强网拟态REV-(fastjsoN)wp

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我是靠谱客的博主内向酸奶，最近开发中收集的这篇文章主要介绍强网拟态REV-(fastjsoN)wp，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

fastjsoN

依照这个链接可以知道跟之前长安杯和看雪KCTF题目差不多
先用脚本恢复一下符号

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0xAD, 0xB9, 0xA0, 0xC7, 0xB9, 0xA1, 0xAF, 0xC3, 0x05, 0xC7, 
0xBD, 0x0F, 0xAD, 0xB7, 0xA0, 0xC8, 0xBB, 0xA1, 0xAF, 0xC3, 
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0xEA, 0x0D, 0x38, 0x15, 0x01, 0x00, 0x00, 0x04, 0xEE, 0x00, 
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0xD1, 0xB5, 0x47, 0xC9, 0x38, 0xE6, 0x00, 0x00, 0x00, 0x42, 
0xEB, 0x00, 0x00, 0x00, 0xC5, 0x24, 0x01, 0x00, 0xCA, 0x04, 
0x17, 0x01, 0x00, 0x00, 0x11, 0x39, 0x18, 0x01, 0x00, 0x00, 
0x0E, 0x38, 0xE3, 0x00, 0x00, 0x00, 0xC6, 0x38, 0x18, 0x01, 
0x00, 0x00, 0xF0, 0xCF, 0xE9, 0xBD, 0x70, 0xAA, 0xEA, 0x0D, 
0x38, 0x15, 0x01, 0x00, 0x00, 0x04, 0xEE, 0x00, 0x00, 0x00, 
0xEF, 0x29, 0x04, 0x19, 0x01, 0x00, 0x00, 0xCC, 0xC7, 0xC8, 
0xA9, 0xEA, 0x0E, 0x38, 0x15, 0x01, 0x00, 0x00, 0x04, 0x1A, 
0x01, 0x00, 0x00, 0xEF, 0x0E, 0x29, 0x38, 0x15, 0x01, 0x00, 
0x00, 0x04, 0xEE, 0x00, 0x00, 0x00, 0xEF, 0x29, 0xDE, 0x03, 
0x76, 0x11, 0x03, 0x21, 0x3B, 0x08, 0x54, 0x17, 0x4F, 0x3F, 
0x40, 0x26, 0x3B, 0x09, 0x21, 0x1D, 0x3F, 0x09, 0x3C, 0x00, 
0x00, 0x00, 0xDD, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
0x00, 0x00, 0x00, 0x00

恢复之后，根据附件字符串知道是2021.3.27版本，github上拉取一下，并且根据链接修改脚本

//#define DUMP_BYTECODE (1) 
#define DUMP_BYTECODE (1) 

