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可疑通信应用子进程

编辑

可疑通信应用子进程编辑

识别通信应用的可疑子进程，这可能表明潜在的通信应用伪装或应用程序上的漏洞利用导致其执行代码。

规则类型: eql

规则索引:

logs-endpoint.events.process-*

严重性: 低

风险评分: 21

每隔: 5m 运行一次

从以下时间开始搜索索引: now-9m（日期数学格式，另请参见 额外回溯时间）

每次执行的最大警报数: 100

参考: 无

标签:

域：端点
操作系统：Windows
用例：威胁检测
策略：防御规避
策略：持久性
规则类型：BBR
数据源：Elastic Defend

版本: 5

规则作者:

Elastic

规则许可证: Elastic 许可证 v2

规则查询编辑

process where host.os.type == "windows" and event.type == "start" and
  (
    /* Slack */
    (process.parent.name : "slack.exe" and not
      (
        (
          process.executable : (
            "?:\\Program Files\\*",
            "?:\\Program Files (x86)\\*",
            "?:\\Users\\*\\AppData\\Local\\Google\\Chrome\\Application\\chrome.exe",
            "?:\\Users\\*\\AppData\\Local\\Island\\Island\\Application\\Island.exe",
            "?:\\Users\\*\\AppData\\Roaming\\Zoom\\bin*\\Zoom.exe",
            "?:\\Windows\\System32\\rundll32.exe",
            "?:\\Users\\*\\AppData\\Local\\Mozilla Firefox\\firefox.exe",
            "?:\\Windows\\System32\\notepad.exe",
            "?:\\Windows\\System32\\WerFault.exe",
            "?:\\Windows\\SysWOW64\\WerFault.exe",
            "?:\\Users\\*\\AppData\\Local\\Programs\\Opera\\opera.exe"
          ) and process.code_signature.trusted == true
        ) or
        (
          process.code_signature.subject_name : (
            "Slack Technologies, Inc.",
            "Slack Technologies, LLC"
          ) and process.code_signature.trusted == true
        ) or
        (
          (process.name : "powershell.exe" and process.command_line : "powershell.exe -c Invoke-WebRequest -Uri https://slackb.com/*") or
          (process.name : "cmd.exe" and process.command_line : "C:\\WINDOWS\\system32\\cmd.exe /d /s /c \"%windir%\\System32\\rundll32.exe User32.dll,SetFocus 0\"")
        )
      )
    ) or

    /* WebEx */
    (process.parent.name : ("CiscoCollabHost.exe", "WebexHost.exe") and not
      (
        (
          process.executable : (
            "?:\\Program Files\\*",
            "?:\\Program Files (x86)\\*",
            "?:\\Windows\\System32\\WerFault.exe",
            "?:\\Users\\*\\AppData\\Local\\Google\\Chrome\\Application\\chrome.exe",
            "?:\\Users\\*\\AppData\\Local\\Mozilla Firefox\\firefox.exe",
            "?:\\Users\\*\\AppData\\Local\\Programs\\Opera\\opera.exe"
          ) and process.code_signature.trusted == true
        ) or
        (
          process.code_signature.subject_name : (
            "Cisco Systems, Inc.",
            "Cisco WebEx LLC",
            "Cisco Systems Inc."
          ) and process.code_signature.trusted == true
        )
      )
    ) or

    /* Teams */
    (process.parent.name : "Teams.exe" and not
      (
        (
          process.executable : (
            "?:\\Program Files\\*",
            "?:\\Program Files (x86)\\*",
            "?:\\Windows\\System32\\WerFault.exe",
            "?:\\Windows\\SysWOW64\\WerFault.exe",
            "?:\\Windows\\BrowserCore\\BrowserCore.exe",
            "?:\\Users\\*\\AppData\\Local\\Google\\Chrome\\Application\\chrome.exe",
            "?:\\Users\\*\\AppData\\Local\\Mozilla Firefox\\firefox.exe"
          ) and process.code_signature.trusted == true
        ) or
        (
          process.code_signature.subject_name : (
            "Microsoft Corporation",
            "Microsoft 3rd Party Application Component"
          ) and process.code_signature.trusted == true
        ) or
        (
          (process.name : "taskkill.exe" and process.args : "Teams.exe")
        )
      )
    ) or

    /* Discord */
    (process.parent.name : "Discord.exe" and not
      (
        (
          process.executable : (
            "?:\\Program Files\\*",
            "?:\\Program Files (x86)\\*",
            "?:\\Users\\*\\AppData\\Local\\Google\\Chrome\\Application\\chrome.exe",
            "?:\\Windows\\System32\\reg.exe",
            "?:\\Windows\\SysWOW64\\reg.exe",
            "?:\\Windows\\System32\\WerFault.exe",
            "?:\\Windows\\SysWOW64\\WerFault.exe"
          ) and process.code_signature.trusted == true
        ) or
        (
          process.code_signature.subject_name : (
            "Discord Inc."
          ) and process.code_signature.trusted == true
        ) or
        (
          process.name : "cmd.exe" and
          (
            process.command_line : (
              "C:\\WINDOWS\\system32\\cmd.exe /d /s /c \"chcp\"",
              "C:\\WINDOWS\\system32\\cmd.exe /q /d /s /c \"C:\\Program^ Files\\NVIDIA^ Corporation\\NVSMI\\nvidia-smi.exe\""
            ) or
            process.args : (
              "C:\\WINDOWS/System32/nvidia-smi.exe",
              "C:\\WINDOWS\\System32\\nvidia-smi.exe",
              "C:\\Windows\\System32\\DriverStore\\FileRepository/*/nvidia-smi.exe*"
            )
          )
        )
      )
    ) or

