IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

« Microsoft Build Engine Using an Alternate Name Potential DLL SideLoading via Trusted Microsoft Programs »

› ›

Microsoft Build Engine Started an Unusual Process

edit

Microsoft Build Engine Started an Unusual Process

edit

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: new_terms

Rule indices:

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

Severity: low

Risk score: 21

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

https://blog.talosintelligence.com/2020/02/building-bypass-with-msbuild.html

Tags:

Domain: Endpoint
OS: Windows
Use Case: Threat Detection
Tactic: Defense Evasion
Tactic: Execution
Data Source: Elastic Defend

Version: 206

Rule authors:

Elastic

Rule license: Elastic License v2

Investigation guide

edit

Rule query

edit

host.os.type:windows and event.category:process and event.type:start and process.parent.name:"MSBuild.exe" and
process.name.caseless:("csc.exe" or "iexplore.exe" or "powershell.exe")

Framework: MITRE ATT&CK^TM

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/

« Microsoft Build Engine Using an Alternate Name Potential DLL SideLoading via Trusted Microsoft Programs »