Microsoft Build Engine Started an Unusual Process
Elastic Stack Serverless Security
An instance of MSBuild, the Microsoft Build Engine, started a PowerShell script or the Visual C# Command Line Compiler. This technique is sometimes used to deploy a malicious payload using the Build Engine.
Rule type: eql
Rule indices:
- winlogbeat-*
- logs-endpoint.events.*
- logs-windows.*
- endgame-*
Severity: low
Risk score: 21
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:
Tags:
- Elastic
- Host
- Windows
- Threat Detection
- Defense Evasion
- Elastic Endgame
Version: 102
Rule authors:
- Elastic
Rule license: Elastic License v2
process where event.type == "start" and
process.parent.name : "MSBuild.exe" and
process.name : ("csc.exe", "iexplore.exe", "powershell.exe")
Framework: MITRE ATT&CKTM
Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: Obfuscated Files or Information
- ID: T1027
- Reference URL: https://attack.mitre.org/techniques/T1027/
Sub-technique:
- Name: Compile After Delivery
- ID: T1027.004
- Reference URL: https://attack.mitre.org/techniques/T1027/004/