8/30/2023 0 Comments 7z file extractor onlineOn Monday, he took to Mastodon to report that the Microsoft collaboration tool had recently flagged a zip file, which had been protected with the password “infected.” The security researcher has long archived malware inside password-protected zip files before exchanging them with other researchers through SharePoint. While analysis of password-protected files in Microsoft cloud environments is well-known to some people, it came as a surprise to Andrew Brandt. Microsoft is one-upping this move by attempting to bypass password protection in zip files and, when successful, scanning them for malicious code. Eventually, some threat actors adapted by protecting their malicious zip files with a password the end user must type when converting the file back to its original form. ![]() Microsoft cloud services are scanning for malware by peeking inside users’ zip files, even when they’re protected by a password, several users reported on Mastodon on Monday.Ĭompressing file contents into archived zip files has long been a tactic threat actors use to conceal malware spreading through email or downloads.
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