CppDepend2023.1分析

       这是一个.Net程序，使用 dotfuscator进行了混淆。虽然混淆了，但是不影响调试，可以直接使用dnspy进行调试。Help>License Information可以作为调试的入口点。

       通过实时调试可以很轻松的找到校验授权的代码，在CppDepend.Core.dll中。可以将其修改为总是返回true。你可以通过搜索下面这个字符串快速的抵达目标位置：

<RSAKeyValue><Modulus>js+lphb91jLdPAiud7BvAgtTU2KIiLSrt/UitlMEEdxUQpDD4/+TxoO9XimXrcknJAVrXU8uWaBnbgA/tJt/0R2p2MzAGRn5KOUZWtNDk8xtYm0muj9J+JxUqf2xcpmSPfeehmxhI8cnk7X8vJYVbbjEjgx7BEcJMyBWYz4E00s=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>

internal static bool a(string A_0, out aiq A_1)
    {
        A_1 = null;
        a9a a9a;
        if (!l4.a(A_0, out a9a))
        {
            a9a = null;
        }
        bool flag;
        try
        {
            using (StringReader stringReader = new StringReader(A_0))
            {
                using (XmlReader xmlReader = new XmlTextReader(stringReader))
                {
                    if (!bgz.a(xmlReader, a9a, out A_1))
                    {
                        flag = false;
                    }
                    else
                    {
                        string text = A_1.a();
                        string text2 = "<RSAKeyValue><Modulus>js+lphb91jLdPAiud7BvAgtTU2KIiLSrt/UitlMEEdxUQpDD4/+TxoO9XimXrcknJAVrXU8uWaBnbgA/tJt/0R2p2MzAGRn5KOUZWtNDk8xtYm0muj9J+JxUqf2xcpmSPfeehmxhI8cnk7X8vJYVbbjEjgx7BEcJMyBWYz4E00s=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";
                        bool flag2 = ms.a(text2, A_0, text);   // 这就是我们要修改的函数...
                        flag = flag2;
                    }
                }
            }
        }
        catch
        {
            flag = false;
        }
        return flag;
    }

       修改

internal static class ms
{
    // Token: 0x0600417D RID: 16765 RVA: 0x0012BFD8 File Offset: 0x0012A1D8
    internal static bool a(string A_0, string A_1, string A_2)
    {
        byte[] array;
        return ms.a(A_1, out array) == aye.a && ms.a(A_0, A_2, array);
    }
}

     为：

internal static class ms
{
    // Token: 0x0600417D RID: 16765 RVA: 0x00004DD4 File Offset: 0x00002FD4
    internal static bool a(string A_0, string A_1, string A_2)
    {
        return true;
    }
}

     这可以使得不管什么license文件都是有效的license文件，然后找到license保存的函数，这个函数跟前面搜索的字符串使用处是挨着的，将有效期改得特别长，即可：

// Token: 0x060035E1 RID: 13793 RVA: 0x00102968 File Offset: 0x00100B68
    private static bool a(XmlReader A_0, a9a A_1, out bga A_2)
    {
        bool flag = A_1 != null;
        A_2 = null;
        string text = "EvaluationResponse";
        string text2 = "DateRegister";
        string text3 = "DateExpire";
        string text4 = "MoreEvalAlreadyAsked";
        string text5 = "HardwareID";
        string text6 = "HardwareIDUnhashed";
        string text7 = "EvalNbDaysLeftToShowActivationForm";
        string text8 = "EvalNbDaysLeftToShowAskForMoreEvalButton";
        string text9 = "CanReEvalNbDaysAfterEvalExpiration";
        string text10 = "EvalRegisteredWithProductVersion";
        A_0.ReadToDescendant(text);
        string text11;
        string text12;
        if (flag)
        {
            text11 = A_1.b();
            text12 = A_1.c();
            A_0.ReadToDescendant(text2);
        }
        else
        {
            A_0.ReadToDescendant(text5);
            text11 = A_0.ReadString();
            if (!text11.b(36))
            {
                return false;
            }
            a46.b(A_0);
            if (A_0.Name != text6)
            {
                return false;
            }
            text12 = A_0.ReadString();
            if (!text12.b(289))
            {
                return false;
            }
            a46.b(A_0);
        }
        if (A_0.Name != text2)
        {
            return false;
        }
        aaf aaf;
        if (!aaf.a(A_0.ReadString(), out aaf))
        {
            return false;
        }
        a46.b(A_0);
        if (A_0.Name != text3)
        {
            return false;
        }
        string text13 = A_0.ReadString();
        text13 = text13.Substring(0, text13.Length - 4) + "2050";  // 这可以让你的试用时长变得特别长
        aaf aaf2;
        if (!aaf.a(text13, out aaf2))
        {
            return false;
        }
        if (aaf2.d() <= aaf.d())
        {
            return false;
        }
        a46.b(A_0);
        if (A_0.Name != text4)
        {
            return false;
        }
        bool flag2;
        if (!bool.TryParse(A_0.ReadString(), out flag2))
        {
            return false;
        }
        int num;
        if (!ao3.a(A_0, text7, out num))
        {
            return false;
        }
        int num2;
        if (!ao3.a(A_0, text8, out num2))
        {
            return false;
        }
        int num3;
        if (!ao3.a(A_0, text9, out num3))
        {
            return false;
        }
        if (num < num2)
        {
            return false;
        }
        if (flag)
        {
            a46.b(A_0);
            if (A_0.Name != text10)
            {
                return false;
            }
            Version version;
            if (!Version.TryParse(A_0.ReadString(), out version))
            {
                return false;
            }
            A_2 = new ayi(aaf, aaf2, flag2, num, num2, num3, version, A_1);
        }
        else
        {
            A_2 = new bga(aaf, aaf2, flag2, text11, text12, num, num2, num3);
        }
        return true;
    }

       如果你觉得evaluate remain days这种字符串很碍眼的话，也可以直接把它改成其它的。保存的时候，需要勾选"MD写入选项”的所有参数以确保不会破坏dll本身。

 原版下载：

链接: https://pan.baidu.com/s/1pUuc49bvtiOIyvFJ-nAjcw?pwd=jnx7 提取码: jnx7