Ukrainian Hacker Group Takes Down Moscow ISP As a Revenge For Kyivstar Cyber Attack

Longtime Slashdot reader Plugh shares a report from Daily Security Review: A Ukrainian hacker group carried out a destructive attack on the servers of a Moscow-based internet provider to take revenge for Kyivstar cyberattack. The group, known as Blackjack, successfully hacked into the systems of M9com, causing extensive damage by deleting terabytes of data. Numerous residents in Moscow experienced disruptions in their internet and television services. Additionally, the Blackjack hacker group has issued a warning of a potentially larger attack in the near future.

Based on the information provided by Ukrinform, the cyber attack on M9com deleted approximately 20 terabytes of data. The attack targeted various critical services of the company, including its official website, mail server, and cyber protection services. Furthermore, the hackers managed to access and download over 10 gigabytes of data from M9com's mail server and client databases. To make matters worse, they made this stolen information publicly accessible via the Tor browser.

Based on the nature of the attack on M9com, it appears that when the hackers hit Moscow, they were able to gain access to the back-end operations of the company. This allowed them to effectively delete data from the servers, similar to what occurred in the Kyivstar incident. It is worth noting that this type of attack, which involves directly targeting and compromising the servers, is less common compared to the more frequently observed distributed denial-of-service (DDoS) attacks. DDoS attacks overwhelm a system by inundating it with automated requests, causing the service to become inaccessible.

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