DLL注入與解除安裝

dll注入可用於編寫外掛程式和病毒不易發現。

void cinjectdlltooldlg::startinject(char *path, int pid)

//在該程序申請記憶體，用來存放path資料
lpvoid dlladdr = virtualallocex(hpro, null, pathlen, mem_commit, page_readwrite);
if (!dlladdr)
//在申請的記憶體中寫入path
dword wnum = 0;
if (!writeprocessmemory(hpro, dlladdr, path, pathlen, &wnum))
//獲取loadlibrary函式位址
farproc pfun = getprocaddress(getmodulehandle("kernel32.dll"), "loadlibrarya");
if (!pfun)
dword dwpid;
handle hthread = createremotethread(hpro, null, 0, (lpthread_start_routine)pfun, dlladdr, 0, &dwpid);
if (!hthread)
dword errornum = getlasterror();
waitforsingleobject(hthread, infinite);
closehandle(hthread);
closehandle(hpro);
}

這個只適用於xp系統，win7系統不可以隨便createremotethread了，返回值一直為null

具體方法引用看雪：vista&win7下createremotethread應用的若干問題和解決方案

dll解除安裝與注入流程大體相同，先建立 程序快照找到相應的執行緒模組，獲取freelibrary位址，再建立遠端執行緒解除安裝

void uninjectdll(char *szdllname, dword dwpid)

//建立程序快照
handle hsnap = createtoolhelp32snapshot(th32cs_snapmodule,dwpid);
moduleentry32 me32 = ;
me32.dwsize = sizeof(moduleentry32);
bool isnext = module32first(hsnap,&me32);
bool flag = false;
while(isnext)
isnext = module32next(hsnap,&me32);
} if(flag == false)
closehandle(hsnap);
handle hpro = openprocess(process_all_access,false,dwpid);
farproc pfun = getprocaddress(getmodulehandle("kernel32.dll"),"freelibrary");
handle hthread = createremotethread(hpro,null,0,(lpthread_start_routine)pfun,me32.szmodule,0,null);
if(!hthread)
afxmessagebox("解除安裝成功");
waitforsingleobject(hthread,infinite);
closehandle(hthread);
closehandle(hpro);
}

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