{"id":"4b09c71e-4269-4111-9cdd-107d8867f0cc","title":"Shell Execution via Flock - Linux","description":"Detects the use of the \"flock\" command to execute a shell. Such behavior may be associated with privilege escalation, unauthorized command execution, or to break out from restricted environments.\n","author":"Li Ling, Andy Parkidomo, Robert Rakowski, Blake Hartstein (Bloomberg L.P.)","status":"test","level":"high","date":"2024-09-02","modified":"","tags":["attack.discovery","attack.t1083"],"technique_ids":["T1083"],"logsource":{"category":"process_creation","product":"linux"},"falsepositives":["Unknown"],"references":["https://gtfobins.github.io/gtfobins/flock/#shell","https://www.elastic.co/guide/en/security/current/linux-restricted-shell-breakout-via-linux-binary-s.html"],"source_path":"rules/linux/process_creation/proc_creation_lnx_flock_shell_execution.yml","source_sha256":"30eab4b6edad6439634e405944e9eef641beba507cbbcff91744a6e3eb718d5b","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/linux/process_creation/proc_creation_lnx_flock_shell_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: Shell Execution via Flock - Linux\nid: 4b09c71e-4269-4111-9cdd-107d8867f0cc\nstatus: test\ndescription: |\n    Detects the use of the \"flock\" command to execute a shell. Such behavior may be associated with privilege escalation, unauthorized command execution, or to break out from restricted environments.\nreferences:\n    - https://gtfobins.github.io/gtfobins/flock/#shell\n    - https://www.elastic.co/guide/en/security/current/linux-restricted-shell-breakout-via-linux-binary-s.html\nauthor: Li Ling, Andy Parkidomo, Robert Rakowski, Blake Hartstein (Bloomberg L.P.)\ndate: 2024-09-02\ntags:\n    - attack.discovery\n    - attack.t1083\nlogsource:\n    category: process_creation\n    product: linux\ndetection:\n    selection_img:\n        Image|endswith: '/flock'\n        CommandLine|contains: ' -u '\n    selection_cli:\n        CommandLine|contains:\n            - '/bin/bash'\n            - '/bin/dash'\n            - '/bin/fish'\n            - '/bin/sh'\n            - '/bin/zsh'\n    condition: all of selection_*\nfalsepositives:\n    - Unknown\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1083","id":"T1083","name":"File and Directory Discovery","page":"techniques/enterprise/T1083/"}],"data_path":"data/detection-rules/4b09c71e-4269-4111-9cdd-107d8867f0cc.json","kind":"sigma"}