In a concerning development for cybersecurity, the Rhysida ransomware group, which has been linked to Kremlin interests, recently targeted Montréal-Nord, a borough in Montreal, Quebec. The group is demanding a ransom of 10 bitcoin, which is currently valued at over $1 million. Rhysida claims to have stolen several critical documents, including an email, an administrative contract, and a Canadian passport. To substantiate their claims, the cybercriminals have already posted samples of these stolen documents on their dark leak blog. Adding pressure to their demands, a countdown clock on the Rhysida auction page ominously indicates that the stolen data will be sold to the highest bidder if the ransom is not paid within four days.
Rhysida’s Modus Operandi and Patterns
Since becoming operational in May 2023, Rhysida has garnered infamy for its double extortion tactics, often targeting vulnerable sectors like education, healthcare, manufacturing, and local governments. Initially, the group typically gains access to targeted systems through phishing attacks. Once a foothold is established, they exploit system vulnerabilities using Cobalt Strike tools before ultimately deploying their ransomware payload. In what is becoming a recurring pattern, Rhysida has also been known to collaborate with the Vice Society ransomware group. In this collaboration, Vice Society utilizes Rhysida’s ransomware and shares in the ill-gotten earnings.
The havoc wreaked by Rhysida is not limited to public sectors; numerous high-profile organizations have fallen victim. For instance, Seattle-Tacoma International Airport endured a weeks-long outage after being attacked. Other notable victims include major airlines such as Delta and Singapore Airlines, the City of Columbus, the Washington Times, the UK’s National British Library, the Anne & Robert H. Lurie Children’s Hospital in Chicago, and the Prospect Medical Group network. These organizations experienced significant operational disruptions, highlighting Rhysida’s capability to affect services on a large scale.
Trending Tactics and Countermeasures
One of the more unsettling revelations about Rhysida’s operations surfaced in February 2024 when Trend Micro detailed their tactics. Remarkably, the group often posed as a cybersecurity team, adding a layer of deception to their nefarious activities. Rhysida’s attacks are marked not only by their disruptive potential but also by the hefty ransoms they demand—highlighted by their $1,350,000 demand from Easterseals. However, there was a significant breakthrough in counteracting Rhysida’s impact when a research team from Korea’s Internet & Security Agency managed to crack Rhysida’s encryption code, ultimately providing a free decryption tool to affected parties.
The overarching trend in Rhysida’s operations revolves around exploiting vulnerabilities through sophisticated phishing techniques and issuing steep ransom demands. This consistent approach underscores the urgent need for enhanced cybersecurity measures among targeted groups. As Rhysida continues to evolve and refine its tactics, organizations must stay vigilant and proactive in safeguarding their systems. Embracing comprehensive cybersecurity protocols will be crucial in mitigating risks posed by such ransomware groups. The battle between cybersecurity defenses and ransomware attackers like Rhysida is ongoing, emphasizing the importance of adaptive security strategies.
This incident highlights the ongoing vulnerability of municipal systems to sophisticated cyberattacks, underscoring the critical need for enhanced cybersecurity measures and response strategies to protect sensitive information and prevent such damaging breaches.