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GRRCON 2023
BRANDON DEVAULT
Principal Security Author
 Pluralsight
Cyber Operations
 Air National Guard
The Great Task Heist:
Stealing the Spotlight on
Scheduled Tasks
/in/brandon-devault @DeVaultSecurity
www.devaultsecurity.com
AGENDA
Introduction & Detection
PowerShell Analysis
Dashboard Analysis with Elastic
Q&A
PERSISTENCE TECHNIQUES
MITRE
Account Manipulation BITS Jobs
Boot or Logon Autostart
Execution
Boot or Logon
Initialization Scripts
Browser Extensions
Compromise Client
Software Binary
Create Account
Create or Modify
System Process
Event Triggered
Execution
External Remote
Services
Hijack Execution Flow Implant Internal Image
Modify Authentication
Process
Office Application
Startup
Pre-OS Boot
Scheduled Task/Job
Server Software
Component
Traffic Signaling Valid Accounts
PERSISTENCE TECHNIQUES
MITRE
SCHEDULED TASK / JOB
T1053.002 – At
T1053.003 – Cron
T1053.005 – Scheduled Task
T1053.006 – Systemd Timers
T1053.007 – Container Orchestration Job
*132 Named Threat Groups having used this persistence method
DETECTION
METHODS
Command Execution
• WMI, PowerShell, cmd …
Process Creation
Registry Key Creation
Log Detection!
• Sysmon
• Event ID: 4698, 4700, & 4701
File Modification
• %systemroot%Sytem32Tasks
POWERSHELL
ANALYSIS
DASHBOARD
ANALYSIS
WITH ELASTIC
EXPORT
JOURNEY
ATTEMPT #1
STEP 1
EXPORT THE TASKS (USING POWERSHELL)
$savefolder = "C:SomeFolder"
Get-ScheduledTask |
ForEach-Object {
$_.TaskName
Export-ScheduledTask -TaskName $_.TaskName -TaskPath $_.TaskPath |
Out-file (Join-Path $savefolder "$($_.TaskName).xml")
}
STEP 2
Convert to JSON (using Python)
import xmltodict, json, os
directory = '/some/directory/’
for filename in os.listdir(directory):
if filename.endswith(".xml"):
with open(filename, 'rb') as f:
XML_content = f.read()
x = xmltodict.parse(XML_content)
j = json.dumps(x)
print (filename)
filename = filename.replace('.xml', '')
output_file = open(filename + '.json', 'w')
output_file.write(j)
STEP 3
IMPORT!
Not a
Proper
NDJSON
Format
STEP 3
IMPORT!
Not a
Proper
NDJSON
Format
ATTEMPT #2
JSON TO NDJSON (USING JQ)
cat test.json | jq -c '.[]' > testNDJSON.json
IMPORT!
Multi-nested
Complex
JSON file
IMPORT!
Multi-nested
Complex
JSON file
ATTEMPT #3
CONVERT
JSON TO NDJSON (USING PYTHON)
< Super Awesome Code >
IMPORT!
Still too
Complex…
IMPORT!
Still too
Complex…
ATTEMPT #4
CREATE A
LOGSTASH PIPELINE
XML Parser
30 minutes later…
Task Scheduler schema:
658 lines…
ATTEMPT #5
CONVERT TO
CSV
Tool:
SaveJson2CSV
Gunamoi Software
IMPORT!
IMPORT!
ish...
QUESTIONS?
• www.devaultsecurity.com
• linkedin.
• twitter. devaultsecurity.com
• github.
• brandon-devault@pluralsight.com
• https://app.pluralsight.com/profile/author/
brandon-devault
• https://github.com/Oofles/scheduled-tasks
}

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