With no warning, one of the world’s largest criminal botnets—a massive collection of computers used to launch attacks—has disappeared. Researchers have reported huge drops in traffic for two of the most popular pieces of malware which rely on it.
“We can only tell that the Dridex and Locky spam campaigns stopped since June 1 in our observation. We cannot confirm how the botnet was brought down yet,” Joonho Sa, a researcher for cyber-security company FireEye, told Motherboard in an email.
