Expired Domains Allowed Control Over 4,000 Backdoors on Compromised Systems

No less than 4,000 unique web backdoors previously deployed by various threat actors have been hijacked by taking control of abandoned and expired infrastructure for as little as $20 per domain. Cybersecurity company watchTowr Labs said it pulled off the operation by registering over 40 domain names that the backdoors had been designed to use for command-and-control (C2). In partnership with the