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作者:anhkgg
日期:2019年11月3日
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很多时候,可能会对某个软件进行DLL劫持。
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而这个软件是否存在DLL劫持漏洞,需要去分析验证。
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比如通过IDA查看导入的DLL,或者LoadLibrary的DLL,然后慢慢排除某些KnownDlls,排除某些绝对路径加载的DLL...
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或者通过Windbg分析。
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虽然技术难度不高,但是挺费事的。
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本篇文章分享我找DLL劫持的方法,不一定是最佳,不过很方便。
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1
首先,通过windbg启动软件,设置(默认开启的):
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Debug->Event Filters->Load module,勾选Output&https://bbs.pediy.com/3;
然后go运行。这样我们可以看到运行后,软件导入表导入的DLL,以及LoadLibrary加载的DLL的所有文件,如下所示:
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ModLoad: 75090000 750cb000 C:\Windows\system32\rsaenh.dll&https://bbs.pediy.com/3;
ModLoad: 757c0000 757cc000 C:\Windows\system32\CRYPTBASE.dll&https://bbs.pediy.com/3;
ModLoad: 778b0000 778da000 C:\Windows\system32\imagehlp.dll&https://bbs.pediy.com/3;
ModLoad: 77860000 778a5000 C:\Windows\system32\WLDAP32.dll&https://bbs.pediy.com/3;
2
写一个测试的DLL,只用下面的代码:
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BOOL APIENTRY DllMain( HMODULE hModule,&https://bbs.pediy.com/3;
DWORD ul_reason_for_call,&https://bbs.pediy.com/3;
LPVOID lpReserved&https://bbs.pediy.com/3;
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{&https://bbs.pediy.com/3;
char path[MAX_PATH] = { 0 };&https://bbs.pediy.com/3;
switch (ul_reason_for_call)&https://bbs.pediy.com/3;
{&https://bbs.pediy.com/3;
case DLL_PROCESS_ATTACH:&https://bbs.pediy.com/3;
OutputDebugStringA(path);&https://bbs.pediy.com/3;
OutputDebugStringA("success!");&https://bbs.pediy.com/3;
MessageBoxA(NULL, "success!", "Tips", MB_OK);&https://bbs.pediy.com/3;
ExitProcess(0);&https://bbs.pediy.com/3;
break;&https://bbs.pediy.com/3;
case DLL_THREAD_ATTACH:&https://bbs.pediy.com/3;
case DLL_THREAD_DETACH:&https://bbs.pediy.com/3;
case DLL_PROCESS_DETACH:&https://bbs.pediy.com/3;
break;&https://bbs.pediy.com/3;
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return TRUE;&https://bbs.pediy.com/3;
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然后讲DLL改名成劫持目标DLL,放到软件目录下,运行验证即可。
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如果出现提示success
则表示该目标DLL劫持成功。
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3
如果DLL太多了,一一验证排除肯定很麻烦,所以程序员又要写代码了。
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写一个自动批量验证的工具,基本思路如下:
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- 把windbg拿到的dll列表保存下来
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- 准备好测试DLL,DLL中加入写log功能
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- 分析dll列表,一一把测试DLL拷贝为目标dll,启动软件
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- 然后把log提取出来,可以看到成功劫持的dll
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工具界面如上,一键验证所有DLL,分分钟拿到结果。
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工具会分享到https://github.com/anhkgg/anhkgg-tools下,欢迎使用,如有bug,请联系我。
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欢迎关注公众号:汉客儿
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最后于 2019-11-4 16:11
被Angelxf编辑
,原因:
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