seikaikyo/detecting-malicious-scheduled-tasks-with-sysmon
external/anthropic-cybersecurity-skills/skills/detecting-malicious-scheduled-tasks-with-sysmon/SKILL.md
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.
$ install --global
skillsauthnpx skillsauth add seikaikyo/dash-skills detecting-malicious-scheduled-tasks-with-sysmonInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
3
Scanners Passed
9
Scanners in report
Clean
TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
Skipped
Socket.devSupply chain security analysis
50%
Skipped
VirusTotalMulti-engine malware detection
50%
Skipped
CrowdStrikeAdvanced threat intelligence
50%
Skipped
OSV-ScannerOpen Source Vulnerability database check
50%
Skipped
OWASP Dep-Check
50%
Last scanned: Jun 6, 2026, 5:16 AM159.3s3 files scanned
SKILL.md
- name:
- detecting-malicious-scheduled-tasks-with-sysmon
- description:
- Detect malicious scheduled task creation and modification using Sysmon
- domain:
- cybersecurity
- subdomain:
- threat-hunting
- version:
- 1.0
- author:
- mahipal
- license:
- Apache-2.0
Detecting Malicious Scheduled Tasks with Sysmon
Overview
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.
When to Use
- When investigating security incidents that require detecting malicious scheduled tasks with sysmon
- When building detection rules or threat hunting queries for this domain
- When SOC analysts need structured procedures for this analysis type
- When validating security monitoring coverage for related attack techniques
Prerequisites
- Sysmon installed with a detection-focused configuration (e.g., SwiftOnSecurity or Olaf Hartong)
- Windows Event Log forwarding to SIEM (Splunk, Elastic, or Sentinel)
- PowerShell ScriptBlock Logging enabled (Event 4104)
Steps
- Configure Sysmon to log Event IDs 1, 11, 12, 13 with task-related filters
- Build detection rules for schtasks.exe /create with suspicious arguments
- Correlate Event 4698 (task registered) with Sysmon Event 1 (process create)
- Hunt for tasks executing from public directories or with encoded commands
- Alert on remote task creation (schtasks /s) for lateral movement detection
Expected Output
[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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