Palindromic Polyglot Replicator Crasher Downloader #170
Description
Entry Info
- Date: 15.1.2026
- BGGP Challenge: 1,2,3,4,5,6 plus bonus
- Name: dominikr
- Contact Info: Discord dominikr, github dominikfhnw
- Online Presence: -
- Writeup Link: https://github.com/dominikfhnw/bggp6-writeup/tree/main/allinone
File Info
- Target File Type: ELF/Linux x86 32bit
- Target File Size: 223 bytes
- SHA256 Hash: 78a039409f74b66af921f613d9edfd5f252a285e9b409f292e3cab2ecbe6effe
File Contents
f0VMRgEAAAAAAAAAALAFPQIABgAZsAU9GbAFPQQAAABbW82AajaJ406pIAABALAIzYCNGLEDsLvN
gLBAzYCTsCXNgLAL6xewNs0pwzZsLmFsL2Jpbi9jdXJsAC1MAFK7TLAFPVOzW1OzUVOJ4YDNAM2A
4YlTUbNTW7NTPQWwTLtSAEwtAGxydWMvbmliL2xhLmw2wynNNrAX6wuwgM0lsJOAzUCwgM27sAOx
GI2AzQiwAAEAIKlO44k2aoDNW1sAAAAEPQWwGT0FsBkABgACPQWwAAAAAAAAAAABRkxFfw==
Environment Info
Target Software and Version
Linux x86 32bit (or 64bit w/32bit support enabled).
Environment Setup
- Should work on any recent-ish Linux version.
- Requires curl in /bin/curl.
- the DOS COM polyglot can be tested with dosbox
- Mainly tested on Ubuntu 22.04
Additional Info
Most importantly: Do a rm 6 before you run the program a second time, as errors during creat() are not handled gracefully
Copy the file over to any modern-ish x86/x64 Linux distribution, and make it executable with chmod +x. Choose a filename ending with ".com" if you want to run it as a DOS program.
If you execute it without any further steps, it will create a copy of itself in a file called "6", it will download and display from "https://binary.golf/6/6", and it will kill your shell.
The last action might impede with your ability to see the downloaded output, so to stop the program from killing your shell you might want to type trap 'echo trapped QUIT' 3 beforehand.
Expected output:
$ trap 'echo trapped QUIT' 3
$ ./e.com
Another #BGGP6 download!!!!!! Hi @binarygolf https://binary.golf/6
trapped QUIT
$ ls -l 6 e.com
---------- 1 dominikr dominikr 223 Jan 15 15:27 6
-rwxr-xr-x 1 dominikr dominikr 223 Jan 15 15:24 e.com*
$ dosbox e.com
6 [in separate dosbox window]
See the writeup for more info