Windows Account or Group Discovery

Elastic Stack Serverless Security

This rule identifies the execution of commands that enumerates account or group information. Adversaries may use built-in applications to get a listing of local system or domain accounts and groups.

Rule type: eql

Rule indices:

• logs-endpoint.events.process-*

Severity: low

Risk score: 21

Runs every: 5m

Searches indices from: now-9m (https://www.elastic.co/guide/en/elasticsearch/reference/current/common-options.html#date-math[Date Math format], see also Additional look-back time)

Maximum alerts per execution: 100

References: None

Tags:

• Domain: Endpoint
• OS: Windows
• Use Case: Threat Detection
• Tactic: Discovery
• Rule Type: BBR
• Data Source: Elastic Defend

Version: 5

Rule authors:

• Elastic

Rule license: Elastic License v2

process where host.os.type == "windows" and event.type == "start" and
(
  (
   (
    (process.name : "net.exe" or process.pe.original_file_name == "net.exe") or
    (
     (process.name : "net1.exe" or process.pe.original_file_name == "net1.exe") and
     not process.parent.name : "net.exe"
    )
   ) and process.args : ("accounts", "group", "user", "localgroup") and not process.args : "/add"
  ) or
  (process.name:("dsquery.exe", "dsget.exe") and process.args:("*members*", "user")) or
  (process.name:"dsquery.exe" and process.args:"*filter*") or
  process.name:("quser.exe", "qwinsta.exe", "PsGetSID.exe", "PsLoggedOn.exe", "LogonSessions.exe", "whoami.exe") or
  (
    process.name: "cmd.exe" and
    (
      process.args : "echo" and process.args : (
        "%username%", "%userdomain%", "%userdnsdomain%",
        "%userdomain_roamingprofile%", "%userprofile%",
        "%homepath%", "%localappdata%", "%appdata%"
      ) or
      process.args : "set"
    )
  )
) and not process.parent.args: "C:\\Program Files (x86)\\Microsoft Intune Management Extension\\Content\\DetectionScripts\\*.ps1"
and not process.parent.name : "LTSVC.exe" and not user.id : "S-1-5-18"

Framework: MITRE ATT&CKTM

• Tactic:

  • Name: Discovery
  • ID: TA0007
  • Reference URL: https://attack.mitre.org/tactics/TA0007/

• Technique:

  • Name: Permission Groups Discovery
  • ID: T1069
  • Reference URL: https://attack.mitre.org/techniques/T1069/

• Sub-technique:

  • Name: Local Groups
  • ID: T1069.001
  • Reference URL: https://attack.mitre.org/techniques/T1069/001/

• Sub-technique:

  • Name: Domain Groups
  • ID: T1069.002
  • Reference URL: https://attack.mitre.org/techniques/T1069/002/

• Technique:

  • Name: Account Discovery
  • ID: T1087
  • Reference URL: https://attack.mitre.org/techniques/T1087/

• Sub-technique:

  • Name: Local Account
  • ID: T1087.001
  • Reference URL: https://attack.mitre.org/techniques/T1087/001/

• Sub-technique:

  • Name: Domain Account
  • ID: T1087.002
  • Reference URL: https://attack.mitre.org/techniques/T1087/002/

• Technique:

  • Name: Password Policy Discovery
  • ID: T1201
  • Reference URL: https://attack.mitre.org/techniques/T1201/