February 8, 2023

Magniber ransomware has been targeting home users by masquerading as software updates recent research has discovered.

A ransomware campaign last month saw Magniber ransomware campaigns distributing the ransomware in JavaScript files.

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Researchers said, the attackers used clever techniques to evade detection, such as running the ransomware in memory, bypassing User Account Control in Windows, and bypassing detection techniques that monitor user-mode hooks by using syscalls instead of standard Windows API libraries.

With the UAC bypass, the malware deletes the infected system’s shadow copy files and disables backup and recovery features, preventing the victim from recovering their data using Windows tools.

The ransomware campaign, the infection chain starts with a web download from an attacker-controlled website. The user is asked to download a ZIP file containing a JavaScript file that purports to be an important anti-virus or Windows 10 software update.

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For Magniber to access and block files, it needs to be executed on a Windows account with administrator privileges a level of access which is much more commonplace in personal systems. The positive note is that this ransomware does not fall into the category of Big Game Hunting but can still cause significant damage.

This research was documented by researchers from HP Wolf Security

Indicators of Compromise

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