged users/admins and processes, which are allowed to do so, you are maybe left with bad programs trying to load malicious kernel drivers. This will detect Ghost-In-The-Logs (https://github.com/bats3c/Ghost-In-The-Logs) and the usage of Sysinternals and various other tools. So you have to work with a whitelist to find the bad stuff. ' references: - https://web.archive.org/web/20230331181619/https://blog.dylan.codes/evading-sysmon-and-windows-event-logging/ - https://learn.microsoft.com/en-us/previous-versions/windows/it-pro/windows-10/security/threat-protection/auditing/event-4673 author: xknow (@xknow_infosec), xorxes (@xor_xes) date: 2019-04-08 modified: 2026-06-29 tags: - attack.defense-impairment - attack.t1685 logsource: product: windows service: security detection: selection_1: EventID: 4673 PrivilegeList: SeLoadDriverPrivilege Service: '-' filter_main_exact: ProcessName: - C:\Windows\explorer.exe - C:\Windows\HelpPane.exe - C:\Windows\ImmersiveControlPanel\SystemSettings.exe - C:\Windows\System32\Dism.exe - C:\Windows\System32\fltMC.exe - C:\Windows\System32\mmc.exe - C:\Windows\System32\rundll32.exe - C:\Windows\System32\RuntimeBroker.exe - C:\Windows\System32\ShellHost.exe - C:\Windows\System32\svchost.exe - C:\Windows\System32\SystemSettingsBroker.exe - C:\Windows\System32\wimserv.exe filter_optional_others: ProcessName|endswith: - \AppData\Local\Microsoft\Teams\current\Teams.exe - \Google\Chrome\Application\chrome.exe - \procexp.exe - \procexp64.exe - \procexp64a.exe - \procmon.exe - \procmon64.exe - \procmon64a.exe filter_main_startswith: ProcessName|startswith: C:\Program Files\WindowsApps\Microsoft filter_optional_dropbox: ProcessName|startswith: - C:\Program Files (x86)\Dropbox\ - C:\Program Files\Dropbox\ ProcessName|endswith: \Dropbox.exe condition: selection_1 and not 1 of filter_main_* and not 1 of filter_optional_* falsepositives: - Other legimate tools loading drivers. Including but not limited to, Sysinternals, CPU-Z, AVs etc. A baseline needs to be created according to the used