    /* WhatsApp */
    (process.parent.name : "Whatsapp.exe" and not
      (
        (
          process.executable : (
            "?:\\Program Files\\*",
            "?:\\Program Files (x86)\\*",
            "?:\\Windows\\System32\\WerFault.exe",
            "?:\\Windows\\System32\\reg.exe",
            "?:\\Windows\\SysWOW64\\reg.exe"
          ) and process.code_signature.trusted == true
        ) or
        (
          process.code_signature.subject_name : (
            "WhatsApp LLC",
            "WhatsApp, Inc",
            "24803D75-212C-471A-BC57-9EF86AB91435"
          ) and process.code_signature.trusted == true
        ) or
        (
          (process.name : "cmd.exe" and process.command_line : "C:\\Windows\\system32\\cmd.exe /d /s /c \"C:\\Windows\\system32\\wbem\\wmic.exe*")
        )
      )
    ) or

    /* Zoom */
    (process.parent.name : "Zoom.exe" and not
      (
        (
          process.executable : (
            "?:\\Program Files\\*",
            "?:\\Program Files (x86)\\*",
            "?:\\Users\\*\\AppData\\Local\\Google\\Chrome\\Application\\chrome.exe",
            "?:\\Users\\*\\AppData\\Local\\Island\\Island\\Application\\Island.exe",
            "?:\\Users\\*\\AppData\\Local\\Mozilla Firefox\\firefox.exe",
            "?:\\Windows\\System32\\WerFault.exe"
          ) and process.code_signature.trusted == true
        ) or
        (
          process.code_signature.subject_name : (
            "Zoom Video Communications, Inc."
          ) and process.code_signature.trusted == true
        )
      )
    ) or

    /* Outlook */
    (process.parent.name : "outlook.exe" and not
      (
        (
          process.executable : (
            "?:\\Program Files\\*",
            "?:\\Program Files (x86)\\*",
            "?:\\Windows\\System32\\WerFault.exe",
            "?:\\Windows\\SysWOW64\\WerFault.exe",
            "?:\\Windows\\system32\\wermgr.exe",
            "?:\\Users\\*\\AppData\\Local\\Microsoft\\Teams\\current\\Teams.exe",
            "?:\\Users\\*\\AppData\\Local\\Temp\\NewOutlookInstall\\NewOutlookInstaller.exe",
            "?:\\Users\\*\\AppData\\Local\\Google\\Chrome\\Application\\chrome.exe",
            "?:\\Users\\*\\AppData\\Local\\Island\\Island\\Application\\Island.exe",
            "?:\\Users\\*\\AppData\\Local\\Mozilla Firefox\\firefox.exe",
            "?:\\Users\\*\\AppData\\Roaming\\Zoom\\bin\\Zoom.exe",
            "?:\\Windows\\System32\\IME\\SHARED\\IMEWDBLD.EXE",
            "?:\\Windows\\System32\\spool\\drivers\\x64\\*",
            "?:\\Windows\\System32\\prevhost.exe",
            "?:\\Windows\\System32\\dwwin.exe",
            "?:\\Windows\\System32\\mspaint.exe",
            "?:\\Windows\\SysWOW64\\mspaint.exe",
            "?:\\Windows\\System32\\notepad.exe",
            "?:\\Windows\\SysWOW64\\notepad.exe",
            "?:\\Windows\\System32\\smartscreen.exe",
            "?:\\Windows\\explorer.exe",
            "?:\\Windows\\splwow64.exe"
          ) and process.code_signature.trusted == true
        ) or
        (
          process.name : "rundll32.exe" and
          process.args : "*hpmsn???.dll,MonitorPrintJobStatus*"
        )
      )
    ) or

    /* Thunderbird */
    (process.parent.name : "thunderbird.exe" and not
      (
        (
          process.executable : (
            "?:\\Program Files\\*",
            "?:\\Program Files (x86)\\*",
            "?:\\Windows\\System32\\WerFault.exe",
            "?:\\Windows\\splwow64.exe"
          ) and process.code_signature.trusted == true
        ) or
        (
          process.code_signature.subject_name : (
            "Mozilla Corporation"
          ) and process.code_signature.trusted == true
        )
      )
    )
  )

框架：MITRE ATT&CK^TM

策略
- 名称：防御规避
- ID：TA0005
- 参考网址：https://attack.mitre.org/tactics/TA0005/
技术
- 名称：伪装
- ID：T1036
- 参考网址：https://attack.mitre.org/techniques/T1036/
子技术
- 名称：无效代码签名
- ID：T1036.001
- 参考网址：https://attack.mitre.org/techniques/T1036/001/
子技术
- 名称：匹配合法名称或位置
- ID：T1036.005
- 参考网址：https://attack.mitre.org/techniques/T1036/005/
技术
- 名称：进程注入
- ID：T1055
- 参考网址：https://attack.mitre.org/techniques/T1055/
策略
- 名称：持久性
- ID：TA0003
- 参考网址：https://attack.mitre.org/tactics/TA0003/
技术
- 名称：破坏主机软件二进制文件
- ID：T1554
- 参考网址：https://attack.mitre.org/techniques/T1554/

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