Internet Census 2012 – Port scanning /0 using insecure embedded devices. This write up discusses the Carna Botnet that was created and leveraged to scan all IPv4 addresses. It made use of 420 thousand insecure devices to complete the effort.
You can download it from the following link: https://packetstormsecurity.com/files/download/120843/portscanningslashzero.txt
Source: https://packetstormsecurity.com/files/120843/Port-Scanning-0-Using-Insecure-Embedded-Devices.html