Query: Sigma rule for Indicates anomalous behavior based on suspicious sign-in activity across multiple tenants from different countries in th
Matching passage: Sigma rule: Indicates anomalous behavior based on suspicious sign-in activity across multiple tenants from different countries in th. Logsource: azure / riskdetection. Rule: title: Suspicious Browser Activity id: 944f6adb-7a99-4c69-80c1-b712579e93e6 status: test description: Indicates anomalous behavior based on suspicious sign-in activity across multiple tenants from different countries in the same browser references: - https://learn.microsoft.com/en-us/entra/id-protection/concept-identity-protection-risks#suspicious-browser - https://learn.microsoft.com/en-us/entra/architecture/security-operations-user-accounts#unusual-sign-ins author: Mark Morowczynski '@markmorow', Gloria Lee, '@gleeiamglo' date: 2023-09-03 tags: - attack.stealth - attack.t1078 - attack.persistence - attack.privilege-escalation - attack.initial-access logsource: product: azure service: riskdetection detection: selection: riskEventType: suspiciousBrowser condition: selection falsepositives: - We recommend investigating the sessions flagged by this detection in the context of other sign-ins from the user. level: high
Near-miss passage: Sigma rule: Detects tampering of RDP Terminal Service/Server sensitive settings. Such as allowing unauthorized users access to a sys. Logsource: windows / registry_set. Rule: title: RDP Sensitive Settings Changed to Zero id: a2863fbc-d5cb-48d5-83fb-d976d4b1743b related: - id: 3f6b7b62-61aa-45db-96bd-9c31b36b653c type: similar - id: 4b8f6d3a-9c5e-4f2a-a7d8-6b9c3e5f2a8d type: similar status: test description: 'Detects tampering of RDP Terminal Service/Server sensitive settings. Such as allowing unauthorized users access to a system via the ''fAllowUnsolicited'' or enabling RDP via ''fDenyTSConnections'', etc. ' references: - https://web.archive.org/web/20200929062532/https://blog.menasec.net/2019/02/threat-hunting-rdp-hijacking-via.html - http://woshub.com/rds-shadow-how-to-connect-to-a-user-session-in-windows-server-2012-r2/ - https://twitter.com/SagieSec/status/1469001618863624194?t=HRf0eA0W1YYzkTSHb-Ky1A&s=03 - https://threathunterplaybook.com/hunts/windows/190407-RegModEnableRDPConnections/notebook.html - https://bazaar.abuse.ch/sample/6f3aa9362d72e806490a8abce245331030d1ab5ac77e400dd475748236a6cc81/ - http://etutorials.org/Microsoft+Products/microsoft+windows+server+2003+terminal+services/Chapter+6+Registry/Registry+Keys+for+Terminal+Services/ - https://admx.help/HKLM/SOFTWARE/Policies/Microsoft/Windows%20NT/Terminal%20Services author: Samir Bousseaden, David ANDRE, Roberto Rodriguez @Cyb3rWard0g, Nasreddine Bencherchali date: 2022-09-29 modified: 2022-11-26 tags: - attack.persistence - attack.defense-impairment - attack.t1112 logsource: category: registry_set product: windows detection: selection: TargetObject|endswith: - \fDenyTSConnections - \fSingleSessionPerUser - \UserAuthentication Details: DWORD (0x00000000) condition: selection falsepositives: - Some of the keys mentioned here could be modified by an administrator while setting group policy (it should be investigated either way) level: medium