oclGaussCrack: OpenCL Accelerated Gauss Virus Payload Cracker
The author of oclHashCat (see HERE and HERE for details about oclHashCat) has released a GPU-accelerated tool to crack the hidden payload of the Gauss virus, a cousin of Stuxnet and Flame. In short, OpenCL is mainly used to speed up a loop that computes 10000 times a MD5 hash (more details about the algorithm can be found HERE).
You can download oclGaussCrack from this page. The archive file contains binaries (Windows + Linux) as well as the source code (C language + OpenCL kernel).