solved new crackme

This commit is contained in:
Chenx221 2024-10-18 17:38:53 +08:00
parent ba48466dac
commit 62a9a41330
Signed by: chenx221
GPG Key ID: D7A9EC07024C3021
12 changed files with 388 additions and 0 deletions

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Name: Button Race
Author: RooJ
Level: 1
Language: VB6
Aim:
Create a keygen so that anyone can register the game with any password. Also make a tutorial of how you did it and send to me: quibus_umbra@homail.com :).
Comments:
Ok.. i got bored and decided to turn an old game i made years ago into a simple crackme. The game itself is quite badly coded so try to ignore it and concentrate on cracking :P. I warn you that i did rush this one out as a bit of fun so dont be too dissapointed with it.
*Note for the game, if you win a race your bet is doubled and sent back to you. If you lose you just lose your bet.
Happy cracking.
RooJ
==================
For every coder theres an equal and opposite decoder.

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1x2y-3412+lmn

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这么抽象的"赛马"游戏
打死也不会再研究pcode了这反编译器给的结果全靠猜
解决方法:
在程序同目录建立`Reginfo.roo`文件,内容`1x2y-3412+lmn`
程序会基于此判断是否注册
细节:
```vb
Private Sub Command1_Click() '406474
'Data Table: 401EC0
Dim var_138 As Variant
Dim var_DA As Integer
Dim var_19C As Variant
Dim var_18C As Variant
loc_40610E: var_EC = CVar(Len(Me.txtname.Text)) 'Variant
loc_406120: var_C4 = CVar(Me.txtname) 'Variant
loc_40612C: var_A4 = CVar(Me.txtreply) 'Variant
loc_406130: On Error Goto loc_4063F3
loc_406145: For var_168 = 1 To Len(global_52): var_FC = var_168 'Variant
loc_406180: var_D8 = CVar(Val(CStr((Asc(CStr(Mid(global_52, CLng(var_FC), 1))) * 3)))) 'Variant
loc_4061FE: var_94 = var_94 & Hex(CVar(Val(CStr((var_D8 + CVar(CInt(Val(CStr((Asc(CStr(Mid(var_C4, CLng(var_FC), 1))) * 3)))))))))) 'Variant
loc_406211: Next var_168 'Variant
loc_406226: For var_1BC = 1 To Len(var_C4): var_10C = var_1BC 'Variant
loc_40624D: var_DA = Asc(CStr(Mid(var_C4, CLng(var_EC), 1)))
loc_406274: var_B4 = var_B4 & Right(var_D8, 2) 'Variant
loc_406287: var_EC = (var_EC - 1) 'Variant
loc_40628E: Next var_1BC 'Variant
loc_4062AD: For var_1C0 = CByte(1) To CByte(Len(var_94)): var_10E = var_1C0 'Byte
loc_4062DC: If (CVar(Val(CStr((1 + 1)))) > Len(var_B4)) Then
loc_4062E4: var_EC = 1 'Variant
loc_4062E8: End If
loc_406306: var_18C = CVar(var_C8) & Mid(var_94, CLng(var_10E), 1)
loc_40630A: var_19C = 2
loc_406327: var_C8 = CStr(var_18C & Mid(var_B4, CLng(var_EC), var_19C))
loc_406341: var_138 = (var_EC + 1)
loc_406345: var_EC = var_138 'Variant
loc_40634C: Next var_1C0 'Byte
loc_406355: Randomize(var_138)
loc_40638B: Me.lblquery.Caption = CStr(CVar(Call Proc_2_0_404A90(&H186A0, &HDBBA0)))
loc_4063A2: If (CVar(var_C8) = var_A4) Then
loc_4063A5: Call makereg()
loc_4063B7: Me.Global.Unload Me
loc_4063E0: MsgBox("Thank you for registering this program, and enjoy. Please restart the game to get full registered use.", &H40, "Registered", var_18C, var_19C)
loc_4063F0: GoTo loc_406471
loc_4063F3: ' Referenced from: 406130
loc_4063F3: End If
loc_406417: var_138 = CVar("Sorry, the password you entered was incorrect." & vbCrLf & "To buy this program for only £253.27 please contact our sales department via email: quibus_umbra@hotmail.com") 'String
loc_40641A: MsgBox(var_138, &H10, "Incorrect", var_18C, var_19C)
loc_406430: Randomize(var_138)
loc_406466: Me.lblquery.Caption = CStr(CVar(Call Proc_2_0_404A90(&H186A0, &HDBBA0)))
loc_406471: ' Referenced from: 4063F0
loc_406471: Exit Sub
End Sub
```
没什么好的思路所以瞟了瞟x64dbg
```
150C05850105C50205150E05F50105E50305150D50705150D05D50 //True Reply
caonima //Name
50505050505050 //这个不好说明看下面代码vd8
sb //Reply
1C81C21EF1E31D71DD //不好说没看下面代码v94
556342 //随机值显示在软件窗口上部分label
```
得到组合关系后直接开vs
```c#
if(args.Length != 2)
{
Console.WriteLine("Usage: sp_keygen.exe <name> <random value>");
}
else
{
string s1 = args[1];
string name = args[0];
string reply = "";
int length = Math.Min(name.Length, s1.Length);
int vd8 = 0;
string vd8s = "";
string v94 = "";
for (int i = 0; i < length; i++)
{
vd8 = s1[i] * 3;
int vd9 = name[i] * 3;
int n = vd8 + vd9;
v94 += n.ToString("X");
}
for (int k = 0; k < name.Length; k++)
{
vd8s += vd8.ToString()[^2..];
}
for (int i = 0, j = 0; i < v94.Length; i++, j++)
{
reply += v94[i].ToString() + vd8s[j] + vd8s[j + 1];
if (i == vd8s.Length - 2)
{
j = -1;
}
}
Console.WriteLine(reply);
}
```
彩蛋:
我留了一份`Bracing_Patched.exe`赛马无敌版

