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MsBuild Making Network Connectionsedit

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: 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
  • Defense Evasion

Version: 100 (version history)

Added (Elastic Stack release): 7.6.0

Last modified (Elastic Stack release): 8.5.0

Rule authors: Elastic

Rule license: Elastic License v2

Rule queryedit

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")]

Threat mappingedit

Framework: MITRE ATT&CKTM

Rule version historyedit

Version 100 (8.5.0 release)
  • Formatting only
Version 9 (8.4.0 release)
  • Formatting only
Version 8 (7.16.0 release)
  • Formatting only
Version 7 (7.12.0 release)
  • Formatting only
Version 6 (7.11.0 release)
  • Formatting only
Version 5 (7.10.0 release)

  • Updated query, changed from:

    event.category:network and event.type:connection and
process.name:MSBuild.exe and not destination.ip:(127.0.0.1 or "::1")
Version 4 (7.9.1 release)
  • Formatting only
Version 3 (7.9.0 release)

  • Updated query, changed from:

    event.action:"Network connection detected (rule: NetworkConnect)" and
process.name:MSBuild.exe and not destination.ip:(127.0.0.1 or "::1")
Version 2 (7.7.0 release)

  • Updated query, changed from:

    event.action:"Network connection detected (rule: NetworkConnect)" and
process.name:MSBuild.exe and not destination.ip:("127.0.0.1" or "::1")
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