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investigating-insider-threat-indicators

Investigates insider threat indicators using SIEM queries, DLP alerts, and HR data correlation.

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

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

SOC teams receiving insider threat referrals often lack a structured, legally sound methodology to investigate data exfiltration, unauthorized access, and anomalous employee behavior across fragmented log sources.

Core Features & Use Cases

  • Exfiltration Detection: Splunk SPL queries detect bulk SharePoint/OneDrive downloads, USB device usage, external email attachments, and cloud storage uploads.
  • Behavioral Anomaly Analysis: Identifies after-hours activity spikes, unauthorized application access, and deviations from role-based peer baselines.
  • HR and Physical Correlation: Aligns digital activity with resignation timelines, badge access logs, and notice periods to build investigation timelines.
  • Evidence Preservation: Python-based chain-of-custody logging with SHA-256 hashing for legally defensible evidence packages.
  • Use Case: When HR refers a departing employee with access to trade secrets, use this Skill to build a 90-day activity timeline, detect low-and-slow exfiltration under DLP thresholds, and produce an investigation report for Legal review.

Quick Start

Investigate user jsmith for insider threat indicators during their two-week notice period using our SIEM, DLP, and badge access logs.

Frequently Asked Questions about investigating-insider-threat-indicators

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

FAQPage Schema
How do I investigate a departing employee for data exfiltration?▼

Start with legal authorization and HR referral, then build a SIEM activity timeline across DLP, proxy, email, and endpoint logs. Query for bulk SharePoint downloads, USB device connections, external email attachments, and cloud storage uploads, correlating spikes against the resignation date.

How to detect low-and-slow data exfiltration that evades DLP alerts?▼

Aggregate file download counts over 60-90 days instead of per-day thresholds, comparing cumulative volume against same-role peer baselines. Attackers pulling 50-100 files daily stay under DLP limits but show clear cumulative deviation.

What log sources are needed for insider threat investigation?▼

You need SIEM-ingested DLP alerts, endpoint logs (Sysmon, EDR), email message traces, web proxy logs, authentication logs, and cloud activity (O365 management API). HR data feeds and physical badge logs complete the correlation picture.

Why does UEBA baseline comparison miss insider threats?▼

Baselines built during periods when the subject was already exfiltrating hide anomalies, and comparing against all-company averages masks role-abnormal access. Validate against a clean historical window and a true same-role peer cohort.

When should insider threat monitoring not be used?▼

Never begin monitoring without legal authorization coordinated with HR, Legal, and Privacy teams. Also validate findings against legitimate business justifications like sanctioned migrations before escalating, and exclude service accounts and backup jobs.

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