Antimalware Updates Change Log - Microsoft Security Intelligence [updated] Jun 2026

Want to feel like a spy? Open > Protection history > look for "Security Intelligence Update."

– Format: 1.1.23000.1 This changes less frequently (every 1-3 months) but is critical. Engine updates include new emulation features, unpacker logic, or behavioral sensor improvements. Want to feel like a spy

Penetration testers and red teams monitor the changelog to understand which payloads are now detected. Security teams building EDR (Endpoint Detection and Response) rules cross-reference Microsoft’s signatures to avoid duplication. Protection history &gt

Compare the update timestamp with the first alert. If endpoints updated after the first infection, you have a gap. Want to feel like a spy

Existing signatures are refined. This often happens when malware author changes obfuscation. Example: "Updated detection for Banker:Win32/Emotet — improved heuristic for variant using PowerShell."