行为检测通过hook关键api，以及对各个高危的文件、组件做监控防止恶意程序对系统修改。只要恶意程序对注册表、启动项、系统文件等做操作就会触发告警。最后，行为检测也被应用到了沙箱做为动态检测，对于避免沙箱检测的办法有如下几个：
花指令其实就是一段毫无意义的指令，也可以称之为垃圾指令。花指令是否存在对程序的执行结果没有影响，所以它存在的唯一目的就是阻止反汇编程序，或对反汇编设置障碍。
免杀就是反病毒技术，，它指的是一种能使病毒木马免于被杀毒软件查杀的技术。由于免杀技术的涉猎面非常广，其中包含反汇编、逆向工程、系统漏洞等黑客技术，所以难度很高，一般人不会或没能力接触这技术的深层内容。其内容基本上都是修改病毒、木马的内容改变特征码，从而躲避了杀毒软件的查杀。
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所以加冷门壳，壳特征未被分析，不能自动脱壳，可以更好隐藏原始代码，得到免杀效果。
ZwQuerySystemInformation81 endp NtAllocateVirtualMemory81 proc mov r10, rcx mov eax, 17h syscall ret
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病毒查杀默认开启。随时全盘扫描设备，轻松查杀隐藏病毒，净化使用环境。
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经过测试，发现使用的编码类型越多，免杀率可能会降低，猜测是因为各种编码引入了更多的特征码。同时生成的payload也很可能无法正常执行，这个也和被捆绑程序有一定关联。
这些工具有的免杀效果也算一般，但可能只是因为发布时间长了一些，生成�?payload 都被杀软都加入了特征库，有几款工具都是�?blackhat 大会上发布的，甚至在免杀史上具有一些里程碑意义，但目前来看免杀效果也比较一般了。我们主要是学习他们的免杀原理和技巧，进而能打造自己的免杀秘术。
云查杀用一句话概括就是——“可信继承，群策群力”，也正因此，云查杀以及其跟随衍生出来的技术也是最具有挑战性的。
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