miarey's Impossible PatchingMe

Author:
miarey

Language:
C/C++

Upload:
2025-10-02 16:45

Download

Platform:
Windows

Difficulty:
3.8

Quality:
4.2

Arch:
x86-64

Downloads:
73

Size:
775.50 KB

Writeups:
0

Comments:
14

Description

In this CrackMe, our goal is that when we enter any license, it shows "status: ok" and successfully generates the license.

Comments (14)
Writeups (0)

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trendcrusher on 2025-10-03 10:45: [Click to reveal]

miarey on 2025-10-03 12:56: @trendcrusher Just getting "status: ok" doesn’t mean you’ve succeeded; there should be both "status: ok" and a generated license.

sekumane on 2025-10-03 19:46: 0000000140001000 40 53 push ebx 0000000140001002 48 83 db 0x83 0000000140001004 ec db 0xec 0000000140001005 20 db 0x20 0000000140001006 48 8b d9 mov rbx, rcx 0000000140001009 48 8b c2 mov rax, rdx 000000014000100c 48 8d 0d 45 f3 0b 00 lea rcx, [0x1400c0358] 0000000140001013 0f 57 db 0xf, 0x57 0000000140001015 c0 db 0xc0 0000000140001016 48 8d 53 08 lea rdx, QWORD PTR [rbx+0x8] 000000014000101a 48 89 0b mov QWORD PTR [rbx], rcx 000000014000101d 48 8d 48 08 lea rcx, QWORD PTR [rax+0x8] CashApp: @slyemane

lexx on 2025-10-03 21:26: Hi And what should happen after entering the correct or incorrect password? The program freezes after the output "code:".

miarey on 2025-10-03 21:32: @lexx example license: 31 status: ok code: DIDNWOSNWODWO28373O

karabatik on 2025-10-04 09:55: Hey buddy, can you contact me on Discord? dc: karabatik

andreycha on 2025-10-04 10:29: .text:00000001400B2830 imul esi, 83h ; 'ѓ' .text:00000001400B2836 movzx eax, byte ptr [rdx] .text:00000001400B2839 add esi, eax .text:00000001400B283B inc rdx .text:00000001400B283E cmp rdx, r8 .text:00000001400B2841 jnz short loc_1400B2830 uint32_t calculate_hash(const char* str) { uint32_t hash = 0; const char* ptr = str; while (*ptr) { hash = hash * 0x83 + (uint8_t)*ptr; ptr++; } return hash; } .text:00000001400B287B cmp [rbx+30h], ecx //Check hash

andreycha on 2025-10-04 10:31: If you try to restore the original data. You will see that this data includes non-printable characters. I.e. enter this data from the console will not work. uint32_t target_hash = 0xFB59EA6E; std::vector get_solve_bytes() { std::vector result; for(uint32_t h = target_hash; h; h = (h - h % 0x83) / 0x83) result.insert(result.begin(), h % 0x83); return result; }

andreycha on 2025-10-04 10:31: result={0x0E,0x29,0x69,0x0A,0x5E} //correct data for hash

andreycha on 2025-10-04 10:32: [Click to reveal]

andreycha on 2025-10-04 10:34: Did you intentionally make it impossible to enter the correct data for calculating the hash from the console? @miarey

miarey on 2025-10-04 13:05: @andreycha add me dc: themiarey

lexx on 2025-10-04 21:55: [Click to reveal]

miarey on 2025-10-04 22:56: @lexx discord?

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crackmes.one

crackmes.one

miarey's Impossible PatchingMe