哥斯拉Godzilla V4版本WebShell木马通信解密分析教程<\/h1>

一、概述<\/h2>

本教程详细讲解如何解密哥斯拉(Godzilla)WebShell V4版本的加密通信流量，包括请求和响应的解密过程。哥斯拉V4版本采用了多层加密技术：XOR异或加密 + GZIP压缩 + Base64编码 + URL编码。<\/p>

关键特征：<\/strong><\/p>

默认加密密钥：3c6e0b8a9c15224a<\/code><\/li>
加密流程：PHP序列化数据 → GZIP压缩 → XOR加密 → Base64编码 → URL编码<\/li>
解密流程：URL解码 → Base64解码 → XOR解密 → GZIP解压<\/li> <\/ul> 二、原始数据示例<\/h2> HTTP请求示例<\/h3> key=fL1tMGI4YTljMX78f8Wo%2FyhTV1ECWEn3M%2BF4ZGJ%2BL2Iz5Ep7TupOFkzm%2Bhr7%2BbAcKvtI%2BCsUKBS1fn9%2Fnwa3ZNEYTX8zalGLMAL5fx%2F9qXySfal9B9pnI%2FJrpKjeqP6o%2BK7yMmKqk8RSazUyMg%3D%3D <\/code><\/pre> HTTP响应示例<\/h3> 72a9c691ccdaab98fL1tMGI4YTljMuYdeRizHEwZsv9K8azoTHj4H\/p9TXpO4Cp6L5VT32Exb2o\/bX8zYzY=b4c4e1f6ddd2a488 <\/code><\/pre> 三、解密流程详解<\/h2> 1. 解密HTTP请求中的key参数<\/h3> 步骤1：URL解码<\/strong><\/p> from<\/span> urllib.parse import<\/span> unquote <\/span><\/span> <\/span><\/span>encoded_key =<\/span> "fL1tMGI4YTljMX78f8Wo<\/span>%2F<\/span>yhTV1ECWEn3M%2BF4ZGJ%2BL2Iz5Ep7TupOFkzm%2Bhr7%2BbAcKvtI%2BCsUKBS1fn9<\/span>%2F<\/span>nwa3ZNEYTX8zalGLMAL5fx<\/span>%2F<\/span>9qXySfal9B9pnI<\/span>%2F<\/span>JrpKjeqP6o%2BK7yMmKqk8RSazUyMg%3D%3D"<\/span> <\/span><\/span>decoded_key =<\/span> unquote(encoded_key) <\/span><\/span># 结果: fL1tMGI4YTljMX78f8Wo\/yhTV1ECWEn3M+F4ZGJ+L2Iz5Ep7TupOFkzm+hr7+bAcKvtI+CsUKBS1fn9\/nwa3ZNEYTX8zalGLMAL5fx\/9qXySfal9B9pnI\/JrpKjeqP6o+K7yMmKqk8RSazUyMg==<\/span> <\/span><\/span><\/code><\/pre>步骤2：Base64解码<\/strong><\/p> import<\/span> base64 <\/span><\/span> <\/span><\/span>decoded_bytes =<\/span> base64.<\/span>b64decode(decoded_key) <\/span><\/span><\/code><\/pre>步骤3：XOR解密<\/strong><\/p> def<\/span> xor_decrypt<\/span>(data, key): <\/span><\/span> key_bytes =<\/span> key.<\/span>encode('utf-8'<\/span>) <\/span><\/span> decrypted =<\/span> bytearray() <\/span><\/span> for<\/span> i in<\/span> range(len(data)): <\/span><\/span> decrypted.<\/span>append(data[i] ^<\/span> key_bytes[i %<\/span> len(key_bytes)]) <\/span><\/span> return<\/span> bytes(decrypted) <\/span><\/span> <\/span><\/span>key =<\/span> "3c6e0b8a9c15224a"<\/span> # 哥斯拉V4默认密钥<\/span> <\/span><\/span>xor_decrypted =<\/span> xor_decrypt(decoded_bytes, key) <\/span><\/span><\/code><\/pre>步骤4：GZIP解压<\/strong><\/p> import<\/span> gzip <\/span><\/span> <\/span><\/span>try<\/span>: <\/span><\/span> uncompressed =<\/span> gzip.<\/span>decompress(xor_decrypted) <\/span><\/span> command =<\/span> uncompressed.