//#define DUMP_READ_OBJECT 
#define DUMP_READ_OBJECT

#if DUMP_BYTECODE 
js_dump_function_bytecode(ctx, b); 
#endif

make过后把里面数据dump下来

#include "quickjs-libc.h" 
#include <stdio.h> 
#include <stdlib.h> 
#include <string.h> 
uint8_t qjsc_s[] = {0x02, 0x3A, 0x10, 0x6C, 0x6F, 0x6E, 0x67, 0x32, 0x73, 0x74, 
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0x02, 0xAD, 0x16, 0x49, 0xCC, 0x93, 0x0A, 0xEC, 0xB9, 0xC5,0xB5, 0x47, 0xC3, 0x04, 0xC8, 0xBA, 0xA2, 0xC2, 0x04, 0xB7, 
0xA0, 0xAE, 0xC2, 0x04, 0xB8, 0xA2, 0xC8, 0xB9, 0xA0, 0xAE, 
0x9D, 0xC2, 0x09, 0xC2, 0x04, 0xAE, 0xC6, 0xC2, 0x0A, 0xB8, 
0xAD, 0xC2, 0x07, 0xAE, 0x47, 0xC8, 0xAE, 0x9D, 0xAE, 0xC3, 
0x06, 0xC5, 0xC7, 0x71, 0xC5, 0xC7, 0x47, 0xC2, 0x06, 0x9D, 
0xBF, 0x03, 0xAD, 0x16, 0x49, 0xCC, 0xED, 0x5F, 0xFF, 0x38, 
0xE4, 0x00, 0x00, 0x00, 0x38, 0xE1, 0x00, 0x00, 0x00, 0xC5, 
0x09, 0xF0, 0x23, 0x01, 0x00, 0xDE, 0x03, 0x23, 0x15, 0x03, 
0x1C, 0x08, 0x08, 0x30, 0x30, 0x1D, 0x44, 0x85, 0x3F, 0x35, 
0x21, 0x30, 0x2B, 0xBC, 0x58, 0x17, 0x1C, 0xBC, 0x4E, 0x13, 
0x06, 0x00, 0x00, 0x20, 0x37, 0xEF, 0xC6, 0xE3, 0x41, 0x06, 
0x00, 0x00, 0xE0, 0xFF, 0xFF, 0xFF, 0xEF, 0x41, 0x06, 0x00, 
0x00, 0xE0, 0xFF, 0xFF, 0xFF, 0xEF, 0x41, 0x06, 0x00, 0x00, 
0xE0, 0xFF, 0xFF, 0xFF, 0xEF, 0x41, 0x0E, 0x43, 0x06, 0x00, 
0xC8, 0x03, 0x01, 0x03, 0x01, 0x04, 0x00, 0x01, 0x32, 0x04, 
0xB0, 0x01, 0x00, 0x01, 0x00, 0x8E, 0x04, 0x00, 0x00, 0x00, 
0x90, 0x04, 0x00, 0x01, 0x00, 0xE8, 0x03, 0x00, 0x02, 0x00, 
0xC1, 0xC9, 0xC1, 0xCA, 0xB5, 0xCB, 0xD1, 0x42, 0xF9, 0x00, 
0x00, 0x00, 0xC7, 0x91, 0xCB, 0x24, 0x01, 0x00, 0x42, 0x37, 
0x00, 0x00, 0x00, 0xBD, 0x10, 0x24, 0x01, 0x00, 0xCE, 0xE9, 
0xB6, 0xA9, 0xEA, 0x06, 0xBF, 0x00, 0xC6, 0x9D, 0xCA, 0xC6, 
0x94, 0x00, 0xC7, 0xD1, 0xE9, 0xA3, 0xEB, 0xD7, 0xC5, 0x28, 
0xDE, 0x03, 0x3E, 0x08, 0x03, 0x0D, 0x0D, 0x0E, 0x76, 0x35, 
0x12, 0x21, 0x07, 0x02, 0x30, 0x0E, 0x43, 0x06, 0x00, 0xCA, 
0x03, 0x01, 0x03, 0x01, 0x06, 0x00, 0x00, 0x52, 0x04, 0xB0, 
0x01, 0x00, 0x01, 0x00, 0x8E, 0x04, 0x00, 0x00, 0x00, 0xE8, 
0x03, 0x00, 0x01, 0x00, 0xF8, 0x03, 0x00, 0x02, 0x00, 0xC1, 
0xC9, 0xB5, 0xCA, 0xC6, 0xD1, 0xE9, 0xA3, 0xEA, 0x47, 0x38, 
0x09, 0x01, 0x00, 0x00, 0xD1, 0x42, 0x0A, 0x01, 0x00, 0x00, 
0xC6, 0xB6, 0x24, 0x02, 0x00, 0xBD, 0x10, 0xF0, 0xB9, 0xA0, 
