The U.S., Russia, and Canada accounted for most of the vulnerable Exim servers, which are on versions 4.97.1 or earlier, according to a report from Censys.
Organizations affected by the breach have been urged by security researcher and former Microsoft employee Kevin Beaumont to be vigilant of the emails, which were not sent in adherence to the Microsoft 365 breach process.
Hackread reports that malware attacks were allegedly conducted by major South Korean internet service provider KT, formerly known as Korean Telecom, to more than 600,000 computers belonging to customers leveraging the widely used file-sharing service Webhard.
Officials at the City of Philadelphia have confirmed that 35,881 individuals had their personal and protected health information exfiltrated following the compromise of several email accounts from late May to late July 2023.
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