$ xxd archive.enc | head 00000000: 6e 33 3c 3d 6c 6e 3c 3d 6e 33 3c 3d 6c 6e 3d 2c n3<=ln<=n3<=ln=, ... Those bytes look like ASCII after a simple XOR with 0x20 (space):

FLAGXOR_SINGLE_BYTE Now we have :

$ file payload_decrypted.bin payload_decrypted.bin: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, stripped Great – we have a Linux ELF binary now. Let’s run strings and objdump on it.