0x38, 0x09, 0x01, 0x00, 0x00, 0xD1, 0x42, 0x0A, 0x01, 0x00, 
0x00, 0xC6, 0x8F, 0xCE, 0xB6, 0x24, 0x02, 0x00, 0xBD, 0x10, 
0xF0, 0xAF, 0xCF, 0xBE, 0xFF, 0x00, 0xAD, 0xCB, 0xC5, 0x38, 
0x99, 0x00, 0x00, 0x00, 0x42, 0xF5, 0x00, 0x00, 0x00, 0xC7, 
0x24, 0x01, 0x00, 0x9D, 0xC9, 0x93, 0x01, 0xEC, 0xB5, 0xC5, 
0x28, 0xDE, 0x03, 0x4A, 0x09, 0x03, 0x0D, 0x0D, 0x21, 0xDA, 
0x21, 0x58, 0x0D, 0x0D, 0x0E, 0x43, 0x06, 0x00, 0xCC, 0x03, 
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x29, 0xDE, 
0x03, 0x56, 0x01, 0x03, 0x0E, 0x43, 0x06, 0x00, 0x00, 0x01, 
0x09, 0x01, 0x04, 0x00, 0x00, 0xE6, 0x01, 0x0A, 0xB0, 0x01, 
0x00, 0x01, 0x00, 0x8E, 0x04, 0x00, 0x00, 0x00, 0x90, 0x04, 
0x00, 0x01, 0x00, 0x96, 0x04, 0x00, 0x02, 0x00, 0x98, 0x04, 
0x00, 0x03, 0x00, 0x9A, 0x04, 0x00, 0x04, 0x00, 0x9C, 0x04, 
0x00, 0x05, 0x00, 0x9E, 0x04, 0x00, 0x06, 0x00, 0xA0, 0x04, 
0x00, 0x07, 0x00, 0xE8, 0x03, 0x00, 0x08, 0x00, 0xC1, 0xC9, 
0xC1, 0xCC, 0xC1, 0xC3, 0x07, 0xB5, 0xC3, 0x08, 0xD1, 0x42, 
0xF9, 0x00, 0x00, 0x00, 0xC2, 0x08, 0x91, 0xC3, 0x08, 0x24, 
0x01, 0x00, 0xCA, 0xD1, 0x42, 0xF9, 0x00, 0x00, 0x00, 0xC2, 
0x08, 0x91, 0xC3, 0x08, 0x24, 0x01, 0x00, 0xCB, 0xD1, 0x42, 
0xF9, 0x00, 0x00, 0x00, 0xC2, 0x08, 0x91, 0xC3, 0x08, 0x24, 
0x01, 0x00, 0xCC, 0xC6, 0xB7, 0xA1, 0xC3, 0x04, 0xC6, 0xB8, 
0xAD, 0xB9, 0xA0, 0xC7, 0xB9, 0xA1, 0xAF, 0xC3, 0x05, 0xC7, 
0xBD, 0x0F, 0xAD, 0xB7, 0xA0, 0xC8, 0xBB, 0xA1, 0xAF, 0xC3, 
0x06, 0xC8, 0xBD, 0x3F, 0xAD, 0xC3, 0x07, 0x38, 0x11, 0x01, 
0x00, 0x00, 0xC7, 0xEF, 0xEA, 0x09, 0xBD, 0x40, 0xC4, 0x07, 
0xC3, 0x06, 0xEC, 0x0E, 0x38, 0x11, 0x01, 0x00, 0x00, 0xC8, 
0xEF, 0xEA, 0x05, 0xBD, 0x40, 0xC3, 0x07, 0xC5, 0x38, 0xE6, 
0x00, 0x00, 0x00, 0x41, 0xEA, 0x00, 0x00, 0x00, 0x42, 0x12,0x01, 0x00, 0x00, 0xC2, 0x04, 0x24, 0x01, 0x00, 0x9D, 0x38, 
0xE6, 0x00, 0x00, 0x00, 0x41, 0xEA, 0x00, 0x00, 0x00, 0x42, 
0x12, 0x01, 0x00, 0x00, 0xC2, 0x05, 0x24, 0x01, 0x00, 0x9D, 
0x38, 0xE6, 0x00, 0x00, 0x00, 0x41, 0xEA, 0x00, 0x00, 0x00, 
0x42, 0x12, 0x01, 0x00, 0x00, 0xC2, 0x06, 0x24, 0x01, 0x00, 
0x9D, 0x38, 0xE6, 0x00, 0x00, 0x00, 0x41, 0xEA, 0x00, 0x00, 
0x00, 0x42, 0x12, 0x01, 0x00, 0x00, 0xC2, 0x07, 0x24, 0x01, 
0x00, 0x9D, 0xC9, 0xC1, 0xD0, 0xCF, 0xCA, 0xC1, 0xC4, 0x07, 
