Hi, we recently had an attack on our systems by some hackers that caused some major damage to our network and backup solutions. Because of this I have a large volume of files that have the DMALOCKER code injected into the file header. I am trying to find a way to search the contents of the drive and only show me files without this text, however no matter what I try I keep getting listings for all the files, whether they have this or not. It's having no issue identifying the file if i want it to find this in the header, but not the opposite.