Curious Yellow v0.01 is example code for Fun and Games with FreeBSD Kernel modules. Contains examples for all the different kernel alteration methods plus several small tools that can also be used for detection and defense.
You can download it from the following link: https://packetstormsecurity.com/files/download/25298/cyellow-0.01.tar.gz
Source: https://packetstormsecurity.com/files/25298/cyellow-0.01.tar.gz.html