<\/span>decode('utf-8'<\/span>) <\/span><\/span> print("解密后的命令:"<\/span>, command) <\/span><\/span>except<\/span> Exception<\/span> as<\/span> e: <\/span><\/span> print("解压失败:"<\/span>, e) <\/span><\/span><\/code><\/pre>2. 解密HTTP响应体<\/h3> 响应体结构分析：<\/p> 72a9c691ccdaab98 [XOR加密的GZIP数据] b4c4e1f6ddd2a488 <\/code><\/pre> 前16字节和后16字节是随机填充数据<\/li> 中间部分是真正的加密数据<\/li> <\/ul> 解密步骤：<\/strong><\/p> response =<\/span> "72a9c691ccdaab98fL1tMGI4YTljMuYdeRizHEwZsv9K8azoTHj4H\/p9TXpO4Cp6L5VT32Exb2o\/bX8zYzY=b4c4e1f6ddd2a488"<\/span> <\/span><\/span> <\/span><\/span># 1. 提取中间加密部分<\/span> <\/span><\/span>encrypted_part =<\/span> response[16<\/span>:-<\/span>16<\/span>] # "fL1tMGI4YTljMuYdeRizHEwZsv9K8azoTHj4H\/p9TXpO4Cp6L5VT32Exb2o\/bX8zYzY="<\/span> <\/span><\/span> <\/span><\/span># 2. Base64解码<\/span> <\/span><\/span>decoded_response =<\/span> base64.<\/span>b64decode(encrypted_part) <\/span><\/span> <\/span><\/span># 3. XOR解密<\/span> <\/span><\/span>xor_decrypted_response =<\/span> xor_decrypt(decoded_response, key) <\/span><\/span> <\/span><\/span># 4. GZIP解压<\/span> <\/span><\/span>try<\/span>: <\/span><\/span> uncompressed_response =<\/span> gzip.<\/span>decompress(xor_decrypted_response) <\/span><\/span> response_data =<\/span> uncompressed_response.<\/span>decode('utf-8'<\/span>) <\/span><\/span> print("解密后的响应:"<\/span>, response_data) <\/span><\/span>except<\/span> Exception<\/span> as<\/span> e: <\/span><\/span> print("响应解压失败:"<\/span>, e) <\/span><\/span><\/code><\/pre>四、常见问题与解决方案<\/h2> 问题1：解密后出现乱码<\/h3> 现象：<\/strong> 类似KMKe2a``(PMVPJNQP\/K,\/\/\/(\/I-I,I-OJM2W.(OQR0S3M-OKMeZ윟윟1Z<\/code>的乱码<\/p> 原因：<\/strong><\/p> 缺少GZIP解压步骤<\/li> 检查十六进制开头是否为1f8b08<\/code>(GZIP魔数)<\/li> <\/ol> 解决方案：<\/strong> 确保解密流程完整：Base64 → XOR → GZIP<\/p> 问题2：响应解密失败<\/h3> 原因：<\/strong><\/p> 未正确处理响应体结构(前后16字节的随机数据)<\/li> 密钥不正确<\/li> <\/ol> 解决方案：<\/strong><\/p> 确保只解密中间部分数据<\/li> 验证密钥是否正确(默认3c6e0b8a9c15224a<\/code>)<\/li> <\/ol> 问题3：GZIP解压失败<\/h3> 原因：<\/strong><\/p> XOR解密不完整导致数据损坏<\/li> 数据被截断<\/li> <\/ol> 解决方案：<\/strong><\/p> 检查XOR解密步骤是否正确<\/li> 验证Base64解码是否完整<\/li> <\/ol> 五、完整Python解密脚本<\/h2> import<\/span> base64 <\/span><\/span>import<\/span> gzip <\/span><\/span>from<\/span> urllib.parse import<\/span> unquote <\/span><\/span> <\/span><\/span>def<\/span> xor_decrypt<\/span>(data, key): <\/span><\/span> key_bytes =<\/span> key.<\/span>encode('utf-8'<\/span>) <\/span><\/span> decrypted =<\/span> bytearray() <\/span><\/span> for<\/span> i in<\/span> range(len(data)): <\/span><\/span> decrypted.