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ben_greenwood
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jinn
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netspooky
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qkumba
qkumba
 
 
remy
remy
 
 
retr0id
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s01den
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vechs
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xcellerator
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README.md
README.md
 
 

README.md

BGGP 2021

This was the second annual Binary Golf Grand Prix, which took place June 18th - September 17th 2021.

Challenge Announcement and Rules: https://binary.golf/2/

This page will be updated as writeups and other resources come in!

Each file mentioned is included in this repo. Score files are in PNG and ANS format. Every entry was marked up to detail the various file overlays and other tricks done.

Category 1

Category 1 files aim to be the smallest polyglot of a given combination of files that returns or prints the value "2".

Entries here are ordered by size, largest to smallest.

743 Bytes - vechs/vechs_bggp

AUTHOR: vechs                                                        
DATE:   20210916                                                        
SIZE:   743                                                             
FILES:  ELF, RAR                                                        
SHA256: c42683c21382b552b34d0e171548cc2136acad35e382b95bdc3900711f549973

Links:

489 Bytes - fliermate/bggp2021

AUTHOR: fliermate                                                        
DATE:   20210805                                                          
SIZE:   489                                                               
FILES:  ELF, PDF                                                          
SHA256: 821b8d0f5f5b69b3d5000fadf498cc798b4b9416ceab3432e55c2e75ba854ad8

fliermate was last years BGGP winner!

Links:

  • Github
  • File: fliermate/bggp2021
  • Source: fliermate/BGGP2021

39 Bytes - s01den/sc_polyglot.nes

AUTHOR: s01den
DATE:   20210721                                                         
SIZE:   39                                                               
FILES:  NES ROM, x86 Shellcode                                           
SHA256: 86243302cdab17f4d2be7f845a1cac6795ee657d48a70a05e5af4dd9571e74b0

We thought this file was cool even though it doesn't return 2! It won't be officially scored and is here to showcase an interesting technique!

Links:

  • s01den twitter
  • File: s01den/sc_polyglot.nes
  • Source: s01den/sc_polyglot.asm

15 Bytes - qkumba/test2

AUTHOR: qkumba
DATE: 20210619
SIZE: 15
FILES: COM, Bash/Shell, Batch, Javascript, VBScript
SHA256: 4bfe10fb3cb8f70c221b010d33f56923b2329dd5027b431c2a69437fc9db76bc

Links:

7 Bytes - qkumba/test3

AUTHOR: qkumba
DATE: 20210619
SIZE: 7
FILES: COM, Javascript
SHA256: ab0c35065d65008c38d572da3d77f04be4e79c31bc24c7b7087607af062244d4

Links:

3 Bytes - retr0id/bf.txt 👑

AUTHOR: retr0id
DATE: 20210916
SIZE: 3
FILES: brainfuck, TXT
SHA256: 963cf87ddd41be481dacec23bcb26b756803b5b57915c43f3da040f7cd9e3ef6

Links:

Category 2

Category 2 files aim to pack the most files into the base executable, with points earned for bytes overlaying the base file, and two more points for each byte from a different file executed as code.

Entries here are ordered by score, lowest to highest.

remy/bggp.wasm

AUTHOR: remy                                                        
DATE:   20210623                                                          
SIZE:   584                                                               
FILES:  WASM, GBA ROM, 7Zip                                               
SHA256: 59c9a995f11e76ce5b996e62d5baeb4410a5f9492f9c6b205b7a9a5a8750434e  
SCORE:  1.1369

Score Breakdown

START END SIZE FILE OL EXEC OL TOTAL Description
0x0000 0x0248 584 - - - WASM
0x00A1 0x00A4 3 - - - Code Section 1
0x0000 0x0248 584 584 3x2=6 590 GBA ROM
0x01FE 0x0248 74 74 - 74 7Zip Archive

Total Points / Host Size = Final Score 664 / 584 = 1.1369

RUN

   WASM  $ npx -p wabt wasm-interp out/main.wasm --host-print           
GBA ROM  $ cp wasm.bggp wasm.gba ; run in Visual Boy Advance - M v2.1.4 
   7Zip  $ 7z x bggp.wasm

Links

jinn/jinn.com

AUTHOR: jinn
DATE:   20210621                                                        
SIZE:   32                                                              
FILES:  COM, BMP                                                        
SHA256: fed8245df8b4b60be3a96e03c8e8fb83041006925ff2709e3533ebf73d34917f
SCORE:  1.8000

