The ill-famed IoT botnet that powered one of the biggest denial of service cyberattacks of recent years, has taken control of zombie devices from over 170 countries. The 620 Gbps attack on KrebsOnSecurity seems to have been carried out by 145,000 IoT devices infected with the Mirai DDoS Trojan. The botnet was made up of mostly DVRs and surveillance cameras that use default, easy-to-guess passwords, such as admin and 123456″]
Source: https://www.bitdefender.com/blog/hotforsecurity/mirai-reaches-177-countries-almost-the-whole-planet/