A new hack attack is targeting Windows users by sending dangerous emails from printers using Microsoft 365. Here’s what you need to know.
Nobody should be surprised by now at the ingenuity of threat actors looking to hack your accounts and devices. I have recently reported on how SMS attackers can strike without knowing your phone number using theprotections can be bypassed.
What might come as a surprise, however, is the news that a new and ongoing hack attack campaign is enlisting the help of your printer to hack your Windows systems. Here’s what you need to know., already known to have targeted at least 70 organizations, the vast majority of which are based in the U.S., using on-premises devices such as printers to exploit a poorly known Microsoft 365 feature to deploy the Windows hacking attack., allowing devices such as printers and scanners to send email without any authentication. I mean, what could possibly go wrong? Quite a lot, as it happens. “Threat actors are abusing the feature to spoof internal users and deliverThe as yet unnamed hackers used this Microsoft 365 Direct Send function in order to target predominantly U.S. organizations with malicious messages that are “subject to less scrutiny compared to standard inbound email,” according to Barnea. The Varonis investigation has concluded that the ongoing threat campaign appears to have started in May 2025, with a level of “consistent activity over the past two months.” To mitigate the Microsoft 365 Direct Send attacks, Varonis recommends organizations do the following:Use Anti-Spoofing policies. Microsoft, meanwhile, said that most Microsoft 365 and Windows customers don’t need to use the Direct Send feature, and it is working onto protect customers. “We recommend Direct Send only for advanced customers willing to take on the responsibilities of email server admins,” Microsoft concluded.
Microsoft 365 M365 Direct Send Printer Hack Printer Attack Email Hack Windows Hack Varonis Microsoft Security Warning
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