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System Time Discovery

Detects the usage of commonly used system time discovery techniques, which attackers may use during the reconnaissance phase after compromising a system.

Rule type: eql
Rule indices:

  • endgame-*
  • logs-endpoint.events.process-*
  • logs-system.security*
  • logs-windows.*
  • winlogbeat-*

Rule Severity: low
Risk Score: 21
Runs every:
Searches indices from: now-9m
Maximum alerts per execution: ?
References:

Tags:

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

Version: ?
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.name : "net1.exe" and not process.parent.name : "net.exe")) and
    process.args : "time" and not process.args : "/set"
 ) or
 (process.name: "w32tm.exe" and process.args: "/tz") or
 (process.name: "tzutil.exe" and process.args: "/g")
) and not user.id : ("S-1-5-18", "S-1-5-19", "S-1-5-20")

Framework: MITRE ATT&CK