<\/span>append(data[i] ^<\/span> key_bytes[i %<\/span> len(key_bytes)]) <\/span><\/span> return<\/span> bytes(decrypted) <\/span><\/span> <\/span><\/span>def<\/span> decrypt_godzilla_v4<\/span>(encrypted_data, is_response=<\/span>False<\/span>): <\/span><\/span> # 哥斯拉V4默认密钥<\/span> <\/span><\/span> key =<\/span> "3c6e0b8a9c15224a"<\/span> <\/span><\/span> <\/span><\/span> try<\/span>: <\/span><\/span> # 如果是响应数据，需要去掉前后16字节的随机数据<\/span> <\/span><\/span> if<\/span> is_response: <\/span><\/span> encrypted_data =<\/span> encrypted_data[16<\/span>:-<\/span>16<\/span>] <\/span><\/span> <\/span><\/span> # Base64解码<\/span> <\/span><\/span> decoded =<\/span> base64.<\/span>b64decode(encrypted_data) <\/span><\/span> <\/span><\/span> # XOR解密<\/span> <\/span><\/span> xor_decrypted =<\/span> xor_decrypt(decoded, key) <\/span><\/span> <\/span><\/span> # GZIP解压<\/span> <\/span><\/span> uncompressed =<\/span> gzip.<\/span>decompress(xor_decrypted) <\/span><\/span> <\/span><\/span> # 返回解密后的明文<\/span> <\/span><\/span> return<\/span> uncompressed.<\/span>decode('utf-8'<\/span>) <\/span><\/span> except<\/span> Exception<\/span> as<\/span> e: <\/span><\/span> return<\/span> f<\/span>"解密失败: <\/span>{<\/span>str(e)}<\/span>"<\/span> <\/span><\/span> <\/span><\/span># 解密请求示例<\/span> <\/span><\/span>encoded_key =<\/span> "fL1tMGI4YTljMX78f8Wo<\/span>%2F<\/span>yhTV1ECWEn3M%2BF4ZGJ%2BL2Iz5Ep7TupOFkzm%2Bhr7%2BbAcKvtI%2BCsUKBS1fn9<\/span>%2F<\/span>nwa3ZNEYTX8zalGLMAL5fx<\/span>%2F<\/span>9qXySfal9B9pnI<\/span>%2F<\/span>JrpKjeqP6o%2BK7yMmKqk8RSazUyMg%3D%3D"<\/span> <\/span><\/span>decoded_key =<\/span> unquote(encoded_key) <\/span><\/span>decrypted_command =<\/span> decrypt_godzilla_v4(decoded_key) <\/span><\/span>print("解密后的命令:"<\/span>, decrypted_command) <\/span><\/span> <\/span><\/span># 解密响应示例<\/span> <\/span><\/span>response =<\/span> "72a9c691ccdaab98fL1tMGI4YTljMuYdeRizHEwZsv9K8azoTHj4H\/p9TXpO4Cp6L5VT32Exb2o\/bX8zYzY=b4c4e1f6ddd2a488"<\/span> <\/span><\/span>decrypted_response =<\/span> decrypt_godzilla_v4(response, is_response=<\/span>True<\/span>) <\/span><\/span>print("解密后的响应:"<\/span>, decrypted_response) <\/span><\/span><\/code><\/pre>六、技术要点总结<\/h2> 加密流程<\/strong>：哥斯拉V4采用多层加密，理解每层的顺序是关键<\/li> 密钥使用<\/strong>：XOR加密使用固定密钥，循环使用密钥字节进行异或<\/li> 数据识别<\/strong>： GZIP压缩数据以1f8b08<\/code>开头<\/li> 响应体包含前后16字节的随机数据<\/li> <\/ul> <\/li> 错误处理<\/strong>：解密失败时逐步检查每步结果，特别是Base64和GZIP步骤<\/li> <\/ol> 通过本教程，您应该能够完整解密哥斯拉V4 WebShell的通信流量，分析攻击者执行的命令和服务器返回的信息。<\/p>