Host-based Intrusion Detection System (HIDS)

Security+ 🏆 • Security Operations 🛡️ • Difficulty: premium

Definition

A Host-based Intrusion Detection System monitors activity on a single host such as a server or workstation to detect suspicious behavior or policy violations. It typically collects and analyzes logs, file integrity changes, and system events, then generates alerts when it sees signs of intrusion.

Examples

  • A HIDS alerts when a new administrator account is created on a critical server outside of an approved change window.
  • A server HIDS detects that a system binary has changed unexpectedly and flags potential tampering.

Discover 🔎

Many attacks leave their clearest evidence on the endpoint they compromise. New accounts, new services, altered configurations, suspicious logons, and changed files often show up first on the host. A Host-based Intrusion Detection System focuses on that local perspective. It helps you spot suspicious changes on a specific machine, even when network tools cannot see the full story.

Remember: HIDS is host-focused. It watches what happens on the machine itself, not just traffic moving across the network.
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