The idea is that if an untrusted document contained malware, it would be isolated from your PC. For example, Microsoft announced Application Guard in 2019, as a way to sandbox untrusted spreadsheets and other documents. Microsoft has previously put in protections in place to help manage macros, and it’s unclear whether those protections will still be in place. That support document also details how enterprises can manage macros by policy. In that case, the macro is considered to be trusted. The macro will also run if the user had previously opened the file, before this change in default behavior, and had selected Enable content from the Trust Bar, according to a Microsoft support document. The macro will still be loaded if the file comes from a trusted location, or if the macro is digitally signed, with the security certificate supplied to the user. Technically, the block will apply to macros downloaded from the Web, with what Microsoft calls with the Mark of the Web applied. Previous versions of Office include a warning when opening documents that contain macros, but malware authors have become more resilient in their social engineering tactics, luring users to enable macros in good faith and ending up infected,” the company wrote in 2016. “The enduring appeal for macro-based malware appears to rely on a victim’s likelihood to enable macros. Microsoft has recognized the security issues associated with macros for some time.
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