{"id":"208748f7-881d-47ac-a29c-07ea84bf691d","title":"Suspicious Outlook Child Process","description":"Detects a suspicious process spawning from an Outlook process.","author":"Michael Haag, Florian Roth (Nextron Systems), Markus Neis, Elastic, FPT.EagleEye Team","status":"test","level":"high","date":"2022-02-28","modified":"2023-02-04","tags":["attack.execution","attack.t1204.002"],"technique_ids":["T1204.002"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["Unknown"],"references":["https://www.hybrid-analysis.com/sample/465aabe132ccb949e75b8ab9c5bda36d80cf2fd503d52b8bad54e295f28bbc21?environmentId=100","https://mgreen27.github.io/posts/2018/04/02/DownloadCradle.html"],"source_path":"rules/windows/process_creation/proc_creation_win_office_outlook_susp_child_processes.yml","source_sha256":"e29b56538de711aa8b082c6ffbe263dc39b2d839098eab4122c3d970e7c3890e","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_office_outlook_susp_child_processes.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Suspicious Outlook Child Process\nid: 208748f7-881d-47ac-a29c-07ea84bf691d\nrelated:\n    - id: 438025f9-5856-4663-83f7-52f878a70a50 # Office Child Processes\n      type: derived\n    - id: e212d415-0e93-435f-9e1a-f29005bb4723 # Outlook Remote Child Process\n      type: derived\nstatus: test\ndescription: Detects a suspicious process spawning from an Outlook process.\nreferences:\n    - https://www.hybrid-analysis.com/sample/465aabe132ccb949e75b8ab9c5bda36d80cf2fd503d52b8bad54e295f28bbc21?environmentId=100\n    - https://mgreen27.github.io/posts/2018/04/02/DownloadCradle.html\nauthor: Michael Haag, Florian Roth (Nextron Systems), Markus Neis, Elastic, FPT.EagleEye Team\ndate: 2022-02-28\nmodified: 2023-02-04\ntags:\n    - attack.execution\n    - attack.t1204.002\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection:\n        ParentImage|endswith: '\\OUTLOOK.EXE'\n        Image|endswith:\n            - '\\AppVLP.exe'\n            - '\\bash.exe'\n            - '\\cmd.exe'\n            - '\\cscript.exe'\n            - '\\forfiles.exe'\n            - '\\hh.exe'\n            - '\\mftrace.exe'\n            - '\\msbuild.exe'        # https://github.com/elastic/detection-rules/blob/c76a39796972ecde44cb1da6df47f1b6562c9770/rules/windows/defense_evasion_execution_msbuild_started_by_office_app.toml\n            - '\\msdt.exe'           # CVE-2022-30190\n            - '\\mshta.exe'\n            - '\\msiexec.exe'\n            - '\\powershell.exe'\n            - '\\pwsh.exe'\n            - '\\regsvr32.exe'\n            - '\\schtasks.exe'\n            - '\\scrcons.exe'\n            - '\\scriptrunner.exe'\n            - '\\sh.exe'\n            - '\\svchost.exe'        # https://www.vmray.com/analyses/2d2fa29185ad/report/overview.html\n            - '\\wmic.exe'           # https://app.any.run/tasks/c903e9c8-0350-440c-8688-3881b556b8e0/\n            - '\\wscript.exe'\n            # Several FPs with rundll32.exe\n            # We started excluding specific use cases and ended up commenting out the rundll32.exe sub processes completely\n            # - '\\rundll32.exe'\n            # filter_outlook_photoviewer:  # https://twitter.com/Luke_Hamp/status/1495919717760237568\n            #   ParentImage|endswith: '\\OUTLOOK.EXE'\n            #   Image|endswith: '\\rundll32.exe'\n            #   CommandLine|contains: '\\PhotoViewer.dll'\n            # filter_outlook_printattachments:  # https://twitter.com/KickaKamil/status/1496238278659485696\n            #   ParentImage|endswith: '\\OUTLOOK.EXE'\n            #   Image|endswith: '\\rundll32.exe'\n            #   CommandLine|contains|all:\n            #     - 'shell32.dll,Control_RunDLL'\n            #     - '\\SYSTEM32\\SPOOL\\DRIVERS\\'\n    condition: selection # and not 1 of filter*\nfalsepositives:\n    - Unknown\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1204.002","id":"T1204.002","name":"Malicious File","page":"techniques/enterprise/T1204.002/"}],"data_path":"data/detection-rules/208748f7-881d-47ac-a29c-07ea84bf691d.json","kind":"sigma"}