{"id":"503fe26e-b5f2-4944-a126-eab405cc06e5","title":"Kerberos Network Traffic RC4 Ticket Encryption","description":"Detects kerberos TGS request using RC4 encryption which may be indicative of kerberoasting","author":"sigma","status":"test","level":"medium","date":"2020-02-12","modified":"2021-11-27","tags":["attack.credential-access","attack.t1558.003"],"technique_ids":["T1558.003"],"logsource":{"product":"zeek","service":"kerberos"},"falsepositives":["Normal enterprise SPN requests activity"],"references":["https://adsecurity.org/?p=3458"],"source_path":"rules/network/zeek/zeek_susp_kerberos_rc4.yml","source_sha256":"7cd43c7f1e4861c716520d6cced995adb96bea6fb7daa4d5d5862b4e3258460c","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/network/zeek/zeek_susp_kerberos_rc4.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Kerberos Network Traffic RC4 Ticket Encryption\nid: 503fe26e-b5f2-4944-a126-eab405cc06e5\nstatus: test\ndescription: Detects kerberos TGS request using RC4 encryption which may be indicative of kerberoasting\nreferences:\n    - https://adsecurity.org/?p=3458\nauthor: sigma\ndate: 2020-02-12\nmodified: 2021-11-27\ntags:\n    - attack.credential-access\n    - attack.t1558.003\nlogsource:\n    product: zeek\n    service: kerberos\ndetection:\n    selection:\n        request_type: 'TGS'\n        cipher: 'rc4-hmac'\n    computer_acct:\n        service|startswith: '$'\n    condition: selection and not computer_acct\nfalsepositives:\n    - Normal enterprise SPN requests activity\nlevel: medium\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1558.003","id":"T1558.003","name":"Kerberoasting","page":"techniques/enterprise/T1558.003/"}],"data_path":"data/detection-rules/503fe26e-b5f2-4944-a126-eab405cc06e5.json","kind":"sigma"}