C2 Traffic Impersonating Microsoft Update Service
This rule detects C2 traffic that attempts to impersonate legitimate Microsoft Update services. It specifically looks for HTTP traffic where the host header contains 'windowsupdate.com' or 'update.microsoft.com' (case-insensitive) and the User-Agent header contains 'Windows-Update-Agent'. A threshold of 10 occurrences within 60 seconds from the same source IP triggers the alert, indicating potential command and control activity trying to blend in with normal Windows update traffic.
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