Score Breakdown

START END SIZE FILE OL EXEC OL TOTAL Description
0x0000 0x001E 30 - - - EXE
0x0000 0x0008 8 - - - Code Section 1
0x001A 0x001E 4 - - - Code Section 1
0x0000 0x0020 32 30 12x2=24 54 BMP

Total Points / Host Size = Final Score

54 / 30 = 1.8000

RUN

COM  $ dosbox jinn.com  
BMP  $ feh jinn.com

Links

retr0id/two.chip8.pbm

AUTHOR: retr0id
DATE:   20210916                                                        
SIZE:   23                                                              
FILES:  CHIP-8, PBM                                                     
SHA256: 1407370ca78118ae67dfd8d1127c7cfaad35c339d32ba648b69e24b8be25a141
SCORE:  1.8695

Score Breakdown

START END SIZE FILE OL EXEC OL TOTAL Description
0x0000 0x0017 23 CHIP-8 ROM
0x0000 0x000A 10 Code Section 1
0x0000 0x0017 23 23 10x2=20 43 PBM

Total Points / Host Size = Final Score

43 / 23 = 1.8695

RUN

CHIP-8  Open two.chip8.pbm in https://ajor.co.uk/chip8/chip8.html 
   PBM  $ feh two.chip8.pbm

Links

netspooky/alert2.exe

AUTHOR: netspooky                                                    
DATE:   20210916                                                        
SIZE:   487                                                             
FILES:  EXE, Javascript, PDF                                            
SHA256: 55f8e1e8ebaf5f49016d74a154b18c475039d148076ad2aceec9622d1139da2b

Score Breakdown

START END SIZE FILE OL EXEC OL TOTAL Description
0x0000 0x01E1 481 - - - EXE
0x0157 0x01E1 138 - - - Code Section 1
0x0000 0x01E7 487 481 138x2=276 757 Javascript
0x000C 0x0157 331 331 - 331 PDF

Total Points / Host Size = Final Score

1088 / 481 = 2.2619

RUN

       EXE  C:\> alert2.exe                                                     
Javascript  echo '<script src="./alert2.exe"></script>' > 2.html; firefox 2.html
       PDF  C:\> firefox alert2.pdf

Links

retr0id/jar.png

AUTHOR: retr0id
DATE:   20210916                                                        
SIZE:   3584                                                            
FILES:  CHIP-8, PNG, brainfuck, JAR, PDF                                
SHA256: 1407370ca78118ae67dfd8d1127c7cfaad35c339d32ba648b69e24b8be25a141
SCORE:  2.8347

Score Breakdown

START END SIZE FILE OL EXEC OL TOTAL Description
0x0000 0x083A 2106 - - - CHIP-8 ROM
0x0000 0x0008 8 - - - Code Section 1
0x080A 0x083A 48 - - - Code Section 2
0x0000 0x0E00 3584 2106 56x2=112 2218 PNG
0x0031 0x0DEA 3511 2057 48x2=96 2153 Brainfuck
0x025B 0x0E00 2981 1503 48x2=96 1599 JAR
0x0991 0x0A93 258 - - - PDF

Total Points / Host Size = Final Score

5970 / 2106 = 2.8347

RUN

   CHIP-8  Open jar.png in https://ajor.co.uk/chip8/chip8.html
      PNG  $ feh jar.png                                      
brainfuck  $ bf jar.png                                       
      JAR  $ java -jar jar.png                                
      PDF  $ cp jar.png jar.pdf ; firefox jar.pdf

Links

ben_greenwood/fileglot

AUTHOR: Ben Greenwood
DATE:   20210622                                                        
SIZE:   28                                                              
FILES:  COM, TXT                                                        
SHA256: 50920154f28289f3acc43f180432c20124f05eab20c45e7f00c30a30be167304
SCORE:  3.0000

Score Breakdown

START END SIZE FILE OL EXEC OL TOTAL Description
0x0000 0x001C 28 - - - COM
0x0000 0x001C 28 - - - Code Section 1
0x0000 0x001C 28 28 28x2=56 84 TXT

Total Points / Host Size = Final Score

84 / 28 = 3.0000

RUN

COM  $ cp fileglot fileglot.com ; dosbox fileglot.com
TXT  $ cat fileglot

Links

  • File: ben_greenwood/fileglot
  • Writeup: ben_greenwood/writeup.fileglot.txt
  • Source: ben_greenwood/fileglot.asm

ben_greenwood/poly

AUTHOR: Ben Greenwood
DATE:   20210730                                                        
SIZE:   2560                                                            
FILES:  EXE PE32, DOS EXE, HTML, TGA  RAR  PDF  MP3                     
SHA256: 73753a4dcf4a8393880d80fd39ca8fe30b7555e37838614a7f39baac185d569e
SCORE:  3.3285

