Microsoft Build Engine Suspicious Parent Process (Sysmon)

id: '32492.57742'
title: Microsoft Build Engine Suspicious Parent Process
description: Adversaries may take advantage of trusted developer utilities to proxy
  execution of malicious payloads. There are many utilities used for software development
  related tasks that can be used to execute code in various forms to assist in development,
  debugging, and reverse engineering. These utilities may often be signed with legitimate
  certificates that allow them to execute on a system and proxy execution of malicious
  code through a trusted process that effectively bypasses application control solutions.
  This use case detects msbuild.exe spawned by a scripting interpreter (such as CMD,
  PowerShell, etc.).
logic_format: Splunk
logic: '`get_endpoint_data` `get_endpoint_data_sysmon` (TERM(EventCode=1) OR "<EventID>1<")
  ("msbuild.exe" OR TERM(msbuild)) ("cmd.exe" OR "powershell.exe" OR "pwsh.exe" OR
  "powershell_ise.exe" OR "cscript.exe" OR "wscript.exe" OR "mshta.exe") | regex process_name="(?i)msbuild\.exe"|
  regex parent_process_name="(?i)(cmd|powershell(_ise)?|pwsh|cscript|wscript|mshta)\.exe"
  | table _time, host, user, process, process_*, parent_* | bin span=1s | stats values(*)
  as * by _time, host '
techniques:
- execution:command and scripting interpreter:powershell
- defense-evasion:trusted developer utilities proxy execution:msbuild
- execution:command and scripting interpreter
- defense-evasion:trusted developer utilities proxy execution
- execution:command and scripting interpreter:visual basic
- execution:command and scripting interpreter:windows command shell
technique_id:
- T1059.001
- T1127.001
- T1059
- T1127
- T1059.005
- T1059.003
data_category:
- Windows Sysmon
references:
- https://attack.mitre.org/techniques/T1127/
- https://attack.mitre.org/techniques/T1127/001/
- https://attack.mitre.org/techniques/T1059/
- https://attack.mitre.org/techniques/T1059/001/
- https://attack.mitre.org/techniques/T1059/003/
- https://attack.mitre.org/techniques/T1059/005/
- https://detection.fyi/elastic/detection-rules/windows/defense_evasion_execution_msbuild_started_by_script/?query=msbuild