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Elastic Docs ›Elastic Security Solution [7.14] ›Detections and alerts ›Prebuilt rule reference

Net command via SYSTEM account

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Net command via SYSTEM account

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Identifies the SYSTEM account using an account discovery utility. This could be a sign of discovery activity after an adversary has achieved privilege escalation.

Rule type: eql

Rule indices:

  • winlogbeat-*
  • logs-endpoint.events.*
  • logs-windows.*

Severity: low

Risk score: 21

Runs every: 5 minutes

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

Maximum alerts per execution: 100

Tags:

  • Elastic
  • Host
  • Windows
  • Threat Detection
  • Discovery

Version: 7 (version history)

Added (Elastic Stack release): 7.7.0

Last modified (Elastic Stack release): 7.13.0

Rule authors: Elastic

Rule license: Elastic License v2

Rule query

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process where event.type in ("start", "process_started") and
user.id in ("S-1-5-18", "S-1-5-19", "S-1-5-20") and process.name :
"whoami.exe" or (process.name : "net1.exe" and not
process.parent.name : "net.exe")

Threat mapping

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Framework: MITRE ATT&CKTM

Rule version history

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Version 7 (7.13.0 release)

  • Updated query, changed from:

    event.category:process and event.type:(start or process_started) and
(process.name:(whoami.exe or net.exe) or process.name:net1.exe and not
process.parent.name:net.exe) and user.name:SYSTEM
Version 6 (7.12.0 release)
  • Formatting only
Version 5 (7.11.2 release)
  • Formatting only
Version 4 (7.10.0 release)

  • Updated query, changed from:

    event.category:process and event.type:(start or process_started) and
(process.name:net.exe or process.name:net1.exe and not
process.parent.name:net.exe) and user.name:SYSTEM
Version 3 (7.9.1 release)
  • Formatting only
Version 2 (7.9.0 release)

  • Updated query, changed from:

    (process.name:net.exe or process.name:net1.exe and not
process.parent.name:net.exe) and user.name:SYSTEM and
event.action:"Process Create (rule: ProcessCreate)"
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