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WMI Defense

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10月 25, 2022

0x00 前言
前两篇分别介绍了WMI Attacks & WMI Backdoor,侧重于攻击,所以这篇介绍一下WMI Defense,攻防结合,便于大家更清楚认识WMI.

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0x01 简介
本篇侧重于介绍如何通过Powershell调用WMI监视自身系统、记录入侵行为,并对WMI的检测工具做具体测试。

0x02 测试环境
Win8 x86 powershell v3(win8默认安装) 开启Winmgmt服务,支持WMI

0x03 监视系统
*注: 以下均为Powershell代码

1、监视进程创建
$filterName = ‘BotFilter48’
$consumerName = ‘BotConsumer48’

#查询进程创建事件

$Query = “SELECT * FROM __InstanceCreationEvent WITHIN 5 WHERE TargetInstance ISA ‘Win32_Process'”

$WMIEventFilter = Set-WmiInstance -Class __EventFilter -NameSpace “root\subscription” -Arguments @{Name=$filterName;EventNameSpace=”root\cimv2″;QueryLanguage=”WQL”;Query=$Query} -ErrorAction Stop

#写入日志文件

$Arg =@{
Name=$consumerName
Filename = ‘C:\test\log.log’
Text = ‘New Process Created with name %TargetInstance.Name%’
}

$WMIEventConsumer = Set-WmiInstance -Class LogFileEventConsumer -Namespace “root\subscription” -Arguments $Arg

Set-WmiInstance -Class __FilterToConsumerBinding -Namespace “root\subscription” -Arguments @{Filter=$WMIEventFilter;Consumer=$WMIEventConsumer}
如图

enter image description here

enter image description here

2、监视进程结束
$filterName = ‘BotFilter49’
$consumerName = ‘BotConsumer49’

# 查询进程结束事件

$Query = “SELECT * FROM __InstanceDeletionEvent WITHIN 5 WHERE TargetInstance ISA ‘Win32_Process'”
$WMIEventFilter = Set-WmiInstance -Class __EventFilter -NameSpace “root\subscription” -Arguments @{Name=$filterName;EventNameSpace=”root\cimv2″;QueryLanguage=”WQL”;Query=$Query} -ErrorAction Stop

$Arg =@{
Name=$consumerName
Filename = ‘C:\test\log.log’
Text = ‘Task kill with name %TargetInstance.Name%’
}
$WMIEventConsumer = Set-WmiInstance -Class LogFileEventConsumer -Namespace “root\subscription” -Arguments $Arg

Set-WmiInstance -Class __FilterToConsumerBinding -Namespace “root\subscription” -Arguments @{Filter=$WMIEventFilter;Consumer=$WMIEventConsumer}
如图

enter image description here

3、监视注册表
(1)监视单一键值

$filterName = ‘BotFilter51’
$consumerName = ‘BotConsumer51′

$Query =”SELECT * FROM RegistryKeyChangeEvent WHERE Hive=’HKEY_LOCAL_MACHINE’ AND KeyPath=’SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run'”

$WMIEventFilter = Set-WmiInstance -Class __EventFilter -NameSpace “root\subscription” -Arguments @{Name=$filterName;EventNameSpace=”root\default”;QueryLanguage=”WQL”;Query=$Query} -ErrorAction Stop

$Arg =@{
Name=$consumerName
Filename = ‘C:\test\log.log’
Text =’The change is HKEY_LOCAL_MACHINE\\%KeyPath%’
}

$WMIEventConsumer = Set-WmiInstance -Class LogFileEventConsumer -Namespace “root\subscription” -Arguments $Arg

Set-WmiInstance -Class __FilterToConsumerBinding -Namespace “root\subscription” -Arguments @{Filter=$WMIEventFilter;Consumer=$WMIEventConsumer}
监视 “HKEY_LOCAL_MACHINE\\SOFTWARE\Microsoft\Windows\CurrentVersion\Run” 键值的任何改动

