Taller Reversing .exe

https://www.youtube.com/channel/UCPNPSP20z4FGfgMJ71VOJjw/videos


; int __fastcall main(int argc, const char **argv, const char **envp)
main proc near

result= byte ptr -58h
access_key= byte ptr -50h
var_18= qword ptr -18h

; __unwind { // __GSHandlerCheck
push    rdi
sub     rsp, 70h
mov     rax, cs:__security_cookie
xor     rax, rsp
mov     [rsp+78h+var_18], rax
lea     rax, [rsp+78h+access_key]
mov     rdi, rax
xor     eax, eax
mov     ecx, 32h ; '2'
rep stosb
lea     rcx, _Format    ; "Ingrese la clave de acceso: "
call    printf
mov     edx, 28h ; '('  ; Size
lea     rcx, [rsp+78h+access_key] ; Buffer
call    cs:__imp_gets_s
lea     rcx, [rsp+78h+access_key] ; serial
call    ?myfuncion@@YA_NPEAD@Z ; myfuncion(char *)
mov     [rsp+78h+result], al
movzx   eax, [rsp+78h+result]
test    eax, eax
jz      short loc_140001107

Tecla X para ver sus usos

jz → (if)

canary → security code (C++)

call cs:__imp_gets_s → lee teclado por entrada

EJ3