Every time a user downloads a file from an untrusted source, Windows automatically adds a Mark of the Web (MOTW) token to the file. When this file is opened or executed, Windows reminds users that the file comes from an untrusted source and shouldn’t be opened unless the user themselves trust the source.
This particular exploit has been used in the past with ISO files being used to distribute QBot, where Windows would not correctly append the MOTW flag to ISO files allowing them to bypass the warning. However, as part of the November 2022 Patch Tuesday, Microsoft fixed the bug to propagate the flag to any ISO files downloaded from untrusted sources.
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