intent
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snippet
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push the word 0x5974 onto the stack
push word 0x5974
subtract the contents of al register from the contents of bl register and save the result in bl
sub bl, al
push 0x81e3a8c0 onto the stack
push 0x81e3a8c0
compare the contents of edx to 42
cmp edx, 42
pop the value on the stack back into edx
pop edx
define an array of bytes and initialize it to 0x3e,0xcd,0x5d,0x75,0x3c,0x3c,0x80,0x75,0x75,0x3c,0x6f,0x76,0x7b
db 0x3e,0xcd,0x5d,0x75,0x3c,0x3c,0x80,0x75,0x75,0x3c,0x6f,0x76,0x7b
subtract 0x2c3d2dff from the contents in eax and save the result in eax
sub eax, 0x2c3d2dff
jump to the address specified by the operation fupdisasm+3
jmp fupdisasm+3
move 61 into al
mov al, 61
perform a logical xor between the ebx register and the word __flag_byte and save the result in ebx
xor ebx, word __flag_byte
divide ebx by 4 using right shift
shr ebx, 2
define the _dup2_loop label
_dup2_loop:
define the byte addr and initialize it to 0x1
addr: db 0x1
if the contents of the eax register is not zero then jump to the label l1 else call the function myfunct
test eax, eax \n jnz l1 \n call myfunct
jump to the edi label
jmp edi
move 0x1 into dl
mov dl, 0x1
push the contents of the edi register onto the stack and point edx to the stack register
push edi \n mov edx, esp
jump to the memory address 0x47 if the contents of the eax register is equal to the contents of the edi register
cmp eax, ebx \n je 0x47
define chmod_call equal to 15
chmod_call equ 15
write to the stdout file
mov ebx, 1
push the 0x64777373 onto the stack
push 0x64777373
move al into edi
mov [edi], al
add an immediate operand 65 to byte_value
add byte_value, 65
declare the exit label
exit:
move n to edx
mov edx, n
push double word 0x39396e2d onto the stack and point the ebp register to the stack register
push dword 0x39396e2d \n mov ebp, esp
jump to the data label
jmp data
jump to the _start label if the value in the eax register is not equal to the doubleword addressed by edi else jump to the edi register
scasd \n jnz _start \n jmp edi
jump to the label l1 if the contents of the al register is greater than or equal to the decimal value 9
cmp al, 9 \n jge l1
push the 0x69622f2f onto the stack
push 0x69622f2f
move 0x6374652f into the dword at address [esp-12]
mov dword [esp-12], 0x6374652f
push esp to the stack
push esp
subtract 1564 from the contents of the ax register
sub ax, 1564
declare .text section
section .text
move ecx into the address [ebp+12]
mov [ebp+12], ecx
jump to the memory address 0x8 if the contents of the eax register is not equal to the contents of the eax register else zero out the eax register
cmp eax, eax \n jne 0x8 \n xor eax, eax
declare _shell as global label
global _shell
move cl into bl
mov bl, cl
multiply eax by 2 using left shift
shl eax, 1
declare the stage label
stage:
subtract the address in ebx from the address in eax
sub eax, ebx
move 0x68732f2f into the dword at address [esp-8]
mov dword [esp-8], 0x68732f2f
push 0x706d742f onto the stack
push 0x706d742f
push the byte 0x64 onto the stack
push byte 0x64
jump to the formatting label if the zero flag is set
jz formatting
move 0x4 into bl
mov bl, 0x4
push 0x2e383631 to the stack
push 0x2e383631
declare an array of six words each initialized with the numbers 34 45 56 67 75 89
numbers dw 34, 45, 56, 67, 75, 89
set eax to 0
xor eax, eax
subtract 20h from the 8-bit at memory location ebp+ecx
sub byte [ebp+ecx],20h
return
ret
move ebx into the address [esp+59]
mov [esp+59], ebx
jump to incaddr if no match
jnz incaddr
push the word cx onto the stack
push word cx
move the first element of array into ecx
mov ecx, array
declare the createfile label
createfile:
add 0x2 to the contents in bl and save the result in bl
add bl, 0x2
push 0x1c onto the stack
push 0x1c
define the _random label
_random:
install portable signal handler
mov eax, 67
call the start function
call start
move the contents of the eax into the double word starting at the address [esp-0x4]
mov dword [esp-0x4], eax
move the value 0x4 into the al register
mov al, 0x4
if the unsigned contents of the al register is greater than the unsigned contents of the bl register then jump to the l2 label else add the value 3 to the eax register
cmp al, bl \n ja l2 \n add eax, 3
move 0x243525f0 into esi
mov esi, 0x243525f0
put the offset of hello in ecx
mov ecx, hello
move the contents of memory address ebx+esi into ebx
mov ebx, [ebx+esi]
push the contents of eax onto the stack
push eax
push the dword 0x68732f63 onto the stack
push dword 0x68732f63
push the word 0x662d onto the stack and point the edx register to the stack register
push word 0x662d \n mov edx, esp
move 0x978cd092 into edi
mov edi, 0x978cd092
define find_egg function
find_egg:
define two label
two:
move 1 into eax
mov eax, 1
declare three doublewords of memory starting at address z and initialized to 1 2 and 3
z dd 1,2,3
add the byte in edi to the al register
add al, byte [edi]
move al into cl
mov cl, al
jump to decode_pr if not signed
jns decode_pr
move al into the byte at address [esi+21]
mov byte [esi+21], al
direction flag equal to zero
cld
define fupdisasm function
fupdisasm:
push the contents of the eax register onto the stack and point ecx to the stack register
push eax \n mov ecx, esp
sigaction
push byte 0x43
left shift the contents of the edi register by 0x1 bit
shl edi, 0x1
jump short to decode if not zero
jnz short decode
push the 0x6475732f onto the stack
push 0x6475732f
move 02001 into cx
mov cx, 02001
push the word [edx] onto the stack
push word [edx]
move dl into the single byte at the address stored in ecx+92
mov byte [ecx+92], dl
decrement ecx and jumps to the fill label unless decrementing ecx caused its value to become zero
loop fill
reserve 1 byte for number variable
number: resb 1
move the byte at the address 2h into al
mov al, byte 2h
if the contents of the bl register is greater than the value 78h then jump to the memory location loc_402B1D
cmp bl, 78h \n jg short loc_402B1D
move eatlen into edx
mov edx, eatlen
clear edx
xor edx, edx
add ecx to ebx
add ebx, ecx
put the syscall 0x8 into the al register
mov al, 0x8
move edi into ecx
mov ecx, edi
left shift the contents of al by 4 bit positions
shl al, 4
move decimal 78 into edx
mov edx, 78