AMSI bypass techniques have a half-life of under 30 days due to Microsoft's continuous hardening

The Antimalware Scan Interface hooks every PowerShell, .NET, and VBScript execution on Windows, and each new AMSI bypass technique published by researchers gets patched by Microsoft within 2-4 weeks. Red teams that develop novel AMSI bypasses must treat them as single-use capabilities because any technique shared in a report or conference talk is immediately added to Defender's detection rules. This forces a constant treadmill where offensive teams burn research hours on bypasses that have a shelf life shorter than most engagement timelines. The problem persists because AMSI is architecturally positioned as an inline hook that Microsoft can update server-side via Defender definitions without requiring a Windows patch.