0xC4, 0x06, 0xC4, 0x05, 0xC3, 0x04, 0xC2, 0x08, 0xD1, 0xE9, 
0xA3, 0x6A, 0x2A, 0xFF, 0xFF, 0xFF, 0xC5, 0x28, 0xDE, 0x03, 
0x59, 0x18, 0x03, 0x0D, 0x0D, 0x12, 0x13, 0x4E, 0x4E, 0x4E, 
0x1C, 0x3A, 0x3F, 0x21, 0x30, 0x21, 0x3A, 0x18, 0x08, 0x6C, 
0x6C, 0x6C, 0x71, 0x17, 0x30, 0x35, 0x0E, 0x43, 0x06, 0x00, 
0xCE, 0x03, 0x01, 0x04, 0x01, 0x04, 0x00, 0x00, 0x84, 0x01, 
0x05, 0xD0, 0x03, 0x00, 0x01, 0x00, 0xB0, 0x01, 0x00, 0x00, 
0x00, 0xA6, 0x04, 0x00, 0x01, 0x00, 0xA8, 0x04, 0x00, 0x02, 
0x00, 0xAC, 0x01, 0x00, 0x03, 0x00, 0xD1, 0xE9, 0xB6, 0xA3, 
0xEA, 0x0D, 0x38, 0x15, 0x01, 0x00, 0x00, 0x04, 0xEE, 0x00, 
0x00, 0x00, 0xEF, 0x29, 0x38, 0x15, 0x01, 0x00, 0x00, 0x04, 
0x16, 0x01, 0x00, 0x00, 0xD1, 0xB5, 0x47, 0x9D, 0xEF, 0x0E, 
0xD1, 0xB5, 0x47, 0xC9, 0x38, 0xE6, 0x00, 0x00, 0x00, 0x42, 
0xEB, 0x00, 0x00, 0x00, 0xC5, 0x24, 0x01, 0x00, 0xCA, 0x04, 
0x17, 0x01, 0x00, 0x00, 0x11, 0x39, 0x18, 0x01, 0x00, 0x00, 
0x0E, 0x38, 0xE3, 0x00, 0x00, 0x00, 0xC6, 0x38, 0x18, 0x01, 
0x00, 0x00, 0xF0, 0xCF, 0xE9, 0xBD, 0x70, 0xAA, 0xEA, 0x0D, 
0x38, 0x15, 0x01, 0x00, 0x00, 0x04, 0xEE, 0x00, 0x00, 0x00, 
0xEF, 0x29, 0x04, 0x19, 0x01, 0x00, 0x00, 0xCC, 0xC7, 0xC8, 
0xA9, 0xEA, 0x0E, 0x38, 0x15, 0x01, 0x00, 0x00, 0x04, 0x1A, 
0x01, 0x00, 0x00, 0xEF, 0x0E, 0x29, 0x38, 0x15, 0x01, 0x00, 
0x00, 0x04, 0xEE, 0x00, 0x00, 0x00, 0xEF, 0x29, 0xDE, 0x03, 
0x76, 0x11, 0x03, 0x21, 0x3B, 0x08, 0x54, 0x17, 0x4F, 0x3F, 
0x40, 0x26, 0x3B, 0x09, 0x21, 0x1D, 0x3F, 0x09, 0x3C, 0x00, 
0x00, 0x00, 0xDD, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
0x00, 0x00, 0x00, 0x00}; 
int main(int argc, char **argv) { 
JSRuntime *rt; 
JSContext *ctx; 
rt = JS_NewRuntime(); 
ctx = JS_NewContextRaw(rt); 
JS_SetModuleLoaderFunc(rt, NULL, js_module_loader, NULL); 
JS_AddIntrinsicBaseObjects(ctx); 
JS_AddIntrinsicDate(ctx); 
JS_AddIntrinsicEval(ctx); 
JS_AddIntrinsicStringNormalize(ctx); 
JS_AddIntrinsicRegExp(ctx); 
JS_AddIntrinsicJSON(ctx); 
JS_AddIntrinsicProxy(ctx); 
JS_AddIntrinsicMapSet(ctx); 
JS_AddIntrinsicTypedArrays(ctx); 
JS_AddIntrinsicPromise(ctx); 
JS_AddIntrinsicBigInt(ctx); 
js_std_add_helpers(ctx, argc, argv); 
js_std_eval_binary(ctx, qjsc_s, sizeof(qjsc_s), 0); 
js_std_loop(ctx); 
JS_FreeContext(ctx);JS_FreeRuntime(rt); 
return 0; 
}

