Backdoor, Reverse, Affinity CTF 2019

main_mkfifov.c

undefined8 main(int argc,char **argv)

{
  __uid_t __uid;
  __uid_t _Var1;
  __gid_t __gid;
  int iVar2;
  char *sh_color;
  ulong uVar3;
  
  xor_4f(&DAT_003020c0,8);
  sh_color = getenv(&DAT_003020c0);
  if ((sh_color == (char *)0x0) || (uVar3 = passenvvariable(sh_color), (int)uVar3 != 0)) {
    __uid = geteuid();
    _Var1 = getuid();
    if (__uid != _Var1) {
      while( true ) {
        __gid = getgid();
        iVar2 = setgid(__gid);
        if (iVar2 == 0) break;
        sleep(1);
      }
      while( true ) {
        __uid = getuid();
        iVar2 = setuid(__uid);
        if (iVar2 == 0) break;
        sleep(1);
      }
    }
    xor_4f(s_"$)&)_003020b8,6);
    execvp(s_"$)&)_003020b8,argv);
  }
  else {
    xor_4f(s_`-&!`<'_003020b0,7);
    while (iVar2 = setuid(0), iVar2 != 0) {
      sleep(1);
    }
    execlp(s_`-&!`<'_003020b0,s_`-&!`<'_003020b0,0);
  }
  return 1;
}