*1: There were two MOTW bypass vulnerabilities of Windows and they were fixed by the security updates released on 8 November 2022. Tar.exe (bsdtar) of Windows 11 and Windows 10 "Extract all" built-in function of Windows Explorer Comparison table of MOTW propagation support (as of 22 June 2023) Name If archiver software does not propagate MOTW, malicious Office documents in archive files can circumvent blocking.Ī question came up: "What archiver software can propagate MOTW to extracted files?" So I tested some archiver software and summarized the result. To block macro of malicious Office document files that are extracted from archive files, an archiver software has to propagate MOTW to extracted files when an archive file has MOTW. MOTW is stored in Zone.Identifier NTFS alternate data stream. Applications such as web browsers and email clients put MOTW on downloaded files and email attachments that come from the internet. This is a great improvement of defense against malicious Office document files.Īccording to the announcement, whether blocking macro or not is determined based on MOTW (Mark of the Web) attribute of the file. Later, the change will be available in the other update channels, such as Current Channel and Monthly Enterprise Channel. The change will begin rolling out in Version 2203, starting with Current Channel (Preview) in early April 2022. This change only affects Office on devices running Windows and only affects the following applications: Access, Excel, PowerPoint, Visio, and Word. Therefore, to help improve security in Office, we’re changing the default behavior of Office applications to block macros in files from the internet. VBA macros are a common way for malicious actors to gain access to deploy malware and ransomware. On 3 March 2022, Microsoft announced that the default behavior of Office applications on Windows will be changed to block macros in files from the internet (such as email attachment). Comparison of MOTW (Mark of the Web) propagation support of archiver software for Windows
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