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{D6614743-D01E-4899-A5E7-B4E45BD1B033}.Release|x64.ActiveCfg = Release|Any CPU
{D6614743-D01E-4899-A5E7-B4E45BD1B033}.Release|x64.Build.0 = Release|Any CPU
{D6614743-D01E-4899-A5E7-B4E45BD1B033}.Release|x86.ActiveCfg = Release|Any CPU
{D6614743-D01E-4899-A5E7-B4E45BD1B033}.Release|x86.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
EndGlobalSection
GlobalSection(ExtensibilityGlobals) = postSolution
SolutionGuid = {01ED3EE8-E89A-4A27-AF68-EF2490CB6BD7}
EndGlobalSection
EndGlobal

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namespace sp_keygen
{
internal class Program
{
static void Main(string[] args)
{
if(args.Length != 2)
{
Console.WriteLine("Usage: sp_keygen.exe <name> <random value>");
}
else
{
string s1 = args[1];
string name = args[0];
string reply = "";
int length = Math.Min(name.Length, s1.Length);
int vd8 = 0;
string vd8s = "";
string v94 = "";
for (int i = 0; i < length; i++)
{
vd8 = s1[i] * 3;
int vd9 = name[i] * 3;
int n = vd8 + vd9;
v94 += n.ToString("X");
}
for (int k = 0; k < name.Length; k++)
{
vd8s += vd8.ToString()[^2..];
}
for (int i = 0, j = 0; i < v94.Length; i++, j++)
{
reply += v94[i].ToString() + vd8s[j] + vd8s[j + 1];
if (i == vd8s.Length - 2)
{
j = -1;
}
}
Console.WriteLine(reply);
}
return;
}
}
}

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<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<OutputType>Exe</OutputType>
<TargetFramework>net8.0</TargetFramework>
<ImplicitUsings>enable</ImplicitUsings>
<Nullable>enable</Nullable>
</PropertyGroup>
</Project>