MsBuild Making Network Connections

Identifies MsBuild.exe making outbound network connections. This may indicate adversarial activity as MsBuild is often leveraged by adversaries to execute code and evade detection.

Rule type: eql

Rule indices:

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

Severity: medium

Risk score: 47

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:

• Elastic
• Host
• Windows
• Threat Detection
• Defense Evasion

Version: 101

Rule authors:

• Elastic

Rule license: Elastic License v2

sequence by process.entity_id
  [process where process.name : "MSBuild.exe" and event.type == "start"]
  [network where process.name : "MSBuild.exe" and
     not cidrmatch(destination.ip, "127.0.0.1", "::1")]

Framework: MITRE ATT&CKTM

• Tactic:

  • Name: Defense Evasion
  • ID: TA0005
  • Reference URL: https://attack.mitre.org/tactics/TA0005/

• Technique:

  • Name: Trusted Developer Utilities Proxy Execution
  • ID: T1127
  • Reference URL: https://attack.mitre.org/techniques/T1127/

• Sub-technique:

  • Name: MSBuild
  • ID: T1127.001
  • Reference URL: https://attack.mitre.org/techniques/T1127/001/