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🔒 WolvCTF 2023 / 🩸-reverse-atari_magic
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Sutx BOT 03/17/2023 1:39 PM
atari_magic - 500 points
Category: Reverse Description: Retrocomputing fun. This challenge is authored and sponsored by Caesar Creek Software. Files:Tags: Wade#3516
03/17/2023 1:39 PM
Sutx pinned a message to this channel. 03/17/2023 1:39 PM
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Sutx BOT 03/17/2023 7:37 PM
@Violin wants to collaborate 🤝
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Sutx BOT 03/17/2023 11:12 PM
@4n0nym4u5 wants to collaborate 🤝
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Sutx BOT 03/18/2023 1:03 AM
@crazyman ai wants to collaborate 🤝
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Sutx BOT 03/18/2023 3:01 AM
@TheBadGod wants to collaborate 🤝
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TheBadGod 03/18/2023 3:01 AM
wtfc{}_nf3mn_n1l34yskd40 (edited)
03:01
just gotta figure out the order lol
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TheBadGod
used /ctf submit
Sutx BOT 03/18/2023 3:14 AM
🩸 Well done, you got first blood!
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sahuang 03/18/2023 5:18 AM
did you use an emulator or just grepped a string and scrambled?
05:18
couldnt get tos stuff decompiled even
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TheBadGod 03/18/2023 5:18 AM
i disassembled the stuff, saw that there are a bunch of sus checks
05:19
like it loads d1 from an offset of a1 move.b offset(a1), d1, then performs some action on d1 and compares it to another constant byte
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sahuang 03/18/2023 5:19 AM
ooh
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TheBadGod 03/18/2023 5:19 AM
there were just 5 actions, add, sub, xor, ror, rol; so it was easy to reverse
05:19
and then just had to look at the offset (because they were not in order) to determine the correct index
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sahuang
couldnt get tos stuff decompiled even
TheBadGod 03/18/2023 5:20 AM
yeah same, just got rid of the first 0x1c bytes and told ida to disassemble m68k
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sahuang 03/18/2023 5:20 AM
i see peepoo nice to know, i prob gonna upsolve later for that disassembld stuff analysis
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