Tether: Tether faced an extortion demand from cyberattackers who threatened to leak documents online that would "harm the Bitcoin ecosystem." The demand, of approximately $24 million or 500 Bitcoin (BTC), was met with deaf ears as the blockchain organization refused to pay.In addition, Mimecast-issued certificates and some customer server connection datasets were also caught in the breach. Mimecast said that its production grid environment had been compromised, leading to the exposure and theft of source code repositories. Mimecast: Due to the Solarwinds supply chain attack disclosed in December 2020, Mimecast found itself as a recipient of a malicious software update that compromised the firm's systems.The cybercriminal group which claimed responsibility, Cuba, claimed to have stolen a wide range of financial information on their leak site. ATFS: A ransomware attack against payment processor ATFS forced multiple US cities to send out data breach notifications.Airlines involved in the data breach were then required to reach out to their customers. SITA: An IT supplier for aviation services around the world, SITA, said a security incident involving SITA Passenger Service System servers led to the exposure of personal, identifiable information belonging to airline passengers.The information leaked included everything from full names to Facebook account tokens. MeetMindful: The data of over two million users of the dating app was reportedly stolen and leaked by a hacking group.Tens of thousands of organizations are believed to have been compromised. The Redmond giant became aware of the flaws in January and released emergency patches in March however, the Hafnium state-sponsored threat group was joined by others for months after in attacks against unpatched systems. Microsoft Exchange Server: One of the most damaging cybersecurity incidents this year was the widespread compromise of Microsoft Exchange servers caused by a set of zero-day vulnerabilities known collectively as ProxyLogon.The Russian trading post claimed that threat actors were able to break in and tamper with cryptocurrency exchange rate values, leading to irreparable financial damage. Livecoin: Following an alleged hack in December, cryptocurrency exchange Livecoin slammed its doors shut and exited the market in January.
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