Investigating Insider Threat Indicators

Investigating Insider Threat Indicators

Overview

Cybersecurity skill for investigating insider threat indicators. Follows industry best practices and security standards.

When to Use

Trigger phrases:

• "investigating insider threat indicators"
• "HR refers a departing employee for monitoring during their notice period"
• "DLP alerts indicate bulk data downloads or transfers to personal storage"
• "UEBA detects anomalous access patterns deviating significantly from peer baselin"

Use this skill when:

• HR refers a departing employee for monitoring during their notice period
• DLP alerts indicate bulk data downloads or transfers to personal storage
• UEBA detects anomalous access patterns deviating significantly from peer baselines
• Management reports concerns about an employee accessing sensitive data outside their role

Do not use without proper legal authorization — insider threat investigations must be coordinated with HR, Legal, and Privacy teams before monitoring begins.

When NOT to Use

• When you lack proper authorization for testing
• For production systems without change management
• When the task requires legal or compliance expertise beyond technical scope

Prerequisites

• Legal authorization and HR referral documenting investigation justification
• SIEM with DLP, endpoint, email, proxy, and authentication log sources
• Data Loss Prevention (DLP) system (Microsoft Purview, Symantec, Forcepoint) with policy alerts
• Endpoint monitoring capability (EDR with USB/removable media logging)
• HR data feed providing employment status, notice dates, and access entitlements
• Chain of custody procedures for evidence preservation

Workflow

# Example: IOC detection
import re

IOC_PATTERNS = {
    "ip": r"\b(?:\d{1,3}\.){3}\d{1,3}\b",
    "domain": r"\b[a-z0-9-]+\.[a-z]{2,}\b",
    "hash_md5": r"\b[a-f0-9]{32}\b",
    "hash_sha256": r"\b[a-f0-9]{64}\b",
}

def extract_iocs(text: str) -> dict:
    return {k: re.findall(v, text) for k, v in IOC_PATTERNS.items()}

1. Define Objectives — Clarify the goals and scope for insider threat indicators.
2. Gather Resources — Collect tools, data, and access needed for insider threat indicators.
3. Execute Process — Carry out insider threat indicators operations methodically.
4. Verify Quality — Check results against acceptance criteria.
5. Document Outcomes — Record findings, decisions, and next steps.

Tools

• Analysis Platform — Data processing and visualization
• Collaboration Tools — Team coordination and knowledge sharing

Process

1. Prepare — Gather requirements, verify prerequisites, set up environment
2. Execute — Run investigating insider threat indicators workflow with configured parameters
3. Verify — Validate output meets requirements, document results

Verification

• All insider threat indicators procedures executed completely and documented
• Findings validated against multiple data sources
• False positives identified and filtered
• Results documented with evidence and timestamps
• Recommendations provided with risk-based prioritization

Anti-Rationalization Table