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detecting-insider-threat-behaviors

Detect insider threat behaviors using SIEM, EDR, and UEBA telemetry queries.

954|172|Updated Mar 13, 2026
Search Tags:#detection#threat hunting#data exfiltration#siem#mitre attack#insider threat#UEBA
One-click install
npx skills add https://github.com/xalgord/xalgorix --skill detecting-insider-threat-behaviors
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: detecting-insider-threat-behaviors
Source: https://github.com/xalgord/xalgorix/tree/main/internal/tools/skills/data/threat-hunting/detecting-insider-threat-behaviors
Command: npx skills add https://github.com/xalgord/xalgorix --skill detecting-insider-threat-behaviors

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Security teams struggle to spot malicious insiders because their activity often looks authorized, and network-only monitoring misses high-signal exfiltration channels like USB copies, printing, and personal cloud uploads.

Core Features & Use Cases

  • Hypothesis-Driven Hunting: A seven-step workflow from hypothesis formulation through query execution, validation, and reporting.
  • Behavioral Detection Coverage: Detects unusual data access, off-hours activity, mass downloads, privilege abuse, and resignation-correlated data theft mapped to MITRE ATT&CK techniques T1078, T1530, and T1567.
  • Detection Gap Guidance: Documents blind spots such as low-and-slow staging, per-user off-hours baselines, and privileged scope creep, with tuning advice for false positives.
  • Use Case: An analyst hunting for an employee staging files before resignation correlates Windows Security events 4663/6416, DLP alerts, and HR signals to confirm bulk reads to USB and personal cloud storage.

Quick Start

Hunt for insider threat indicators by correlating per-user file access, removable media, and cloud upload telemetry against HR signals such as recent resignations.

Frequently Asked Questions about detecting-insider-threat-behaviors

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I detect insider threats with SIEM and EDR tools?▼

Formulate a hypothesis, then run queries in Splunk, Sentinel, or CrowdStrike against process, network, and object-access telemetry. Correlate Windows events 4663 and 6416 with DLP alerts and validate findings against per-user baselines before escalating.

What MITRE ATT&CK techniques indicate insider data theft?▼

Key techniques include T1078 (Valid Accounts), T1530 (Data from Cloud Storage Object), and T1567 (Exfiltration Over Web Service). These cover misuse of legitimate credentials and exfiltration to personal cloud services.

Why do network logs miss insider exfiltration?▼

Network-only monitoring cannot see USB mass copies, local printing, or screen photography, which are the highest-signal exfil channels. You need removable-media telemetry, DLP, and CASB data with per-user behavioral baselines.

How do I reduce false positives in off-hours activity alerts?▼

Use per-user UEBA baselines instead of a single org-wide after-hours rule, which floods shift workers and global teams with false positives. Also allowlist service accounts, backup jobs, and sync clients like OneDrive before alerting.

What telemetry is required for insider threat hunting?▼

You need an EDR platform with process and network telemetry, a SIEM with ingested logs, Sysmon with a comprehensive configuration, and Windows Security Event Log forwarding. Threat intelligence feeds help correlate indicators of compromise.

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