I ranked last in ELF64....
CianLR is a Google software developer, according to his/her GitHub profile.
BGGP 4 (2023), Result has been announced on 31th Oct
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 Oct 31 2023, 03:59 PM
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#41
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329 posts Joined: Jun 2023 
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I ranked last in ELF64.... CianLR is a Google software developer, according to his/her GitHub profile. flashang liked this post
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Dec 9 2023, 05:46 PM
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#42
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329 posts Joined: Jun 2023
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I plan to reverse ic3queen's UEFI App in the next few weeks, I will then publish my finding on here.
But then I haven't even try to create "Hello,world " UEFI App..... Stay tuned. https://haunted.computer/@ic3qu33n@infosec....044987010309755 QUOTE Yo @binarygolf, here’s my entry 0 for BGGP4 — a self-replicating UEFI app.
This is the first submission of the collab entry that I’m working on w @netspooky We’ll be golfing this lil self-rep app so expect smaller and smaller entries to follow. Entry 0 is a UEFI self-rep app I wrote in nasm-syntax x86 asm (1480 bytes) xoxo: *** TVoAAVBFAABkhgMAAAAAAAAAAAAAAAAAoAAGAgsCAAD7AgAAzAAAAAAAAAAAAgAAAAIAAAAAAAAAAAAABAAAAAQAAAAAAAAAAAAAAAAAAAAAAAAAyAUAAAACAAAAAAAACgAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAYAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAudGV4dAAAAPsCAAAAAgAA+wIAAAACAAAAAAAAAAAAAAAAAAAgAFBgLmRhdGEAAADMAAAA/AQAAMwAAAD8BAAAAAAAAAAAAAAAAAAAQAAA0C5yZWxvYwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABVSInlSIHswAAAAEiJDQIDAABIiRXjAgAASIsd3AIAAEiLW2BIiR3ZAgAASIsFygIAAEiLQEBIiQXPAgAASIsdwAIAAEiLu5gAAABIiw3CAgAATI0FwwIAAMdFwKExG1tmx0XEYpVmx0XG0hFIuI4/AKDJaXI7SIlFyEiNVcBMiw2PAgAAU//XW0iDOAB1JkiLBYYCAABIi1gYSIkdgwIAAEiLBXQCAABIi1hISIkdeQIAAOsiTI0t2gIAAOgFAAAA6SwCAABMiepIiw08AgAASItBCP/Qw0iLHSYCAABIiw0/AgAAx0WgIltOlmbHRaRZZGbHRabSEUi4jjkAoMlpcjtIiUWoSI1VoEyNBSsCAABMiw38AQAATTHSSIuDmAAAALsBAAAAU//QW0iDOAB1hEiLBQQCAABIi0AISIsN+QEAAEiNFeoBAAD/0EiJRfhIg334AA+FWv///0iLBdIBAABIi0AISIsNxwEAAEiNFdABAABMjQXxAQAAQbkBAAAATTHS/9BIiUX4SIN9+AAPhSD///9IiwWYAQAASItACEiLDY0BAABIx0WIAAAAAEiNVYhMjQXYAQAASbkDAAAAAAAAgEjHRCQgAAAAAP/QSIlF+EiDffgAD4XX/v//SItFiEiJBWMBAABIiwUUAQAASItAQEiLDWkBAABIixUqAQAATI0FSwEAAP/QSIlF+EiDffgAD4Wb/v//SIsFIwEAAEiLQCBIiw0YAQAASI0V+QAAAEyLBRoBAAD/0EiJRfhIg334AA+Fav7//0iLBfoAAABIi0AoSIsN7wAAAEiNFcgAAABMiwXpAAAA/9BIiUX4SIN9+AAPhTn+///rAEyNLTsBAADoPP7//+scTInoSItAEEyJ6f/QSIlF+EiDffgAD4UO/v//w0yLLZ0AAADo2P///0iLHUkAAABIi0NISIsNjgAAAP/QSIlF+EiDffgAD4Xe/f//TIstZgAAAOip////TTHtTIstRwAAAOia////SIHEwAAAAF3DAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAABcAHMAZQBsAGYALQByAGUAcAAtAGcAbwBsAGYALgBlAGYAaQAAADQAAAB1AGgAIABvAGgAaABoACAARQBGAEkAIABlAHIAcgBvAHIAIAANAAoAAAA0AA0ACgAAAA== This post has been edited by MatQuasar: Dec 9 2023, 05:47 PM |
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Dec 10 2023, 02:35 AM
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#43
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329 posts Joined: Jun 2023
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This is an update to the ic3queen UEFI app, I try to run it from EFI Shell within QEMU.
Looks like it is not successful. No new file created.  This is the command line I used: CODE "C:\Program Files\qemu\qemu-system-x86_64" -bios OVMF.fd -hda fat:rw:LYN/ I downloaded OVMF.fd from the Internet, it is an emulated UEFI firmware for virtual machine. A fast hexdump to the ic3queen.EFI executable found that there is no DOS Stub, just MZ signature followed by PE header. Wow. Is there anything wrong with my settings? This post has been edited by MatQuasar: Dec 10 2023, 03:23 AM |
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Dec 10 2023, 01:02 PM
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#44
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329 posts Joined: Jun 2023
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Ah, finally I solved the ic3queen's problem. I know why it didn't work previously.
From disassembler by IDA Free, I found a path name called "\\self-rep-golf.efi", which means the EFI app must be named exactly that.  Now it works as expected:  And from hexdump again, I can see 3 sections: code, data and reloc(ation). Puzzle solved! |
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Dec 11 2023, 10:00 PM
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#45
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329 posts Joined: Jun 2023
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Another UEFI app entry for BGGP4 is by a German, written in Rust, reduced to 7KB in size from 40KB. But he/she didn't win the smallest UEFI category, because ic3queen's is only 1,480 bytes (written in NASM).
https://www.ytvwld.de/blog/bggp23.html  |
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