如图

enter image description here

(2)监视某一键值及其子键

监视 “HKEY_LOCAL_MACHINE\\SOFTWARE\Microsoft” 键值及其子键的任何改动

$filterName = ‘BotFilter52’
$consumerName = ‘BotConsumer52′

$Query =”SELECT * FROM RegistryTreeChangeEvent WHERE Hive=’HKEY_LOCAL_MACHINE’ AND RootPath=’SOFTWARE\\Microsoft\\'”

$WMIEventFilter = Set-WmiInstance -Class __EventFilter -NameSpace “root\subscription” -Arguments @{Name=
$filterName;EventNameSpace=”root\default”;QueryLanguage=”WQL”;Query=$Query} -ErrorAction Stop

$Arg =@{
Name=$consumerName
Filename = ‘C:\test\logtree.log’
Text =’The change is HKEY_LOCAL_MACHINE\\%RootPath%’
}

$WMIEventConsumer = Set-WmiInstance -Class LogFileEventConsumer -Namespace “root\subscription” -Arguments $Arg
Set-WmiInstance -Class __FilterToConsumerBinding -Namespace “root\subscription” -Arguments @{Filter=

$WMIEventFilter;Consumer=$WMIEventConsumer}
0x04 检测工具测试
测试工具:

Sysinternals Autoruns
检测目标:

能否查出所有WMI定时运行的操作

测试方法:

在目标主机运行包含以下Consumer的定时运行操作,使用Sysinternals Autoruns进行检测。

-ActiveScriptEventConsumer
-CommandLineEventConsumer
-LogFileEventConsumer
-NTEventLogEventConsumer
-ScriptingStandardConsumerSetting
-SMTPEventConsumer
测试结果:

如图

enter image description here

Sysinternals Autoruns只能检测到ActiveScriptEventConsumer和CommandLineEventConsumer的操作,可以理解为上述对进程和注册表监视的操作无法识别

解决措施:

直接查询WMI调用,即可获得所有定时执行的操作

#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
0x05 WMI使用补充
以上三篇关于WMI的文章均采用Powershell实现,当然用mof和vbs也能够实现,这里给出一些参考代码,其他功能代码按照格式修改即可

1、mof文件记录注册表修改的操作
(1)以下文件保存为reg.mof文件

#pragma namespace (“\\\\.\\root\\subscription”)
instance of __EventFilter as $Filter
{
Name = “RunKeyFilter”;
QueryLanguage = “WQL”;
Query = “Select * from RegistryTreeChangeEvent”
” where (Hive = \”HKEY_LOCAL_MACHINE\” and ”
“KeyPath = \”Software\\\\Microsoft\\\\Windows”
“\\\\CurrentVersion\\\\Run\”)”;

// RegistryTreeChangeEvents only fire
// in root\default namespace
EventNamespace = “root\\default”;
};

instance of LogFileEventConsumer as $Consumer
{
Name= “consumer1”;
Filename = “C:\test\log.log”;
Text =”The change is HKEY_LOCAL_MACHINE\\%KeyPath%”;

};
// Bind the filter to the consumer
instance of __FilterToConsumerBinding
{
Filter = $Filter;
Consumer = $Consumer;
};
(2)编译mof文件

命令行下管理员权限执行mofcomp reg.mof

2、vbs文件记录注册表修改的操作
strComputer = “.”
Set objWMIService = GetObject(“winmgmts:\\” & strComputer & “\root\default”)
Set colEvents = objWMIService.ExecNotificationQuery _
(“SELECT * FROM RegistryKeyChangeEvent WHERE Hive=’HKEY_LOCAL_MACHINE’ AND ” & _
“KeyPath=’SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Run'”)
Do
Set objLatestEvent = colEvents.NextEvent
Wscript.Echo Now & “: The registry has been modified.”
Loop
0x06 小结
以上三篇对WMI Attacks、WMI Backdoor、WMI Defense做了全面介绍,时间有限细节之处难免会有疏忽,欢迎大家共同交流,共同学习,我会在留言作适当补充更正:)

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