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

Suspicious Execution via Scheduled Task

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Suspicious Execution via Scheduled Task

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Identifies execution of a suspicious program via scheduled tasks by looking at process lineage and command line usage.

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
  • Persistence

Version: 100 (version history)

Added (Elastic Stack release): 7.11.0

Last modified (Elastic Stack release): 8.5.0

Rule authors: Elastic

Rule license: Elastic License v2

Potential false positives

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Legitimate scheduled tasks running third party software.

Investigation guide

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Rule query
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process where event.type == "start" and /* Schedule service
cmdline on Win10+ */ process.parent.name : "svchost.exe" and
process.parent.args : "Schedule" and /* add suspicious programs
here */ process.pe.original_file_name in
( "cscript.exe",
"wscript.exe", "PowerShell.EXE",
"Cmd.Exe", "MSHTA.EXE",
"RUNDLL32.EXE", "REGSVR32.EXE",
"MSBuild.exe", "InstallUtil.exe",
"RegAsm.exe", "RegSvcs.exe",
"msxsl.exe", "CONTROL.EXE",
"EXPLORER.EXE",
"Microsoft.Workflow.Compiler.exe",
"msiexec.exe" ) and /* add
suspicious paths here */ process.args : ( "C:\\Users\\*",
"C:\\ProgramData\\*", "C:\\Windows\\Temp\\*",
"C:\\Windows\\Tasks\\*", "C:\\PerfLogs\\*",
"C:\\Intel\\*", "C:\\Windows\\Debug\\*", "C:\\HP\\*")
and not (process.name : "cmd.exe" and process.args : "?:\\*.bat"
and process.working_directory : "?:\\Windows\\System32\\") and
not (process.name : "cscript.exe" and process.args :
"?:\\Windows\\system32\\calluxxprovider.vbs") and not
(process.name : "powershell.exe" and process.args : ("-File",
"-PSConsoleFile") and user.id : "S-1-5-18") and not (process.name
: "msiexec.exe" and user.id : "S-1-5-18")











Threat mapping
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Framework: MITRE ATT&CKTM














Rule version history
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Version 100 (8.5.0 release)








    

  • 

    Updated query, changed from:
    

    

    

    process where event.type == "start" and /* Schedule service
cmdline on Win10+ */ process.parent.name : "svchost.exe" and
process.parent.args : "Schedule" and /* add suspicious programs
here */ process.pe.original_file_name in
( "cscript.exe",
"wscript.exe", "PowerShell.EXE",
"Cmd.Exe", "MSHTA.EXE",
"RUNDLL32.EXE", "REGSVR32.EXE",
"MSBuild.exe", "InstallUtil.exe",
"RegAsm.exe", "RegSvcs.exe",
"msxsl.exe", "CONTROL.EXE",
"EXPLORER.EXE",
"Microsoft.Workflow.Compiler.exe",
"msiexec.exe" ) and /* add
suspicious paths here */ process.args : ( "C:\\Users\\*",
"C:\\ProgramData\\*", "C:\\Windows\\Temp\\*",
"C:\\Windows\\Tasks\\*", "C:\\PerfLogs\\*",
"C:\\Intel\\*", "C:\\Windows\\Debug\\*", "C:\\HP\\*")
    

    

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Version 7 (8.4.0 release)








    

  • 

    Updated query, changed from:
    

    

    

    process where event.type == "start" and /* Schedule service
cmdline on Win10+ */ process.parent.name : "svchost.exe" and
process.parent.args : "Schedule" and /* add suspicious programs
here */ process.pe.original_file_name in
( "cscript.exe",
"wscript.exe", "PowerShell.EXE",
"Cmd.Exe", "MSHTA.EXE",
"RUNDLL32.EXE", "REGSVR32.EXE",
"MSBuild.exe", "InstallUtil.exe",
"RegAsm.exe", "RegSvcs.exe",
"msxsl.exe", "CONTROL.EXE",
"EXPLORER.EXE",
"Microsoft.Workflow.Compiler.exe",
"msiexec.exe" ) and /* add
suspicious paths here */ process.args : ( "C:\\Users\\*",
"C:\\ProgramData\\*", "C:\\Windows\\Temp\\*",
"C:\\Windows\\Tasks\\*", "C:\\PerfLogs\\*",
"C:\\Intel\\*", "C:\\Windows\\Debug\\*", "C:\\HP\\*")
    

    

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Version 5 (8.2.0 release)








    

  • 
Formatting only

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Version 4 (7.16.0 release)








    

  • 
Formatting only

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Version 3 (7.12.0 release)








    

  • 
Formatting only

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Version 2 (7.11.2 release)








    

  • 
Formatting only

    • 




















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