Malick was a crew-member on board the Von Braun. He was influenced by the The Many to serve them and give them control over XERXES since he had a history of hacking it before.
Malick becomes aware that Melanie Bronson is on to him. He entrusts 3 cyborgs to assist him in the process of taking over all 3 Simulation Units and set up a surprise for Bronson and her troops.
Malick is found dead in the Crew Quarters on the Operations Deck, the last audio email shows that he was killed by Melanie Bronson.