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软件逆向-这是一个 Frida V(伪)EH 示例(更新 x64 执行异常代码)

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周杰伦

文章分类 Android安全 CTF对抗 IOS安全 阅读数 : 660 阅读时长 : 9分钟

好久没有发技术贴了，看到好多，大大们都喜欢 VEH，小弟不才，一直学了好久的 frida，没学废。最近闲着蛋疼没事就研究了一下 frida 怎么 VEH。现在分享出来，抛转引玉器！

 

好了废话不多说，因为太简单了，没什么话可以说，直接上代码。

Talk is cheap. Show you My code.

顺便说一句，丢掉调试器，丢掉各种Loader各种Patcher吧，一个 frida 的 js 脚本就能干翻一切。
大佬们可以自己实现下 x64 下的代码（尝试下试硬件断点的方式，尝试下 VMP，TEP，WL，SE各种壳的替换机器码）

2023.1.14 更正个概念问题，免得误导大家(学院派)，我原来看到Process.setExceptionHandler这个接口函数名，认为是基于进程的VEH，有大佬说 frida 的底层实现应该还是属于 SEH 的。VEH 的 V 代表向量意思（向量化异常vectored exception handle），通常VEH是以双向链表的形式保存在堆里面。修改下 frida 源码让他变真的 V 也不是不可能。另外，本来想研究下硬件执行断点的，发现接口也没有提供 DRx 寄存器，所以就只能更新个 x64 的执行异常了（内存的，非硬件执行断点异常），仅供交流娱乐，高手勿喷(标题也文字游戏处理了一下，姑且叫做伪VEH 吧，效果至少像 VEH)。

python3 安装 frida

 
 

然后把这个 js 放 exe 同级目录，在目录下 cmd 或者 PS运行下面命令就行

 

frida -f 010Editor.exe -l ./frida-veh-010-bs.js

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/ / "use strict"
console.log( "\n" );
console.warn( "Frida.version = " + Frida.version);
console.log( "Frida.heapSize = " + Frida.heapSize);
console.warn( "Process.arch = " + Process.arch);
console.warn( "Process.platform = " + Process.platform);
console.log( "Process.pointerSize = " + Process.pointerSize);
console.log( "\n" );
console.error( " 这是一个 Frida VEH 010 Editor 的牛逼示例" )
console.error( " pip3 install frida frida-tools -i https://pypi.tuna.tsinghua.edu.cn/simple " );
console.error( " frida -f 010Editor.exe -l ./frida-veh-010-bs.js --no-pause " );
/ /
if (Process.platform = = "windows" && Process.arch = = "x64" ) {
     console.warn( "\n" , "Coming soon :) " , "\n" );
} else if (Process.platform = = "windows" && Process.arch = = "ia32" ) {
     / /
     var editor = Process.findModuleByName( "010Editor.exe" );
     console.log( "010 editor base: " , editor.base, typeof (editor.base));
     var sub_patchaddr = editor.base.add( 0x31f7fa );
     console.log( "010 editor VA: " , sub_patchaddr, typeof (sub_patchaddr));
     var buf = Memory.readByteArray(sub_patchaddr, 16 );
     const cc_origin = Memory.readU8(sub_patchaddr);
     console.log( "cc_origin: " , cc_origin, typeof (cc_origin));
     console.log(hexdump(sub_patchaddr, { offset: 0 , length: 32 , header: true, ansi: true }));
     / / VEH
     Process.setExceptionHandler(function (details) {
         console.log( "\n" , "setExceptionHandler ==> address: " , details.address);
         console.error(JSON.stringify(details));
         console.warn( "RVA: " , details.address.sub(editor.base));
         / /
         console.log( "eip[0]: " + ptr(Memory.readU8(details.context.eip)));
         / / restore
         / / Memory.writeU8(sub_patchaddr, 0x55 );
         Memory.writeU8(sub_patchaddr, cc_origin);
         console.warn( "eip[0]: " + ptr(Memory.readU8(details.context.eip)));
 
         console.log( "eip: " , details.context.eip);
         console.log( "pc: " , details.context.pc);
         console.log( "eax: " , details.context.eax);
         / /
         details.context.eax = 0xDB ;
         details.context.eip = ptr(details.context.eip).add( 0x7 );
         console.warn( "eax: " , details.context.eax);
         console.warn( "eip: " , details.context.eip);
         console.warn( "pc: " , details.context.pc);
         / / int3  0xCC
         Memory.protect(sub_patchaddr, 1 , 'rwx' );
         Memory.writeU8(sub_patchaddr, 0xcc );
         return true;
     });
     / / int3  0xCC
     Memory.protect(sub_patchaddr, 1 , 'rwx' );
     Memory.writeU8(sub_patchaddr, 0xcc );
} else {
     console.warn( "\n" , "This platform and architecture are not supported :( " , "\n" );
}

更新 x64 执行异常代码

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/ / "use strict"
console.log( "\n" );
console.warn( "Frida.version = " + Frida.version);
console.log( "Frida.heapSize = " + Frida.heapSize);
console.warn( "Process.arch = " + Process.arch);
console.warn( "Process.platform = " + Process.platform);
console.log( "Process.pointerSize = " + Process.pointerSize);
console.log( "\n" );
console.error( " 这是一个 Frida VEH 010 Editor 的牛逼示例" )
console.error( " pip3 install frida frida-tools -i https://pypi.tuna.tsinghua.edu.cn/simple " );
console.error( " frida -f 010Editor.exe -l ./frida-veh-010-bs.js --no-pause " );
/ /
if (Process.platform = = "windows" && Process.arch = = "x64" ) {
     / / console.warn( "\n" , "Coming soon :) " , "\n" );
 