We weren't able to open the Zip or 7z files on Ubuntu or Windows per the writeup or other tools. We tried WinRar, 7Zip, p7zip, unzip, and each one marked the file as corrupted, or opened the EXE as a zip. :(

Score Breakdown

START END SIZE FILE OL EXEC OL TOTAL Description
0x0000 0x09FF 2560 - 21 - EXE PE32
0x07E8 0x07FD 21 - - - Code Section 1
0x0000 0x0080 128 128 - 128 EXE DOS
0x0000 0x09FF 2560 2560 21x2=42 2602 HTML
0x0000 0x09D9 2521 2521 21x2=42 2563 TGA
0x0212 0x0942 1840 1840 21x2=42 1882 RAR
0x02A9 0x03CB 290 290 - 290 PDF
0x03CB 0x07E8 1056 1056 - 1056 MP3
0x01DA 0x09FF Zip - Couldn't Verify
0x01F0 0x0994 7z - Couldn't Verify

Total Points / Host Size = Final Score

8521/2560 = 3.3285

RUN

EXE PE32  C:> poly.exe
 DOS EXE  $ cp poly poly.exe ; dosbox poly.exe
    HTML  $ cp poly poly.html ; firefox poly.html
     TGA  Open in Paint dot Net
     RAR  $ unrar poly
     PDF  $ cp poly poly.pdf ; firefox poly.pdf
     MP3  $ cp poly poly.mp3 ; vlc poly.mp3

Links

  • File: ben_greenwood/poly
  • Writeup: ben_greenwood/writeup.poly.txt

xcellerator/janus

AUTHOR: xcellerator
DATE:   20210917
SIZE:   512                                                                      
FILES:  x86 Bootloader, COM, ELF, RAR, ZIP, GNU Multiboot2 Image, Commodore64 PRG
SHA256: b2d03260b2e2303e1ea264bce3f82dd57f05c51bfeaebb02a5e485434ee3adef         
SCORE:  4.1328

Score Breakdown

START END SIZE FILE OL EXEC OL TOTAL Description
0x0000 0x0200 512 - - - x86 Bootloader
0x0000 0x0002 2 - - - Code Section 1
0x003A 0x004A 16 - - - Code Section 2
0x007A 0x00AA 48 - - - Code Section 3
0x01B0 0x01BC 12 - - - Code Section 4
0x01F5 0x01FE 9 - - - Code Section 5
0x0000 0x0200 512 512 87x2=174 686 COM
0x0000 0x01F5 501 501 76x2=152 653 C64 PRG
0x0000 0x0143 323 323 66x2=132 455 ELF
0x00BF 0x0144 133 133 - 133 RAR
0x00F3 0x019C 169 169 - 169 ZIP
0x019C 0x01B0 20 20 - 20 GNU Multiboot

Total Points / Host Size = Final Score

2116 / 512 = 4.1328

RUN

x86 Bootloader  $ qemu-system-x86_64 janus.com                 
           COM  $ dosbox janus.com                             
           ELF  $ ./janus.com                                  
           RAR  $ unrar janus.com                              
           ZIP  $ 7z x janus.com                               
GNU Multiboot2  $ grub-file --is-x86-multiboot2 janus.com      
       C64 PRG  $ x64 janus.com  # Use VICE emulator or similar

Links

qkumba/test 👑

AUTHOR: qkumba
DATE:   20210619                                                        
SIZE:   4096                                                            
FILES:  COM, Bash, Shell, Batch, Javascript, VBScript                   
SHA256: 5006a6fe23c5b23d59d16763a0e2b974ad761015cbb3d9c671c5894daa68afc2
SCORE:  12.0000

Score Breakdown

START END SIZE FILE OL EXEC OL TOTAL Description
0x0000 0x1000 4096 4096 COM
0x0000 0x1000 4096 4096 Code Section
0x0000 0x1000 4096 4096 4096x2=8192 12288 Bash/Shell
0x0000 0x1000 4096 4096 4096x2=8192 12288 Batch
0x0000 0x1000 4096 4096 4096x2=8192 12288 Javascript
0x0000 0x1000 4096 4096 4096x2=8192 12288 VBScript

Total Points / Host Size = Final Score

49152 / 4096 = 12.0000

RUN

       COM  $ dosbox test                                                       
Bash/Shell  $ ./test                                                            
     Batch  C:\> test.bat                                                       
Javascript  echo '<script src="./test"></script>' > test.html; firefox test.html
  VBScript  C:\> cscript test.vbs

Links