While these attacks bypassed SmartScreen, Google said its Safe Browsing mechanism did warn users in more than 90% of cases. However, in the recent attacks observed by Google, over 80% of the more than 100,000 malicious MSI file downloads have been associated with users in Europe. The Magniber ransomware operation emerged in 2017 and until now it has mainly targeted South Korea and Taiwan. This results in users not being shown an alert associated with the Mark-of-the-Web (MotW) security feature, which is used to prevent the execution of potentially malicious files originating from the internet. These files are signed with an Authenticode signature that is invalid but crafted in a way that causes SmartScreen to return an error. The financially motivated threat actor that is behind the Magniber ransomware has exploited CVE-2023-24880 to deliver specially crafted MSI files. The SmartScreen feature is designed to protect users against phishing and malware, including by flagging potentially malicious files downloaded from the web.
The internet giant’s researchers reported their findings to Microsoft on February 15 and a fix has been released with Microsoft’s latest Patch Tuesday updates. Google’s Threat Analysis Group (TAG) said the vulnerability, tracked as CVE-2023-24880, has been exploited since at least January. A cybercrime group has been exploiting a zero-day vulnerability in the Microsoft SmartScreen security feature to deliver the Magniber ransomware, Google warned on Tuesday.
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