再照上文编译并运行程序，即可得到一段比较直观的输出
然后逐一分析还原文件
经过分析可以知道先进行了一个base64加密
然后进行了一个xxtea
base64我们可以在表上看到有编码表
在这里插入图片描述
当往下分析到

0x9e3779b9很明显就是xxtea解密
这时我们就可以
先用xxtea解密

#include <stdio.h>  
#include <stdint.h>  
#define DELTA 0x9e3779b9  
#define MX (((z>>5^y<<2) + (y>>3^z<<4)) ^ ((sum^y) + (key[(p&3)^e] ^ z)))  
  
void btea(uint32_t *v, int n, uint32_t const key[4])  
{  
    uint32_t y, z, sum;  
    unsigned p, rounds, e;  
    if (n > 1)            /* Coding Part */  
    {  
        rounds = 6 + 52/n;  
        sum = 0;  
        z = v[n-1];  
        do  
        {  
            sum += DELTA;  
            e = (sum >> 2) & 3;  
            for (p=0; p<n-1; p++)  
            {  
                y = v[p+1];  
                z = v[p] += MX;  
            }  
            y = v[0];  
            z = v[n-1] += MX;  
        }  
        while (--rounds);  
    }  
    else if (n < -1)      /* Decoding Part */  
    {  
        n = -n;  
        rounds = 6 + 52/n;  
        sum = rounds*DELTA;  
        y = v[0];  
        do  
        {  
            e = (sum >> 2) & 3;  
            for (p=n-1; p>0; p--)  
            {  
                z = v[p-1];  
                y = v[p] -= MX;  
            }  
            z = v[n-1];  
            y = v[0] -= MX;  
            sum -= DELTA;  
        }  
        while (--rounds);  
    }  
}  
  
  
int main()  
{  
    //uint32_t v[2]= {1,2};  
    //uint32_t const k[4]= {2,2,3,4};
    int8_t cipher[] = {5, 174,208,206,68, 31,128,181, 188, 54, 175,76,105, 133,9,252,108,195,201,113,70,53,61,
    229, 169, 92, 106,190, 160,127, 212, 167,7,9,50, 216, 106,195, 45,98, 134, 114, 165,145, 35,229,151,35, 49,219,
    93,255,231,5,115,98};
    const int8_t key[] ="no_thing_is_true";
    uint32_t *v = (uint32_t *)cipher;
    const uint32_t *k  =(const uint32_t *)key;
    int n= sizeof(cipher)/ sizeof(uint32_t);


    //n的绝对值表示v的长度，取正表示加密，取负表示解密  
    // v为要加密的数据是两个32位无符号整数  
    // k为加密解密密钥，为4个32位无符号整数，即密钥长度为128位  
    // printf("加密前原始数据：%u %un",v[0],v[1]);  
    // btea(v, n, k);  
    // printf("加密后的数据：%u %un",v[0],v[1]);  
    btea(v, -n, k);  
    // printf("解密后的数据：%u %un",v[0],v[1]);
    printf("%s",cipher);
    printf("n");
    return 0;  
}