Check ps is a simple program that runs ps and compares it with its own list. It currently requires /proc but other scanning methods can be implemented. The program will run in the background or one-shot mode. Check-ps has grown rather to better resist increasingly sophisticated attacks, generate more useful reports, and implement more detection methods.
You can download it from the following link: https://packetstormsecurity.com/files/download/23402/check-ps-1.3.1.tar.gz
Source: https://packetstormsecurity.com/files/23402/check-ps-1.3.1.tar.gz.html