gavz / janus

A Polyglot Binary For BGGP 2021

Janus: A Polyglot Binary for BGGP 2021

You can find the writeup for the project on my blog

janus.com is simultaneously a:

• x86 Bootloader
• DOS COM Executable
• Linux ELF Executable
• RAR Archive
• ZIP Archive
• GNU Multiboot2 Image
• Commodore64 PRG Executable

SHA256 Sum: b2d03260b2e2303e1ea264bce3f82dd57f05c51bfeaebb02a5e485434ee3adef

00000000: 7f45 4c46 0a00 9e20 2832 3439 3129 0000  .ELF... (2491)..
00000010: 0200 3e00 0000 0000 aa00 4000 0000 0000  ..>.......@.....
00000020: 4a00 0000 0000 0000 b40e b700 b300 cd10  J...............
00000030: 9090 90c3 4000 3800 0100 60b4 02b7 00b6  [email protected]...`.....
00000040: 02b2 00cd 1061 c3e8 6601 0100 0000 0500  .....a..f.......
00000050: 0000 0000 0000 0000 0000 0000 4000 0000  ............@...
00000060: 0000 5858 5858 5858 5858 2b00 0000 0000  ..XXXXXXXX+.....
00000070: 0000 2b00 0000 0000 0000 60b4 0630 c0b7  ..+.......`..0..
00000080: 0331 c9ba 4f18 cd10 61c3 0e1f ba11 02b4  .1..O...a.......
00000090: 09cd 21b8 024c cd21 60ac 84c0 7408 e887  ..!..L.!`...t...
000000a0: ffe8 d500 ebf3 61e9 4b01 b001 6689 c7be  ......a.K...f...
000000b0: 1101 4000 b232 0f05 b03c 66ff c70f 0552  [email protected]...<f....R
000000c0: 6172 211a 0700 cf90 7300 000d 0000 0000  ar!.....s.......
000000d0: 0000 004a 9274 2080 3e00 3300 0000 3300  ...J.t .>.3...3.
000000e0: 0000 02b1 9cc4 8aa0 6c28 0c14 301e 0020  ........l(..0.. 
000000f0: 0000 0050 4b03 040a 0000 0000 0058 5858  ...PK........XXX
00000100: 5860 a6d1 2c30 0000 0030 0000 0000 0000  X`..,0...0......
00000110: 0042 4747 5020 3230 3231 2047 4f54 204d  .BGGP 2021 GOT M
00000120: 4520 5448 494e 4b49 4e47 2053 5452 414e  E THINKING STRAN
00000130: 4745 202d 2078 6365 6c6c 6572 6174 6f72  GE - xcellerator
00000140: 0a0d 0024 c43d 7b00 4007 0050 4b01 0200  ...$.={[email protected]...
00000150: 000a 0000 0000 0058 5858 5860 a6d1 2c30  .......XXXX`..,0
00000160: 0000 0030 0000 000f 0000 0000 0058 5858  ...0.........XXX
00000170: 5858 5858 58f3 0000 0060 b486 b000 b901  XXXXX....`......
00000180: 00ba 0000 cd15 61c3 504b 0506 0000 5858  ......a.PK....XX
00000190: 5858 0100 3d00 0000 4b01 0000 5858 5858  XX..=...K...XXXX
000001a0: d650 52e8 0000 0000 0001 0000 2aae ad17  .PR.........*...
000001b0: e8c7 fee8 84fe be11 7de8 cefe a90e 20d2  ........}..... .
000001c0: ffa9 0985 21a9 1085 2020 cc09 60a0 00b1  ....!...  ..`...
000001d0: 20c0 21f0 0bc9 00f0 0d20 eb09 c84c ce09   .!...... ...L..
000001e0: 20e6 094c d409 60a9 0d4c eb09 c940 9002   ..L..`..L...@..
000001f0: 4920 4cd2 ff90 60b4 00cd 1661 ebb2 55aa  I L...`....a..U.