{"id":"71886b70-d7b4-4dbf-acce-87d2ca135262","title":"Suspicious Rejected SMB Guest Logon From IP","description":"Detect Attempt PrintNightmare (CVE-2021-1675) Remote code execution in Windows Spooler Service","author":"Florian Roth (Nextron Systems), KevTheHermit, fuzzyf10w","status":"test","level":"medium","date":"2021-06-30","modified":"2023-01-02","tags":["attack.credential-access","attack.t1110.001"],"technique_ids":["T1110.001"],"logsource":{"product":"windows","service":"smbclient-security"},"falsepositives":["Account fallback reasons (after failed login with specific account)"],"references":["https://twitter.com/KevTheHermit/status/1410203844064301056","https://web.archive.org/web/20210629055600/https://github.com/hhlxf/PrintNightmare/","https://web.archive.org/web/20210701042336/https://github.com/afwu/PrintNightmare"],"source_path":"rules/windows/builtin/smbclient/security/win_smbclient_security_susp_failed_guest_logon.yml","source_sha256":"154276760f04f84791877b781d2c00edaf9a13d91add988306bb683843267427","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/builtin/smbclient/security/win_smbclient_security_susp_failed_guest_logon.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 Rejected SMB Guest Logon From IP\nid: 71886b70-d7b4-4dbf-acce-87d2ca135262\nstatus: test\ndescription: Detect Attempt PrintNightmare (CVE-2021-1675) Remote code execution in Windows Spooler Service\nreferences:\n    - https://twitter.com/KevTheHermit/status/1410203844064301056\n    - https://web.archive.org/web/20210629055600/https://github.com/hhlxf/PrintNightmare/\n    - https://web.archive.org/web/20210701042336/https://github.com/afwu/PrintNightmare\nauthor: Florian Roth (Nextron Systems), KevTheHermit, fuzzyf10w\ndate: 2021-06-30\nmodified: 2023-01-02\ntags:\n    - attack.credential-access\n    - attack.t1110.001\nlogsource:\n    product: windows\n    service: smbclient-security\ndetection:\n    selection:\n        EventID: 31017\n        UserName: ''\n        ServerName|startswith: '\\1'\n    condition: selection\nfalsepositives:\n    - Account fallback reasons (after failed login with specific account)\nlevel: medium\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1110.001","id":"T1110.001","name":"Password Guessing","page":"techniques/enterprise/T1110.001/"}],"data_path":"data/detection-rules/71886b70-d7b4-4dbf-acce-87d2ca135262.json","kind":"sigma"}