hook技术的应用-过某平台作弊检测

上回书说完检测方法就戛然而止了，这篇文章就来谈谈如何过检测。

首先回顾一下平台对作弊的检测方法，检测开始前平台准备一个单位列表，在列表中，有玩家可见的单位和玩家视野外的单位。

地图脚本会强迫玩家点击每个在列表里的单位。

如果玩家选中了不可见的单位（视野外或者隐身单位）或者玩家没有选中可见单位 都会提高作弊的置信程度

for _,__0x0150__ in ipairs(__0x7633__[__0x2073__]) do
__0x0519__:__0x1929__(__0x0150__)
local __0x7637__=__0x0015__.__0x0941__(__0x3247__.selection())
if __0x7637__==__0x0150__ then
__0x2740__.__0x7611__=__0x2740__.__0x7611__+1
__0x0288__.info('!hack! __0x2740__.__0x7611__ + 1',__0x2740__.__0x7611__)
if __0x7637__==__0x0196__ then
__0x2740__.__0x7613__=__0x2740__.__0x7613__+1
__0x0288__.info('!hack! __0x2740__.__0x7613__ + 1',__0x2740__.__0x7613__)
end
end

那么如何来bypass整个检测呢，最直接的方法就是不开启视野外点击这个功能，只在大地图上显示模型。

当然这样的方法是消极的做法。下面上我的解决方案。

既然地图脚本使用lua来写的，肯定有个模块从外部调用了war3的内部函数来点击单位，只要找到被外部的函数地址剩下的就好办了。

经过分析 其实是 War3Plugin.dll 调用了 位于game.dll+0x425FD0处的函数 为了方便称为'selectfunc'。

接下来就有多种做法，其中之一是根据传给selectfunc的参数找到该单位的地址，通过判断该单位是否可见来决定跳转是否直接返回。

当然这个方法非常复杂，且效率不高，每个单位都要判断一次。

我采用的方法更加简单明了，首先当然是hook这个函数

函数之间存在着一些间隙，在间隙中可以放置一些额外的代码，替换到函数入口的push指令 jmp到设计好的代码地址。

在6F425FC6处调用bypass函数 该函数的主要作用是暂时关闭视野外点击的作弊功能，在一段时间后再开启。

返回后是一条push指令 因为之前替换掉了selectfunc第一条指令 需要再给它补上。

然后又是一个跳转 跳转到函数中 正常执行。

这样的作法被叫做hook，hook的释义是钩子，这个函数一经调用 这个钩子就能捕获到这一信息。

那么函数具体应该如何实现？该函数在玩家正常点击时也会被调用，总不能一点击就关闭作弊功能。这时候就要根据程序的堆栈来判断该函数是否从外部被调用。

用调试器附加war3，在该函数开头处设下断点，随意选中一个单位，此时程序已经被中断。

观察调用堆栈发现最近的返回地址在 [esp + 0x30] 处 那么以后只要判断栈中存放的地址是否指向程序内部即可。（事实上 game.dll 中多个过程调用了这个函数，需要逐一进行处理）

即如果是从内部调用就直接return 如果不是则暂时关闭作弊功能1秒

下面来看一看过检测的效果

[info]: !hack! __0x2740__.__0x7612__ + 1    1
[info]: !hack! __0x2740__.__0x7612__ + 1    2
[info]: !hack! __0x2740__.__0x7612__ + 1    3
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[info]: !hack! __0x2740__.__0x7612__ + 1    11
[info]: !hack! __0x2740__.__0x7612__ + 1    12
[info]: !hack! __0x2740__.__0x7612__ + 1    13
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[info]: !hack! __0x0216__.__0x7613__    0
[info]: !hack! __0x0216__.__0x7614__    0
[info]: !hack! __0x0216__.__0x7615__    0
[info]: !hack! __0x0216__.__0x7612__    0
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[info]: !hack! __0x0216__.__0x7612__    118
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[info]: !hack! __0x0216__.__0x7616__    0
[info]: !hack! __0x0216__.__0x7613__    0
[info]: !hack! __0x0216__.__0x7614__    0
[info]: !hack! __0x0216__.__0x7615__    0
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[info]: !hack! __0x0216__.__0x7616__    0
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[info]: !hack! __0x0216__.__0x7615__    0
[info]: !hack! __0x0216__.__0x7612__    0
[info]: !hack! __0x0216__.__0x7616__    0
[info]: !hack! __0x0216__.__0x7613__    0
[info]: !hack! __0x0216__.__0x7614__    0
[info]: !hack! __0x0216__.__0x7615__    0
[info]: !hack! __0x0216__.__0x7612__    149
[info]: !hack! __0x0216__.__0x7616__    0
[info]: !hack! __0x0216__.__0x7613__    0
[info]: !hack! __0x0216__.__0x7614__    0
[info]: !hack! __0x0216__.__0x7615__    0
[info]: !hack! __0x0216__.__0x7612__    149
[info]: !hack! __0x0216__.__0x7616__    0
[info]: !hack! __0x0216__.__0x7613__    0
[info]: !hack! __0x0216__.__0x7614__    0
[info]: !hack! __0x0216__.__0x7615__    0
[info]: !hack! __0x0216__.__0x7612__    149
[info]: !hack! __0x0216__.__0x7616__    0
[info]: !hack! __0x0216__.__0x7613__    0
[info]: !hack! __0x0216__.__0x7614__    0
[info]: !hack! __0x0216__.__0x7615__    0
[info]: !hack! __0x0216__.__0x7612__    149
[info]: !hack! __0x0216__.__0x7616__    0
[info]: !hack! __0x0216__.__0x7613__    0
[info]: !hack! __0x0216__.__0x7614__    0
[info]: !hack! __0x0216__.__0x7615__    0
[info]: !hack! __0x0216__.__0x7612__    149
[info]: !hack! __0x0216__.__0x7616__    0

bypass成功