File Integrity Management (FIM)

Security+ 🏆 • Security Operations 🛡️ • Vulnerabilities 🚨 • Difficulty: premium

Definition

File Integrity Management monitors files and critical system objects for unexpected changes. It establishes a trusted baseline and alerts when files are modified, added, deleted, or when permissions change, helping detect tampering, malware, and unauthorized configuration changes.

Examples

  • A server FIM policy watches system binaries and configuration files. When a web server config is altered outside the change window, the SOC is alerted.
  • A payment system uses FIM to meet compliance by proving key files and logs have not been modified without authorization.

Discover 🔎

Many attacks succeed by changing something small that defenders do not notice. A single modified configuration file can weaken authentication. A new scheduled task can create persistence. A replaced system binary can hide malware. File Integrity Management helps by watching the places that matter and telling you when something changes. It is especially valuable on servers and critical systems where changes should be rare, intentional, and traceable.

Remember: FIM is not about watching every file. It is about watching the right files and making unexpected change visible.
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