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Krebs group ransomwhere12/27/2023 The note provides each recipient with a unique code and instructions to contact the group via a specialist web browser that makes communications untraceable. Rhysida attackers send their ransom notes with the title “CriticalBreachDetected” in a PDF file. A digital asset like bitcoin is popular with ransomware gangs because it is decentralised – it operates outside the conventional banking system and therefore bypasses standard checks – and transactions can be obscured, making them more difficult to track. This helps avoid detection.Īccording to the US agencies document, cryptocurrency is a common form of ransom demand for Rhysida attackers, in line with the rest of the criminal hacking fraternity. According to Secureworks, that dwell time for attacks has fallen to less than 24 hours for cybergangs in general, compared with more than four days in 2022. ![]() Once inside, the gangs typically lurk in the system for a period of time. “These are common access techniques,” said Spilling. The agencies said they had also seen the Rhysida gang running a “ransomware as a service” (Raas) operation, where it hires out the malware to criminals and shares any ransom proceeds.Īccording to the US agencies, gangs using the Rhysida ransomware have used organisations’ virtual private networks – the systems used by staff to access their employers’ systems remotely – to get into systems, or have deployed the familiar technique of phishing attacks, where victims are tricked, usually via email, into clicking on a link that downloads malicious software or tricks them into handing over details such as passwords. US government agencies released an advisory note on Rhysida last week, stating that the “emerging ransomware variant” had been deployed against the education, manufacturing, IT and government sectors since May. In August, it claimed responsibility for an attack on the US hospital group Prospect Medical Holdings. While the British Library is a high-profile UK victim for Rhysida – named after a type of centipede – the group is also responsible for attacks on government institutions in Portugal, Chile and Kuwait. Rafe Pilling, the director of threat research at cybersecurity firm Secureworks, said: “This a classic example of a double extortion ransomware attack and they are using the threat of leaking or selling stolen data as leverage to extort a payment.” ![]() ![]() Rhysida emerged as the assailant this week by posting low-resolution images of personal information gathered in the attack online, offering the stolen data for sale on its leak site with a starting bid of 20 bitcoin, or about £590,000. In recent years, however, in a process dubbed “double extortion”, the majority of gangs steal data at the same time and threaten to release it online, which they hope will strengthen their negotiating hand. Ransomware gangs render an organisation’s computers inaccessible by infecting them with malicious software – malware – and then demanding a payment, typically in cryptocurrency, to unlock the files. While the name behind the attack might be relatively new, the criminal technique is not.
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