{"id":"496a0e47-0a33-4dca-b009-9e6ca3591f39","title":"Suspicious Kerberos RC4 Ticket Encryption","description":"Detects service ticket requests using RC4 encryption type","author":"Florian Roth (Nextron Systems)","status":"test","level":"medium","date":"2017-02-06","modified":"2022-06-19","tags":["attack.credential-access","attack.t1558.003"],"technique_ids":["T1558.003"],"logsource":{"product":"windows","service":"security"},"falsepositives":["Service accounts used on legacy systems (e.g. NetApp)","Windows Domains with DFL 2003 and legacy systems"],"references":["https://adsecurity.org/?p=3458","https://www.trimarcsecurity.com/single-post/TrimarcResearch/Detecting-Kerberoasting-Activity"],"source_path":"rules/windows/builtin/security/win_security_susp_rc4_kerberos.yml","source_sha256":"6b95365726dfb2744695f0402f9784dc015f027f53543b4db4d0f60527b9b2b8","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/builtin/security/win_security_susp_rc4_kerberos.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 Kerberos RC4 Ticket Encryption\nid: 496a0e47-0a33-4dca-b009-9e6ca3591f39\nstatus: test\ndescription: Detects service ticket requests using RC4 encryption type\nreferences:\n    - https://adsecurity.org/?p=3458\n    - https://www.trimarcsecurity.com/single-post/TrimarcResearch/Detecting-Kerberoasting-Activity\nauthor: Florian Roth (Nextron Systems)\ndate: 2017-02-06\nmodified: 2022-06-19\ntags:\n    - attack.credential-access\n    - attack.t1558.003\nlogsource:\n    product: windows\n    service: security\ndetection:\n    selection:\n        EventID: 4769\n        TicketOptions: '0x40810000'\n        TicketEncryptionType: '0x17'\n    reduction:\n        ServiceName|endswith: '$'\n    condition: selection and not reduction\nfalsepositives:\n    - Service accounts used on legacy systems (e.g. NetApp)\n    - Windows Domains with DFL 2003 and legacy systems\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/496a0e47-0a33-4dca-b009-9e6ca3591f39.json","kind":"sigma"}