Query: Sigma YAML for windows / process_creation
Matching passage: Sigma rule: Detects instances of svchost.exe running with an unusual or uncommon command line parameter by excluding known legitimat. Logsource: windows / process_creation. Rule: title: Uncommon Svchost Command Line Parameter id: f17211f1-1f24-4d0c-829f-31e28dc93cdd status: experimental description: 'Detects instances of svchost.exe running with an unusual or uncommon command line parameter by excluding known legitimate or common patterns. This could point at a file masquerading as svchost, a process injection, or hollowing of a legitimate svchost instance. ' references: - https://cardinalops.com/blog/the-art-of-anomaly-hunting-patterns-detection/ - https://www.security.com/threat-intelligence/blackbyte-exbyte-ransomware - https://cloud.google.com/blog/topics/threat-intelligence/apt41-initiates-global-intrusion-campaign-using-multiple-exploits/ - https://media.kasperskycontenthub.com/wp-content/uploads/sites/43/2018/03/08064518/Carbanak_APT_eng.pdf author: Liran Ravich date: 2025-11-14 modified: 2026-03-23 tags: - attack.privilege-escalation - attack.stealth - attack.t1036.005 - attack.t1055 - attack.t1055.012 logsource: category: process_creation product: windows detection: selection: Image|endswith: \svchost.exe filter_main_flags: CommandLine|re: -k\s\w{1,64}(?:\s?(?:-p|-s))? filter_main_empty: CommandLine: '' filter_main_null: CommandLine: null filter_optional_defender: ParentImage|endswith: \MsMpEng.exe CommandLine|contains: svchost.exe filter_optional_mrt: ParentImage|endswith: \MRT.exe CommandLine: svchost.exe condition: selection and not 1 of filter_main_* and not 1 of filter_optional_* falsepositives: - Unlikely level: high
Near-miss passage: Sigma rule: Detects an uncommon parent process of "LINK.EXE". Link.EXE in Microsoft incremental linker. Its a utility usually bundle. Logsource: windows / process_creation. Rule: title: Uncommon Link.EXE Parent Process id: 6e968eb1-5f05-4dac-94e9-fd0c5cb49fd6 status: test description: 'Detects an uncommon parent process of "LINK.EXE". Link.EXE in Microsoft incremental linker. Its a utility usually bundled with Visual Studio installation. Multiple utilities often found in the same folder (editbin.exe, dumpbin.exe, lib.exe, etc) have a hardcode call to the "LINK.EXE" binary without checking its validity. This would allow an attacker to sideload any binary with the name "link.exe" if one of the aforementioned tools get executed from a different location. By filtering the known locations of such utilities we can spot uncommon parent process of LINK.EXE that might be suspicious or malicious. ' references: - https://twitter.com/0gtweet/status/1560732860935729152 author: Nasreddine Bencherchali (Nextron Systems) date: 2022-08-22 modified: 2024-06-27 tags: - attack.stealth - attack.t1218 logsource: category: process_creation product: windows detection: selection: Image|endswith: \link.exe CommandLine|contains: LINK / filter_main_visual_studio: ParentImage|startswith: - C:\Program Files\Microsoft Visual Studio\ - C:\Program Files (x86)\Microsoft Visual Studio\ ParentImage|contains: - \VC\bin\ - \VC\Tools\ condition: selection and not 1 of filter_main_* falsepositives: - Unknown level: medium