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Elastic Docs ›Elastic Security Solution [8.16] ›Detections and alerts ›Prebuilt rule reference

Suspicious CertUtil Commands

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Suspicious CertUtil Commands

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Identifies suspicious commands being used with certutil.exe. CertUtil is a native Windows component which is part of Certificate Services. CertUtil is often abused by attackers to live off the land for stealthier command and control or data exfiltration.

Rule type: eql

Rule indices:

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

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

References:

Tags:

  • Elastic
  • Host
  • Windows
  • Threat Detection
  • Defense Evasion
  • Elastic Endgame

Version: 101 (version history)

Added (Elastic Stack release): 7.6.0

Last modified (Elastic Stack release): 8.6.0

Rule authors: Elastic, Austin Songer

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 :
"certutil.exe" or process.pe.original_file_name == "CertUtil.exe") and
process.args : ("?decode", "?encode", "?urlcache", "?verifyctl",
"?encodehex", "?decodehex", "?exportPFX")











Threat mapping
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Framework: MITRE ATT&CKTM














Rule version history
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Version 101 (8.6.0 release)








    

  • 
Formatting only

    • 









Version 100 (8.5.0 release)








    

  • 
Formatting only

    • 









Version 16 (8.4.0 release)








    

  • 

    Updated query, changed from:
    

    

    

    process where event.type == "start" and (process.name :
"certutil.exe" or process.pe.original_file_name == "CertUtil.exe") and
process.args : ("?decode", "?encode", "?urlcache", "?verifyctl",
"?encodehex", "?decodehex", "?exportPFX")
    

    

    • 









Version 14 (8.3.0 release)








    

  • 
Formatting only

    • 









Version 12 (8.2.0 release)








    

  • 
Formatting only

    • 









Version 10 (8.0.0 release)








    

  • 

    Updated query, changed from:
    

    

    

    process where event.type == "start" and (process.name :
"certutil.exe" or process.pe.original_file_name == "CertUtil.exe") and
process.args : ("?decode", "?encode", "?urlcache", "?verifyctl",
"?encodehex", "?decodehex")
    

    

    • 









Version 9 (7.14.0 release)








    

  • 
Rule name changed from: Encoding or Decoding Files via CertUtil

    • 

  • 

    Updated query, changed from:
    

    

    

    process where event.type == "start" and (process.name :
"certutil.exe" or process.pe.original_file_name == "CertUtil.exe") and
process.args : ("?decode", "?encode")
    

    

    • 









Version 8 (7.13.0 release)








    

  • 

    Updated query, changed from:
    

    

    

    event.category:process and event.type:(start or process_started) and
process.name:certutil.exe and process.args:(-decode or -encode or
/decode or /encode)
    

    

    • 









Version 7 (7.12.0 release)








    

  • 
Formatting only

    • 









Version 6 (7.11.2 release)








    

  • 
Formatting only

    • 









Version 5 (7.10.0 release)








    

  • 
Formatting only

    • 









Version 4 (7.9.1 release)








    

  • 
Formatting only

    • 









Version 3 (7.9.0 release)








    

  • 

    Updated query, changed from:
    

    

    

    event.action:"Process Create (rule: ProcessCreate)" and
process.name:certutil.exe and process.args:(-decode or -encode or
/decode or /encode)
    

    

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Version 2 (7.7.0 release)








    

  • 

    Updated query, changed from:
    

    

    

    event.action:"Process Create (rule: ProcessCreate)" and
process.name:"certutil.exe" and process.args:("-encode" or "/encode"
or "-decode" or "/decode")
    

    

    • 




















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