Includes a 10-byte header containing a "magic number" ( 1f 8b ), a compression method, and timestamps.
It could be a custom wrapper for the standard gzip utility, used to bypass automated security scanners that look for common filenames. fckrgzip
If you encountered this file in a server directory or a repository, it is often a sign of a "web shell" or a custom compression script used to exfiltrate data. 2. Experimental or Personal Repositories Includes a 10-byte header containing a "magic number"
To understand what a tool like "fckrgzip" might be modifying, it helps to look at the standard structure it is likely based on: a compression method