可疑的 Windows Powershell 参数

编辑

识别具有可疑参数值的 PowerShell 执行。这种行为通常在利用 PowerShell 的恶意软件安装期间观察到。

规则类型: eql

规则索引:

  • winlogbeat-*
  • logs-windows.*
  • logs-system.security*
  • logs-windows.sysmon_operational-*
  • logs-sentinel_one_cloud_funnel.*
  • logs-m365_defender.event-*
  • logs-crowdstrike.fdr*

严重性: 高

风险评分: 73

运行频率: 5 分钟

搜索索引起始时间: now-9m (日期数学格式,另请参阅额外的回溯时间)

每次执行的最大告警数: 100

参考: 无

标签:

  • 域: 端点
  • 操作系统: Windows
  • 用例: 威胁检测
  • 战术: 执行
  • 数据源: 系统
  • 数据源: Sysmon
  • 数据源: SentinelOne
  • 数据源: Microsoft Defender for Endpoint
  • 数据源: Crowdstrike

版本: 202

规则作者:

  • Elastic

规则许可证: Elastic License v2

规则查询

编辑
process where host.os.type == "windows" and event.type == "start" and
 process.name : "powershell.exe" and
  (
   process.command_line :
        (
          "*^*^*^*^*^*^*^*^*^*",
          "*`*`*`*`*",
          "*+*+*+*+*+*+*",
          "*[char[]](*)*-join*",
          "*Base64String*",
          "*[*Convert]*",
          "*.Compression.*",
          "*-join($*",
          "*.replace*",
          "*MemoryStream*",
          "*WriteAllBytes*",
          "* -enc *",
          "* -ec *",
          "* /e *",
          "* /enc *",
          "* /ec *",
          "*WebClient*",
          "*DownloadFile*",
          "*DownloadString*",
          "* iex*",
          "* iwr*",
          "*Reflection.Assembly*",
          "*Assembly.GetType*",
          "*$env:temp\\*start*",
          "*powercat*",
          "*nslookup -q=txt*",
          "*$host.UI.PromptForCredential*",
          "*Net.Sockets.TCPClient*",
          "*curl *;Start*",
          "powershell.exe \"<#*",
          "*ssh -p *",
          "*http*|iex*",
          "*@SSL\\DavWWWRoot\\*.ps1*",
          "*.lnk*.Seek(0x*",
          "*[string]::join(*",
          "*[Array]::Reverse($*",
          "* hidden $(gc *",
          "*=wscri& set*",
          "*http'+'s://*",
          "*.content|i''Ex*",
          "*//:sptth*",
          "*//:ptth*",
          "*$*=Get-Content*AppData*.SubString(*$*",
          "*=cat *AppData*.substring(*);*$*"
        ) or

      (process.args : "-c" and process.args : "&{'*") or

      (process.args : "-Outfile" and process.args : "Start*") or

      (process.args : "-bxor" and process.args : "0x*") or

      process.args : "$*$*;set-alias" or

      (process.parent.name : ("explorer.exe", "cmd.exe") and
       process.command_line : ("*-encodedCommand*", "*Invoke-webrequest*", "*WebClient*", "*Reflection.Assembly*"))
  )

框架: MITRE ATT&CKTM