packer

1. Trying file and strings:

   ```shell file unpackme-upx

   unpackme-upx: ELF 64-bit LSB executable, x86-64, version 1 (GNU/Linux), statically linked, no section header ```

   Can't use GDB as file is stripped

   ```shell strings unpackme-upx

   . . UPX! UPX! ```

   Hmm... It is packed with UPX

2. Unpack:

   ```shell upx -d unpackme-upx file unpackme-upx

   unpackme-upx: ELF 64-bit LSB executable, x86-64, version 1 (GNU/Linux), statically linked, BuildID[sha1]=5e4be04529afcdb8fa8855e3138c3f51047fa123, for GNU/Linux 3.2.0, not stripped ```

   "not stripped" yay! GDB time now

3. break at main, run, and disas:

   gdb . . 0x0000000000401ec0 <+125>: call 0x410d30 <__isoc99_scanf> 0x0000000000401ec5 <+130>: mov -0x3c(%rbp),%eax 0x0000000000401ec8 <+133>: cmp $0xb83cb,%eax 0x0000000000401ecd <+138>: jne 0x401f12 <main+207> . .

   Seems the desired number is 0xb83cb = 754635