Researchers from Arctic Wolf and Guidepoint Security report that members of the BianLian ransomware group are sending physical letters to corporate executives. These letters inform recipients that their IT networks have been compromised and threaten to leak sensitive data unless a ransom is paid within 10 days. This tactic is unusual as ransomware groups usually follow up on attacks with digital communication, but the letters are crafted to resemble traditional ransom notes, highlighting an evolution in extortion methods.
Sending physical letters through the mail system is an unusual move for a cybercriminal group, which typically sends ransom notes in digital form following a cyberattack.
The letters mimic those conventional ransom notes, demanding a payment within 10 days in exchange for not leaking the data.
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