{"id":"e7888eb1-13b0-4616-bd99-4bc0c2b054b9","title":"Dllhost.EXE Execution Anomaly","description":"Detects a \"dllhost\" process spawning with no commandline arguments which is very rare to happen and could indicate process injection activity or malware mimicking similar system processes.","author":"Nasreddine Bencherchali (Nextron Systems)","status":"test","level":"high","date":"2022-06-27","modified":"2023-05-15","tags":["attack.privilege-escalation","attack.stealth","attack.t1055"],"technique_ids":["T1055"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Unlikely"],"references":["https://redcanary.com/blog/child-processes/","https://nasbench.medium.com/what-is-the-dllhost-exe-process-actually-running-ef9fe4c19c08","https://www.ncsc.gov.uk/static-assets/documents/malware-analysis-reports/goofy-guineapig/NCSC-MAR-Goofy-Guineapig.pdf"],"source_path":"rules/windows/process_creation/proc_creation_win_dllhost_no_cli_execution.yml","source_sha256":"0c44a117787449492bfe698d3567cefdcfc4cee42cd5fa81df5d26dff58d613d","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_dllhost_no_cli_execution.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Dllhost.EXE Execution Anomaly\nid: e7888eb1-13b0-4616-bd99-4bc0c2b054b9\nstatus: test\ndescription: Detects a \"dllhost\" process spawning with no commandline arguments which is very rare to happen and could indicate process injection activity or malware mimicking similar system processes.\nreferences:\n    - https://redcanary.com/blog/child-processes/\n    - https://nasbench.medium.com/what-is-the-dllhost-exe-process-actually-running-ef9fe4c19c08\n    - https://www.ncsc.gov.uk/static-assets/documents/malware-analysis-reports/goofy-guineapig/NCSC-MAR-Goofy-Guineapig.pdf\nauthor: Nasreddine Bencherchali (Nextron Systems)\ndate: 2022-06-27\nmodified: 2023-05-15\ntags:\n    - attack.privilege-escalation\n    - attack.stealth\n    - attack.t1055\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection:\n        Image|endswith: '\\dllhost.exe'\n        CommandLine:\n            - 'dllhost.exe'\n            - 'dllhost'\n    filter_main_null:\n        CommandLine: null\n    condition: selection and not 1 of filter_main_*\nfalsepositives:\n    - Unlikely\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1055","id":"T1055","name":"Process Injection","page":"techniques/enterprise/T1055/"}],"data_path":"data/detection-rules/e7888eb1-13b0-4616-bd99-4bc0c2b054b9.json","kind":"sigma"}