go-derper.rb is a tool for hacking memcached servers, released as part of our BlackHat USA. It uses elements of the memcached protocol to derive full lists of keys stored on the memcached server, and can therefore extract the contents of the cache. In addition, it also supports basic searching of retrieved data via user-configurable regular expressions, fingerprinting of multiple caches, monitoring usage in caches as well as basic cache content manipulations such as value insertion, overwrites and deletion.
You can download it from the following link: https://packetstormsecurity.com/files/download/95326/go-derper.tgz
Source: https://packetstormsecurity.com/files/95326/Sensepost-Go-Derper-Memcached-Utility.html