![]() ![]() User impact: Admins may be receiving an unexpected amount of high severity alert email messages. Title: Admins may be receiving an unexpected amount of high severity alert email messages A user posted the following status updates on in this thread. They have reverted those additions to the SafeLinks feature that led to the false alerts to fix the problem. So Microsoft found a problem in its SafeLinks feature, which was due to incorrect additions and subsequently alerts from Defender. More detail can be found in the Microsoft 365 admin center under DZ534539. We determined that recent additions to the SafeLinks feature resulted in the false alerts and we subsequently reverted these additions to fix the issue. The status messages in question were filed in the Microsoft 365 Admin Center under the identifier DZ534539. Also, some of the warnings did not display the expected content.Ī couple of hours ago, Microsoft confirmed that false-positive warnings were being triggered by Defender – users could still access the legitimate URLs. Hours ago, Microsoft wrote that it was investigating an issue where legitimate URL links were being incorrectly flagged as malicious by the Microsoft Defender service. There are a number of tweets on Twitter that address the problem. Now Microsoft has confirmed that there was a problem with Defender. It was soon clear, that it might be a false positive, because Windows 11 complains malicious files, while Defender remains silent on Windows 10. Only files of the type ".RAR" are affected.įeedback from other users to my blog post revealed that some users were affected in different scenarios. When I download the same file on the Win 10 computer, there is no alert. Only on the Win 11 computers, Defender reports since a few days that it has found the Trojan "Wacatac.H!ml". I work parallel with Win 10 and Win 11 computers. ![]() In his case, the Defender under Windows 11 alarms with RAR archive files and reports a Trojan "Wacatac.H!ml" as a detection. has sent me an email on Sunday about the issue that has been bugging him for several days. I had pointed out this phenomenon in my German blog in the post Windows 11: Defender meldet RAR-Archive als Trojaner "Wacatac.H!ml". Windows' built-in Defender has once again attracted attention because it was classifying various files or URLs as malicious and denying access. Windows users are not getting any peace of mind regarding Microsoft Defender.
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