You can use an hexadecimal literal in CQL.
For example:
INSERT INTO simplex.songs (id, img)
VALUES (2cc9ccb7-6221-4ccb-8387-f22b6a1b354d, 0xaa001112);
From CQL3 documentation: A blob constant is an hexadecimal number defined by 0xX+ where hex is an hexadecimal character, e.g. [0-9a-fA-F].