defense_evasion_msbuild_making_network_connections.toml

[metadata]
creation_date = "2020/02/18"
maturity = "production"
updated_date = "2021/09/23"

[rule]
author = ["Elastic"]
description = """
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.
"""
from = "now-9m"
index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*"]
language = "eql"
license = "Elastic License v2"
name = "MsBuild Making Network Connections"
risk_score = 47
rule_id = "0e79980b-4250-4a50-a509-69294c14e84b"
severity = "medium"
tags = ["Elastic", "Host", "Windows", "Threat Detection", "Defense Evasion"]
type = "eql"

query = '''
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")]
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1127"
name = "Trusted Developer Utilities Proxy Execution"
reference = "https://attack.mitre.org/techniques/T1127/"

  [[rule.threat.technique.subtechnique]]
  id = "T1127.001"
  name = "MSBuild"
  reference = "https://attack.mitre.org/techniques/T1127/001/"


[rule.threat.tactic]
id = "TA0005"
name = "Defense Evasion"
reference = "https://attack.mitre.org/tactics/TA0005/"