Frida 逆向hook方法传参

Posted 2022-08-06 dounine

C++方法如下
main.cpp

#include <iostream>
#include <Windows.h>

void showAge(int age) 
    std::cout << age << std::endl;


int main() 
    SetConsoleTitle("Demo");
    showAge(18);
    std::cin.get();
    return 0;

运行，用32dbg找到showAge方法的偏移地址为：0x128F
小知识点：push dword ptr [dbp+8]可转化16进制为0xff75(N)

main.ts

import log from "./logger.js";
let address = Process.findModuleByName("demo.exe");
let codeSize = Process.pageSize;
let imp: NativePointer = Memory.alloc(codeSize);
Memory.patchCode(imp, codeSize, code => 
   let writer = new X86Writer(code, pc: imp);
   writer.putPushReg("ebp"); 				//push ebp
   writer.putMovRegReg("ebp", "esp");	    //push ebp, esp
   writer.putBytes(new Uint8Array([0xff, 0x75, 8]).buffer as ArrayBuffer); //push dword ptr ss:[ebp + 8]
   writer.putCallAddress(address?.base.add(0x128F)!);	//call 0xxxx128F
   writer.putAddRegImm("esp", 4); 		//add esp, 4
   writer.putMovRegReg("esp", "ebp");	//mov esp, ebp
   writer.putPopReg("ebp"); 			//pop ebp
   writer.putRet();						//ret
   writer.flush();
);
let callMemFun = new NativeFunction(imp, 'void', ['int']);
let result = callMemFun(4);

运行

frida -l .\\_agent.js Demo.exe