Microsoft Build Engine Using an Alternate Nameedit
An instance of MSBuild, the Microsoft Build Engine, was started after being renamed. This is uncommon behavior and may indicate an attempt to run unnoticed or undetected.
Rule type: eql
Rule indices:
- winlogbeat-*
- logs-endpoint.events.*
- logs-windows.*
Severity: low
Risk score: 21
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: 101 (version history)
Added (Elastic Stack release): 7.7.0
Last modified (Elastic Stack release): 8.5.0
Rule authors: Elastic
Rule license: Elastic License v2
Potential false positivesedit
The Build Engine is commonly used by Windows developers but use by non-engineers is unusual.
Investigation guideedit
Rule queryedit
process where event.type == "start" and process.pe.original_file_name == "MSBuild.exe" and not process.name : "MSBuild.exe"
Threat mappingedit
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
-
Technique:
- Name: Masquerading
- ID: T1036
- Reference URL: https://attack.mitre.org/techniques/T1036/
Rule version historyedit
- Version 101 (8.5.0 release)
-
-
Updated query, changed from:
process where event.type in ("start", "process_started") and process.pe.original_file_name == "MSBuild.exe" and not process.name : "MSBuild.exe"
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- Version 12 (8.4.0 release)
-
- Formatting only
- Version 10 (8.2.0 release)
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- Formatting only
- Version 9 (7.16.0 release)
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- Formatting only
- Version 8 (7.13.0 release)
-
-
Updated query, changed from:
event.category:process and event.type:(start or process_started) and process.pe.original_file_name:MSBuild.exe and not process.name: MSBuild.exe
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- Version 7 (7.12.0 release)
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- Formatting only
- Version 6 (7.11.2 release)
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- Formatting only
- Version 5 (7.11.0 release)
-
-
Updated query, changed from:
event.category:process and event.type:(start or process_started) and (process.pe.original_file_name:MSBuild.exe or winlog.event_data.OriginalFileName:MSBuild.exe) and not process.name: MSBuild.exe
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- Version 4 (7.10.0 release)
-
-
Updated query, changed from:
event.category:process and event.type:(start or process_started) and (pe.original_file_name:MSBuild.exe or winlog.event_data.OriginalFileName:MSBuild.exe) and not process.name: MSBuild.exe
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- Version 3 (7.9.1 release)
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- Formatting only
- Version 2 (7.9.0 release)
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Updated query, changed from:
(pe.original_file_name:MSBuild.exe or winlog.event_data.OriginalFileName: MSBuild.exe) and not process.name: MSBuild.exe and event.action: "Process Create (rule: ProcessCreate)"
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