{"id":"e9b61244-893f-427c-b287-3e708f321c6b","title":"Potential Privilege Escalation Using Symlink Between Osk and Cmd","description":"Detects the creation of a symbolic link between \"cmd.exe\" and the accessibility on-screen keyboard binary (osk.exe) using \"mklink\". This technique provides an elevated command prompt to the user from the login screen without the need to log in.","author":"frack113","status":"test","level":"high","date":"2022-12-11","modified":"2022-12-20","tags":["attack.privilege-escalation","attack.persistence","attack.t1546.008"],"technique_ids":["T1546.008"],"logsource":{"product":"windows","category":"process_creation"},"falsepositives":["Unknown"],"references":["https://github.com/redcanaryco/atomic-red-team/blob/5c1e6f1b4fafd01c8d1ece85f510160fc1275fbf/atomics/T1546.008/T1546.008.md","https://ss64.com/nt/mklink.html"],"source_path":"rules/windows/process_creation/proc_creation_win_cmd_mklink_osk_cmd.yml","source_sha256":"52e64f4194078e3d7682b6ea39be5c2ff167eee33b7778e16a15b03bc0e232a7","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_cmd_mklink_osk_cmd.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Potential Privilege Escalation Using Symlink Between Osk and Cmd\nid: e9b61244-893f-427c-b287-3e708f321c6b\nstatus: test\ndescription: Detects the creation of a symbolic link between \"cmd.exe\" and the accessibility on-screen keyboard binary (osk.exe) using \"mklink\". This technique provides an elevated command prompt to the user from the login screen without the need to log in.\nreferences:\n    - https://github.com/redcanaryco/atomic-red-team/blob/5c1e6f1b4fafd01c8d1ece85f510160fc1275fbf/atomics/T1546.008/T1546.008.md\n    - https://ss64.com/nt/mklink.html\nauthor: frack113\ndate: 2022-12-11\nmodified: 2022-12-20\ntags:\n    - attack.privilege-escalation\n    - attack.persistence\n    - attack.t1546.008\nlogsource:\n    product: windows\n    category: process_creation\ndetection:\n    selection_img:\n        - Image|endswith: '\\cmd.exe'\n        - OriginalFileName: 'Cmd.Exe'\n    selection_cli:\n        CommandLine|contains|all:\n            - 'mklink'\n            - '\\osk.exe'\n            - '\\cmd.exe'\n    condition: all of selection_*\nfalsepositives:\n    - Unknown\nlevel: high\nregression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_cmd_mklink_osk_cmd/info.yml\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1546.008","id":"T1546.008","name":"Accessibility Features","page":"techniques/enterprise/T1546.008/"}],"data_path":"data/detection-rules/e9b61244-893f-427c-b287-3e708f321c6b.json","kind":"sigma"}