The real problem isn’t acccr, it’s the service that has been installed that is regenerating the file.
Install WinPatrol. (Freeware from the web.) Its display of the running services is easier to navigate than the Windows version. Then delete the odd-ball service.
Also, Search your hard drive for all .exe files. Sort them by most recent date first. Then work backwards, looking for unknown executables that have been added lately. Most of these kinds of programs install their reinstaller in the System32 folder.