<h2>The Insider Threat Problem</h2><p>Insider threats are uniquely challenging because the attacker bypasses perimeter controls entirely — they already have legitimate access to your systems, data, and facilities. Detection relies on identifying anomalous behaviour against a baseline of normal activity, which requires both technical controls and human judgement.</p><p>The Ponemon Institute's Cost of Insider Threats report consistently finds that insider incidents take longer to detect and cost more to remediate than external attacks.</p><h2>Categories of Insider Threat</h2><p>Not all insider threats are malicious. The three main categories are:</p><ul><li><strong>Malicious insiders</strong> — employees or contractors who intentionally steal data, commit sabotage, or facilitate external attacks</li><li><strong>Negligent insiders</strong> — employees who inadvertently expose data through poor security hygiene, misconfiguration, or falling for phishing attacks</li><li><strong>Compromised insiders</strong> — employees whose credentials or devices have been taken over by an external attacker</li></ul><h2>Behavioural Indicators to Monitor</h2><p>The following behaviours, particularly in combination, warrant investigation:</p><ul><li>Bulk downloads of sensitive data, especially outside business hours</li><li>Access to systems or data outside the employee's normal job function</li><li>Repeated failed access attempts to restricted resources</li><li>USB device insertions, particularly on endpoints with sensitive data</li><li>Large email attachments sent to personal email addresses or external domains</li><li>Anomalous cloud storage uploads (OneDrive, Dropbox, Google Drive)</li><li>Printing of sensitive documents in unusual volumes</li><li>VPN access from unusual geographic locations or at unusual times</li></ul><h2>Technical Controls for Detection</h2><p>Effective insider threat detection requires a layered approach:</p><ul><li><strong>User and Entity Behaviour Analytics (UEBA)</strong> — baseline normal behaviour and alert on deviations</li><li><strong>Data Loss Prevention (DLP)</strong> — monitor and control data movement across email, web, USB, and cloud</li><li><strong>Privileged Access Management (PAM)</strong> — record and monitor all privileged user sessions</li><li><strong>Cloud Access Security Broker (CASB)</strong> — visibility into cloud application usage and data movement</li></ul><h2>Investigation Considerations</h2><p>Insider threat investigations require careful coordination with HR and legal counsel before any overt action. Evidence must be collected in a forensically sound manner to preserve admissibility. SpiderIQ's DF&IR team has extensive experience conducting covert insider threat investigations that meet the evidentiary standards required for disciplinary proceedings and criminal referrals.</p>