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Magniber Ransomware Gang Now Exploits Internet Explorer Flaws in Attacks

Magniber Ransomware Gang Now Exploits Internet Explorer Flaws in Attacks

The Magniber ransomware gang is now using two Internet Explorer vulnerabilities and malicious advertisements to infect users and encrypt their devices.

The two Internet Explorer vulnerabilities are tracked as CVE-2021-26411 and CVE-2021-40444, with both having a CVSS v3 severity score of 8.8.

Also Read: Document Shredding Services for Commercial Document Destruction

The first one, CVE-2021-26411, was fixed in March 2021 and is a memory corruption flaw triggered by viewing a specially crafted website.

The second flaw, CVE-2021-40444, is a remote code execution in IE’s rendering engine triggered by the opening of a malicious document.

Attackers exploited CVE-2021-40444 as a zero-day before Microsoft fixed it in September 2021.

Magniber shifting focus

The Magniber gang is known for its use of vulnerabilities to breach systems and deploy their ransomware.

In August, Magniber was observed exploiting ‘PrintNightmare’ vulnerabilities to breach Windows servers, which took Microsoft a while to address due to their impact on printing.

Also Read: 4 Steps to Data Protection Certification For Your Business

The most recent Magniber activity focuses on exploiting Internet Explorer vulnerabilities using malvertising that pushes exploit kits, as confirmed by Tencent Security researchers who identified “fresh” payloads.

One possible explanation for this shift is that Microsoft has largely fixed the ‘PrintNightmare’ vulnerabilities over the past four months and was heavily covered by the media, pushing admins to deploy security updates.

Another reason why Magniber may have turned to Internet Explorer flaws is that they are relatively easy to trigger, relying solely upon stimulating the recipient’s curiosity to open a file or webpage.

It may seem strange to target an old unpopular browser like Internet Explorer. However, StatCounter shows that 1.15% of the global page views are still from IE.

While this is a low percentage, StatCounter tracks over 10 billion page views per month, which equates to 115,000,000 pages views by users of Internet Explorer.

Furthermore, it is much harder to target Firefox and Chromium-based browsers, such as Google Chrome and Microsoft Edge, as they utilize an auto-update mechanism that quickly protects users from known vulnerabilities.

Threat to Asian firms

Magniber started in 2017 as the successor to the Cerber ransomware, and initially, it only infected users from South Korea.

The group then widened their targeting scope and began infecting Chinese (including Taiwan and Hong Kong), Singaporean, and Malaysian systems as well.

Magniber ransom note
Magniber ransom note

This scope has solidified, and today, Magniber is a nuisance almost exclusively for Asian companies and organizations.

Since its launch, the Magniber ransomware has been under very active development, and its payload has been completely rewritten three times.

At this time, it remains uncracked, so there’s no decryptor to help you restore any files that have been encrypted with this strain.

Finally, Magniber isn’t following the trend of file-stealing and double-extortion, so the damage of their attacks is limited to file encryption.

As such, taking regular backups on secured, isolated systems is a very effective way to deal with this particular threat.



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