persistence_scheduled_task_updated.toml

[metadata]
creation_date = "2022/08/29"
integration = ["system", "windows"]
maturity = "production"
updated_date = "2024/05/21"

[rule]
author = ["Elastic"]
description = """
Indicates the update of a scheduled task using Windows event logs. Adversaries can use these to establish persistence,
by changing the configuration of a legit scheduled task. Some changes such as disabling or enabling a scheduled task are
common and may may generate noise.
"""
false_positives = ["Legitimate scheduled tasks may be created during installation of new software."]
from = "now-9m"
index = ["winlogbeat-*", "logs-system.*", "logs-windows.*"]
language = "eql"
license = "Elastic License v2"
name = "A scheduled task was updated"
references = ["https://docs.microsoft.com/en-us/windows/security/threat-protection/auditing/event-4698"]
risk_score = 47
rule_id = "a02cb68e-7c93-48d1-93b2-2c39023308eb"
severity = "medium"
tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Persistence"]
timestamp_override = "event.ingested"
type = "eql"

query = '''
iam where event.action == "scheduled-task-updated" and

 /* excluding tasks created by the computer account */
 not user.name : "*$" and 
 not winlog.event_data.TaskName : "*Microsoft*" and 
 not winlog.event_data.TaskName :
          ("\\User_Feed_Synchronization-*",
           "\\OneDrive Reporting Task-S-1-5-21*",
           "\\OneDrive Reporting Task-S-1-12-1-*",
           "\\Hewlett-Packard\\HP Web Products Detection",
           "\\Hewlett-Packard\\HPDeviceCheck", 
           "\\Microsoft\\Windows\\UpdateOrchestrator\\UpdateAssistant", 
           "\\IpamDnsProvisioning",  
           "\\Microsoft\\Windows\\UpdateOrchestrator\\UpdateAssistantAllUsersRun", 
           "\\Microsoft\\Windows\\UpdateOrchestrator\\UpdateAssistantCalendarRun", 
           "\\Microsoft\\Windows\\UpdateOrchestrator\\UpdateAssistantWakeupRun", 
           "\\Microsoft\\Windows\\.NET Framework\\.NET Framework NGEN v*", 
           "\\Microsoft\\VisualStudio\\Updates\\BackgroundDownload") and 
  not winlog.event_data.SubjectUserSid :  ("S-1-5-18", "S-1-5-19", "S-1-5-20")
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1053"
name = "Scheduled Task/Job"
reference = "https://attack.mitre.org/techniques/T1053/"
[[rule.threat.technique.subtechnique]]
id = "T1053.005"
name = "Scheduled Task"
reference = "https://attack.mitre.org/techniques/T1053/005/"



[rule.threat.tactic]
id = "TA0003"
name = "Persistence"
reference = "https://attack.mitre.org/tactics/TA0003/"