Build detection rules for suspicious Windows scheduled tasks by correlating Sysmon and Windows Security logs. Examine parent processes, file paths, encoded commands, and remote task creation to uncover persistent access and movement between systems.
Detect malicious scheduled task creation and modification using Sysmon Event IDs 1 (Process Create for schtasks.exe), 11 (File Create for task XML), and Windows Security Event 4698/4702. The analyst correlates task creation with suspicious parent processes, public directory paths, and encoded command arguments to identify persistence and lateral movement via scheduled tasks. Activates for requests involving scheduled task detection, Sysmon persistence hunting, or T1053.005 Scheduled Task/Job analysis.
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Adversaries abuse Windows Task Scheduler (schtasks.exe, at.exe) for persistence (T1053.005) and lateral movement. Sysmon Event ID 1 captures schtasks.exe process creation with full command-line arguments, while Event ID 11 captures task XML files written to C:\Windows\System32\Tasks. Windows Security Event 4698 logs task registration details. This skill covers building detection rules that correlate these events to identify malicious scheduled tasks created from suspicious paths, with encoded payloads, or targeting remote systems.
[CRITICAL] Suspicious Scheduled Task Detected
Task: \Microsoft\Windows\UpdateCheck
Command: powershell.exe -enc SQBuAHYAbwBrAGUALQBXAGUAYgBSAGU...
Created By: DOMAIN\compromised_user
Parent Process: cmd.exe (PID 4532)
Source: \\192.168.1.50 (remote creation)
MITRE: T1053.005 - Scheduled Task/Job
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