Potential Enumeration via Active Directory Web Service

Identifies processes loading Active Directory related modules followed by a network connection to the ADWS dedicated TCP port. Adversaries may abuse the ADWS Windows service that allows Active Directory to be queried via this web service.

Rule type: eql

Rule indices:

logs-endpoint.events.library-*
logs-endpoint.events.network-*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

https://github.com/FalconForceTeam/SOAPHound

Tags:

Domain: Endpoint
OS: Windows
Use Case: Threat Detection
Tactic: Discovery
Data Source: Elastic Defend

Version: 2

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

edit

sequence by process.entity_id with maxspan=3m
 [library where host.os.type == "windows" and
  dll.name : ("System.DirectoryServices*.dll", "System.IdentityModel*.dll") and
  not user.id in ("S-1-5-18", "S-1-5-19", "S-1-5-20") and
  not process.executable :
                ("?:\\windows\\system32\\dsac.exe",
                 "?:\\program files\\powershell\\?\\pwsh.exe",
                 "?:\\windows\\system32\\windowspowershell\\*.exe",
                 "?:\\windows\\syswow64\\windowspowershell\\*.exe",
                 "?:\\program files\\microsoft monitoring agent\\*.exe",
                 "?:\\windows\\adws\\microsoft.activedirectory.webservices.exe")]
 [network where host.os.type == "windows" and destination.port == 9389 and source.port >= 49152 and
  network.direction == "egress" and network.transport == "tcp" and not cidrmatch(destination.ip, "127.0.0.0/8", "::1/128")]

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Discovery
- ID: TA0007
- Reference URL: https://attack.mitre.org/tactics/TA0007/
Technique:
- Name: Remote System Discovery
- ID: T1018
- Reference URL: https://attack.mitre.org/techniques/T1018/

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