Windows SmartScreen proves to be dumb - zero-day bug fixed after Google alert
Criminals are exploiting a Microsoft SmartScreen bug to deliver Magniber ransomware, potentially infecting hundreds of thousands of devices, without raising any security red flags, according to Google's Threat Analysis Group .
The root cause of both is a flaw in Microsoft's Mark-of-the-Web feature. This is supposed to set a flag in the metadata for files obtained from the internet, USB sticks, and other untrusted sources to ensure that when files are opened, extra security protections are supposed to kick in. While miscreants used JScript files to deliver Magniber ransomware via the earlier bug, the new campaign uses Microsoft Software Installer files with a different type of malformed signature, according to TAG.of the malicious MSI files since January 2023, and said over 80 percent of these were downloaded by European users, which is notable because Magniber usually targets victims in South Korea and Taiwan.
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