https://learn.microsoft.com/en-us/openspecs/office_file_formats/ms-offcrypto/cab78f5c-9c17-495e-bea9-032c63f02ad8?redirectedfrom=MSDN
[MS-OFFCRYPTO]: ECMA-376 Document Encryption | Microsoft Learn
ECMA-376 document encryption [ECMA-376] using standard encryption does not support CBC and does not have a provision for
document encryptionmsecmamicrosoftlearn