     / / v13. 0.1 x64
     / / .text: 00007FF6E91CEFA0 010editor .exe:$ 36EFA0 #36E3A0
     var editor = Process.findModuleByName( "010Editor.exe" );
     console.log( "010 editor base: " , editor.base, typeof (editor.base));
     var sub_patchaddr = editor.base.add( 0x36efae );
     / /
     console.log( "010 editor VA: " , sub_patchaddr, typeof (sub_patchaddr));
     var buf = Memory.readByteArray(sub_patchaddr, 16 );
     const cc_origin = Memory.readU8(sub_patchaddr);
     console.log( "cc_origin: " , cc_origin, typeof (cc_origin));
     console.log(hexdump(sub_patchaddr.sub( 0xE ), { offset: 0 , length: 32 , header: true, ansi: true }));
     / /
     console.warn( "Process.id = " , Process. id );
     console.warn( "Process.isDebuggerAttached() = " , Process.isDebuggerAttached());
     console.warn( "Process.getCurrentThreadId() = " , Process.getCurrentThreadId());
     let threads = Process.enumerateThreads();
     for (let value in threads) {
         console.log(JSON.stringify(threads[value]));
     }
 
     / / VEH
     Process.setExceptionHandler(details = > {
         console.error(JSON.stringify(details));
         / /
         Memory.protect(details.memory.address, Process.pointerSize, 'rwx' );
         console.warn(JSON.stringify(details.memory));
         / /
         Memory.writeU32(details.context.rcx.add( 0x30 ), 1008 );
         Memory.writeU32(details.context.rcx.add( 0x3C ), 1 );
         Memory.writeU32(details.context.rcx.add( 0x44 ), 47419 );
         details.context.rax = 0xDB ;
         details.context.rip = ptr(details.context.rip).add( 0x7 );
         console.warn( "rax: " , details.context.rax);
         console.warn( "rip: " , details.context.rip);
         console.warn( "pc: " , details.context.pc);
 
         return true; / / goto PC
     });
 
     / / patchaddr 
     / / fetch decode execute
     Interceptor.attach(sub_patchaddr.sub( 0x0 ), {
         onEnter(args) {
             console.log( "\n" , 'onEnter' , JSON.stringify({
                 _rip: this.context.rip,
                 _pc: this.context.pc,
                 _pointerSize: Process.pointerSize,
                 mprotect_ret: Memory.protect(this.context.rip, 1 , 'rw-' ),
                 errno: this.errno,
                 _lr: this.returnAddress
             }, null, 2 ));
             console.log( "设置任意地址，执行异常 OJBK" );
         }
     });
 
} else if (Process.platform = = "windows" && Process.arch = = "ia32" ) {
     / /
     var editor = Process.findModuleByName( "010Editor.exe" );
     console.log( "010 editor base: " , editor.base, typeof (editor.base));
     var sub_patchaddr = editor.base.add( 0x31f7fa );
     console.log( "010 editor VA: " , sub_patchaddr, typeof (sub_patchaddr));
     var buf = Memory.readByteArray(sub_patchaddr, 16 );
     const cc_origin = Memory.readU8(sub_patchaddr);
     console.log( "cc_origin: " , cc_origin, typeof (cc_origin));
     console.log(hexdump(sub_patchaddr, { offset: 0 , length: 32 , header: true, ansi: true }));
     / / VEH
     Process.setExceptionHandler(function (details) {
         console.log( "\n" , "setExceptionHandler ==> address: " , details.address);
         console.error(JSON.stringify(details));
         console.warn( "RVA: " , details.address.sub(editor.base));
         / /
         console.log( "eip[0]: " + ptr(Memory.readU8(details.context.eip)));
         / / restore
         / / Memory.writeU8(sub_patchaddr, 0x55 );
         Memory.writeU8(sub_patchaddr, cc_origin);
         console.warn( "eip[0]: " + ptr(Memory.readU8(details.context.eip)));
 
         console.log( "eip: " , details.context.eip);
         console.log( "pc: " , details.context.pc);
         console.log( "eax: " , details.context.eax);
         / /
         details.context.eax = 0xDB ;
         details.context.eip = ptr(details.context.eip).add( 0x7 );
         console.warn( "eax: " , details.context.eax);
         console.warn( "eip: " , details.context.eip);
         console.warn( "pc: " , details.context.pc);
         / / int3  0xCC
         Memory.protect(sub_patchaddr, 1 , 'rwx' );
         Memory.writeU8(sub_patchaddr, 0xcc );
         return true;
     });
     / / int3  0xCC
     Memory.protect(sub_patchaddr, 1 , 'rwx' );
     Memory.writeU8(sub_patchaddr, 0xcc );
} else {
     console.warn( "\n" , "This platform and architecture are not supported :( " , "\n" );
}


更多【这是一个 Frida V(伪)EH 示例(更新 x64 执行异常代码)】相关视频教程：www.yxfzedu.com




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