Query: write Sigma for Detects tampering of RDP Terminal Service/Server sensitive settings. Such as allowing unauthorized users access to a sys
Matching 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
Near-miss passage: Sigma rule: Detects the execution of renamed schtasks.exe binary, which is a legitimate Windows utility used for scheduling tasks. O. Logsource: windows / process_creation. Rule: title: Renamed Schtasks Execution id: f91e51c9-f344-4b32-969b-0b6f6b8537d4 status: experimental description: 'Detects the execution of renamed schtasks.exe binary, which is a legitimate Windows utility used for scheduling tasks. One of the very common persistence techniques is schedule malicious tasks using schtasks.exe. Since, it is heavily abused, it is also heavily monitored by security products. To evade detection, threat actors may rename the schtasks.exe binary to schedule their malicious tasks. ' references: - https://x.com/JangPr0/status/1932034543026065833 - https://ss64.com/nt/schtasks.html author: Swachchhanda Shrawan Poudel (Nextron Systems) date: 2025-11-27 tags: - attack.execution - attack.persistence - attack.privilege-escalation - attack.stealth - attack.t1036.003 - attack.t1053.005 logsource: category: process_creation product: windows detection: selection_cmd_operation: CommandLine|contains|windash: - ' /create ' - ' /delete ' - ' /query ' - ' /change ' - ' /run ' - ' /end ' selection_cmd_flags: CommandLine|contains|windash: - ' /tn ' - ' /tr ' - ' /sc ' - ' /st ' - ' /ru ' - ' /fo ' selection_pe: OriginalFileName: schtasks.exe filter_main_cmd: CommandLine|contains: schtasks filter_main_img: Image|endswith: \schtasks.exe condition: (all of selection_cmd_* and not filter_main_cmd) or (selection_pe and not filter_main_img) falsepositives: - Unlikely level: high