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Elastic Docs ›Elastic Security Solution [8.5] ›Detections and alerts ›Prebuilt rule reference

Suspicious .NET Code Compilation

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Suspicious .NET Code Compilation

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Identifies suspicious .NET code execution. connections.

Rule type: eql

Rule indices:

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

Severity: medium

Risk score: 47

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): 7.10.0

Last modified (Elastic Stack release): 8.5.0

Rule authors: Elastic

Rule license: Elastic License v2

Investigation guide

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Rule query
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process where event.type == "start" and process.name : ("csc.exe",
"vbc.exe") and process.parent.name : ("wscript.exe", "mshta.exe",
"cscript.exe", "wmic.exe", "svchost.exe", "rundll32.exe", "cmstp.exe",
"regsvr32.exe")











Threat mapping
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Framework: MITRE ATT&CKTM














Rule version history
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Version 101 (8.5.0 release)








    

  • 

    Updated query, changed from:
    

    

    

    process where event.type in ("start", "process_started") and
process.name : ("csc.exe", "vbc.exe") and process.parent.name :
("wscript.exe", "mshta.exe", "cscript.exe", "wmic.exe", "svchost.exe",
"rundll32.exe", "cmstp.exe", "regsvr32.exe")
    

    

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Version 8 (8.4.0 release)








    

  • 
Formatting only

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Version 6 (8.2.0 release)








    

  • 
Formatting only

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Version 5 (7.16.0 release)








    

  • 
Formatting only

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Version 4 (7.12.0 release)








    

  • 
Formatting only

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Version 3 (7.11.2 release)








    

  • 
Formatting only

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Version 2 (7.11.0 release)








    

  • 

    Updated query, changed from:
    

    

    

    event.category:process and event.type:(start or process_started) and
process.name:(csc.exe or vbc.exe) and process.parent.name:(wscript.exe
or mshta.exe or wscript.exe or wmic.exe or svchost.exe or rundll32.exe
or cmstp.exe or regsvr32.exe)
    

    

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