A new botnet is slowly building critical mass on the back of unsecured webcams and IP cameras, currently mass-scanning the Internet for vulnerable devices. The mass scans started on April 16, about a month after security researcher Pierre Kim disclosed a vulnerability affecting over 1,250 camera models. NetLab linked the port 81 scans to a new IoT botnet, which has 43,621 bots. On April 23, this botnet showed its teeth for the first time when it used it to launch a DDoS attack against a Russian bank.
Source: https://www.bleepingcomputer.com/news/security/new-iot-botnet-rises-feeding-on-vulnerable-security-cameras/