Should you build or buy Insider Risk Management?
Insider risk management software watches for data exfiltration, privilege misuse and policy violations by employees and contractors, combining endpoint telemetry, file-lineage tracking and HR events like resignations into case workflows investigators can act on. Security and compliance teams use it to catch departing-employee data theft and insider fraud before it causes damage.
Buy the endpoint and evidence layer, starting with Purview if you are Microsoft-centric and licensed for it, or a specialist where file lineage and privacy controls matter. Build the high-value scenarios in your SIEM on top of that telemetry if you own reliable data and can staff the tuning and investigations. Compare specialist quotes against the full cost of engineering plus sustained case handling, not software price alone.
Build it, buy it, or bridge?
When building makes sense
In-house detection work does happen, but it stops short of the full case. Security teams regularly build user and entity behavior analytics inside their own SIEM to flag unusual data movement, and that automation can meaningfully cut the manual investigation time a security team otherwise spends chasing insider alerts. Neither that work nor any other published self-build replaces the pieces DTEX, Proofpoint and Incydr sell: an endpoint agent, file-lineage capture that survives a departing employee wiping local history, and pseudonymization controls that keep an investigation legally defensible. No named company has published a production system covering all three. Build the SIEM-side detection and case triage if your team already runs strong telemetry and can staff the tuning, since that half is genuinely within reach, but expect to still need a bought agent for the evidence a court or HR case eventually requires.
When buying makes sense
Buy the endpoint and evidence layer, and start with Microsoft Purview if you are Microsoft-centric and already licensed for E5, since the incremental cost there is close to zero. For non-Microsoft estates or where file lineage and privacy controls matter more, DTEX, Proofpoint ITM and Mimecast's Incydr each bundle the agent, HR leaver integrations and case management a SIEM alone does not provide. Okta runs Incydr in production rather than a self-built equivalent. Build the high-value detection scenarios on top of that bought telemetry in your SIEM if you own reliable data and can staff ongoing tuning, but compare a specialist's quote against the full cost of engineering plus sustained case handling, not against software price alone. The obligation is the same at every company, and nobody wins a customer on catching insider fraud.
The desk read
Build-versus-buy analysis for Insider Risk Management is being written. In the meantime, the framework that drives every B4 call is on the B4 Index page.
Frequently asked
Can we detect insider threats with our existing SIEM alone?
Partially. Teams have built working UEBA detection pipelines directly in their SIEM that automate what used to be a slow manual review, but that covers alerting, not the endpoint file-lineage capture or pseudonymization controls that make an investigation defensible in an HR or legal proceeding. Most teams still need a bought agent for that layer.
Is Microsoft Purview enough, or do we need a specialist?
Purview covers Microsoft 365 signals well and is bundled into an E5 license, but it depends on Defender for Endpoint and fits poorly in non-Microsoft estates. A specialist like DTEX or Proofpoint makes more sense once your data lives outside the Microsoft stack.
What is the actual cost of getting insider risk detection wrong?
Under-tuned monitoring routinely produces far more alerts than a security team can review. Analysts end up triaging a flood of noise instead of the handful of alerts that actually matter. The cost is analyst time, not just software, whichever path you choose.
Does this overlap with data loss prevention (DLP) tools?
They're related but distinct. DLP blocks or flags data leaving a defined perimeter based on content rules; insider risk management adds behavioral baselines, HR context like resignations, and case investigation workflow on top. Many buyers run both.