Query: Sigma rule for Detects Non-Standard tools initiating a connection over port 3389 indicating possible lateral movement. An initial basel
Matching passage: Sigma rule: Detects Non-Standard tools initiating a connection over port 3389 indicating possible lateral movement. An initial basel. Logsource: windows / network_connection. Rule: title: Outbound RDP Connections Over Non-Standard Tools id: ed74fe75-7594-4b4b-ae38-e38e3fd2eb23 status: test description: 'Detects Non-Standard tools initiating a connection over port 3389 indicating possible lateral movement. An initial baseline is required before using this utility to exclude third party RDP tooling that you might use. ' references: - https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0708 author: Markus Neis date: 2019-05-15 modified: 2024-02-09 tags: - attack.lateral-movement - attack.t1021.001 - car.2013-07-002 logsource: category: network_connection product: windows detection: selection: DestinationPort: 3389 Initiated: 'true' filter_main_mstsc: Image: - C:\Windows\System32\mstsc.exe - C:\Windows\SysWOW64\mstsc.exe filter_optional_dns: Image: C:\Windows\System32\dns.exe SourcePort: 53 Protocol: udp filter_optional_avast: Image|endswith: - \Avast Software\Avast\AvastSvc.exe - \Avast\AvastSvc.exe filter_optional_sysinternals_rdcman: Image|endswith: \RDCMan.exe filter_optional_chrome: Image: C:\Program Files\Google\Chrome\Application\chrome.exe filter_optional_third_party: Image|endswith: - \FSAssessment.exe - \FSDiscovery.exe - \MobaRTE.exe - \mRemote.exe - \mRemoteNG.exe - \Passwordstate.exe - \RemoteDesktopManager.exe - \RemoteDesktopManager64.exe - \RemoteDesktopManagerFree.exe - \RSSensor.exe - \RTS2App.exe - \RTSApp.exe - \spiceworks-finder.exe - \Terminals.exe - \ws_TunnelService.exe filter_optional_thor: Image|endswith: - \thor.exe - \thor64.exe filter_optional_splunk: Image|startswith: C:\Program Files\SplunkUniversalForwarder\bin\ filter_optional_sentinel_one: Image|endswith: \Ranger\SentinelRanger.exe filter_optional_firefox: Image: C:\Program Files\Mozilla Firefox\firefox.exe filter_optional_tsplus: Image: - C:\Program Files\TSplus\Java\bin\HTML5service.exe - C:\Program Files (x86)\TSplus\Java\bin\HTML5service.exe filter_optional_null: Image: null filter_optional_empty: Image: '' filter_optional_unknown: Image: <unknown process> condition: selection and not 1 of filter_main_* and not 1 of filter_optional_* falsepositives: - Third party RDP tools level: high
Near-miss passage: Sigma rule: Detects the creation of a dMSASvc account using the New-ADServiceAccount cmdlet in certain OUs. The fact that the Cmdlet. Logsource: windows / process_creation. Rule: title: New DMSA Service Account Created in Specific OUs id: 0ea8db81-2ff6-4525-9448-33bbe7effc13 related: - id: e15bc294-ae2a-45ad-b7d6-637b33868bde type: similar - id: 02122374-b74e-495c-b285-9e4da973f3d6 type: similar status: experimental description: 'Detects the creation of a dMSASvc account using the New-ADServiceAccount cmdlet in certain OUs. The fact that the Cmdlet is used to create a dMSASvc account in a specific OU is highly suspicious. It is a pattern trying to exploit the BadSuccessor privilege escalation vulnerability in Windows Server 2025. On top of that, if the user that is creating the dMSASvc account is not a legitimate administrator or does not have the necessary permissions, it is a strong signal of an attempted or successful abuse of the BaDSuccessor vulnerability for privilege escalation within the Windows Server 2025 Active Directory environment. ' references: - https://www.akamai.com/blog/security-research/abusing-bad-successor-for-privilege-escalation-in-active-directory author: Swachchhanda Shrawan Poudel (Nextron Systems) date: 2025-05-24 tags: - attack.privilege-escalation - attack.initial-access - attack.persistence - attack.stealth - attack.t1078.002 - attack.t1098 logsource: category: process_creation product: windows detection: selection_img: - Image|endswith: - \powershell.exe - \pwsh.exe - \powershell_ise.exe - OriginalFileName: - powershell.exe - pwsh.dll - powershell_ise.exe selection_cli: CommandLine|contains|all: - New-ADServiceAccount - -CreateDelegatedServiceAccount - -path condition: all of selection_* falsepositives: - Unknown level: medium