Managing Antivirus Exclusions Safely

Antivirus exclusions tell the antivirus engine to skip scanning certain files, folders, or processes. They're sometimes necessary when AV causes performance issues or false positives (blocking legitimate software). However, exclusions are also exploited by malware — attackers drop malware in excluded paths to evade detection. Legitimate reasons for exclusions: database files that AV's real-time scanning causes performance issues with (SQL Server data files, Exchange mailbox databases), backup agent executables that conflict with AV, or development tools (Visual Studio build directories) that trigger false positives. Best practices: minimize exclusions to only what's demonstrably necessary. Use process exclusions rather than folder exclusions where possible — they're more targeted. Document every exclusion: what was excluded, why, and who approved it. Review exclusions quarterly and remove those no longer needed. Never exclude entire system drives, the Windows directory, or Temp folders — these are primary targets for malware. If an application triggers repeated false positives, report them to the AV vendor for proper handling rather than adding exclusions.