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伪装成业务应用安装程序的潜在行为

编辑

伪装成业务应用安装程序的潜在行为

编辑

识别名称类似于合法业务应用程序但缺少原始开发者签名的可执行文件。攻击者可能会通过恶意广告、论坛帖子和教程等方式诱骗用户下载伪装成合法应用程序的恶意可执行文件，从而有效地获得初始访问权限。

规则类型: eql

规则索引:

logs-endpoint.events.process-*

严重性: 低

风险评分: 21

运行频率: 5分钟

搜索索引的时间范围: now-9m ( 日期数学格式, 另请参阅 额外回溯时间)

每次执行的最大警报数: 100

参考:

https://www.rapid7.com/blog/post/2023/08/31/fake-update-utilizes-new-idat-loader-to-execute-stealc-and-lumma-infostealers

标签:

域：端点
数据源：Elastic Defend
操作系统：Windows
用例：威胁检测
策略：防御规避
策略：初始访问
策略：执行

版本: 4

规则作者:

Elastic

规则许可: Elastic License v2

规则查询

编辑

process where host.os.type == "windows" and
  event.type == "start" and process.executable : "?:\\Users\\*\\Downloads\\*" and
  not process.code_signature.status : ("errorCode_endpoint*", "errorUntrustedRoot", "errorChaining") and
  (
    /* Slack */
    (process.name : "*slack*.exe" and not
      (process.code_signature.subject_name in (
        "Slack Technologies, Inc.",
        "Slack Technologies, LLC"
       ) and process.code_signature.trusted == true)
    ) or

    /* WebEx */
    (process.name : "*webex*.exe" and not
      (process.code_signature.subject_name in ("Cisco WebEx LLC", "Cisco Systems, Inc.") and process.code_signature.trusted == true)
    ) or

    /* Teams */
    (process.name : "teams*.exe" and not
      (process.code_signature.subject_name == "Microsoft Corporation" and process.code_signature.trusted == true)
    ) or

    /* Discord */
    (process.name : "*discord*.exe" and not
      (process.code_signature.subject_name == "Discord Inc." and process.code_signature.trusted == true)
    ) or

    /* WhatsApp */
    (process.name : "*whatsapp*.exe" and not
      (process.code_signature.subject_name in (
        "WhatsApp LLC",
        "WhatsApp, Inc",
        "24803D75-212C-471A-BC57-9EF86AB91435"
       ) and process.code_signature.trusted == true)
    ) or

    /* Zoom */
    (process.name : ("*zoom*installer*.exe", "*zoom*setup*.exe", "zoom.exe")  and not
      (process.code_signature.subject_name == "Zoom Video Communications, Inc." and process.code_signature.trusted == true)
    ) or

    /* Outlook */
    (process.name : "*outlook*.exe" and not
      (
        (process.code_signature.subject_name == "Microsoft Corporation" and process.code_signature.trusted == true) or
        (
          process.name: "MSOutlookHelp-PST-Viewer.exe" and process.code_signature.subject_name == "Aryson Technologies Pvt. Ltd" and
          process.code_signature.trusted == true
        )
      )
    ) or

    /* Thunderbird */
    (process.name : "*thunderbird*.exe" and not
      (process.code_signature.subject_name == "Mozilla Corporation" and process.code_signature.trusted == true)
    ) or

    /* Grammarly */
    (process.name : "*grammarly*.exe" and not
      (process.code_signature.subject_name == "Grammarly, Inc." and process.code_signature.trusted == true)
    ) or

    /* Dropbox */
    (process.name : "*dropbox*.exe" and not
      (process.code_signature.subject_name == "Dropbox, Inc" and process.code_signature.trusted == true)
    ) or

    /* Tableau */
    (process.name : "*tableau*.exe" and not
      (process.code_signature.subject_name == "Tableau Software LLC" and process.code_signature.trusted == true)
    ) or

    /* Google Drive */
    (process.name : "*googledrive*.exe" and not
      (process.code_signature.subject_name == "Google LLC" and process.code_signature.trusted == true)
    ) or

    /* MSOffice */
    (process.name : "*office*setup*.exe" and not
      (process.code_signature.subject_name == "Microsoft Corporation" and process.code_signature.trusted == true)
    ) or

    /* Okta */
    (process.name : "*okta*.exe" and not
      (process.code_signature.subject_name == "Okta, Inc." and process.code_signature.trusted == true)
    ) or

    /* OneDrive */
    (process.name : "*onedrive*.exe" and not
      (process.code_signature.subject_name == "Microsoft Corporation" and process.code_signature.trusted == true)
    ) or

    /* Chrome */
    (process.name : "*chrome*.exe" and not
      (process.code_signature.subject_name in ("Google LLC", "Google Inc") and process.code_signature.trusted == true)
    ) or

    /* Firefox */
    (process.name : "*firefox*.exe" and not
      (process.code_signature.subject_name == "Mozilla Corporation" and process.code_signature.trusted == true)
    ) or

    /* Edge */
    (process.name : ("*microsoftedge*.exe", "*msedge*.exe") and not
      (process.code_signature.subject_name == "Microsoft Corporation" and process.code_signature.trusted == true)
    ) or

    /* Brave */
    (process.name : "*brave*.exe" and not
      (process.code_signature.subject_name == "Brave Software, Inc." and process.code_signature.trusted == true)
    ) or

    /* GoogleCloud Related Tools */
    (process.name : "*GoogleCloud*.exe" and not
      (process.code_signature.subject_name == "Google LLC" and process.code_signature.trusted == true)
    ) or

    /* Github Related Tools */
    (process.name : "*github*.exe" and not
      (process.code_signature.subject_name == "GitHub, Inc." and process.code_signature.trusted == true)
    ) or

    /* Notion */
    (process.name : "*notion*.exe" and not
      (process.code_signature.subject_name == "Notion Labs, Inc." 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：无效的代码签名
- 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/
策略
- 名称：初始访问
- ID：TA0001
- 参考网址：https://attack.mitre.org/tactics/TA0001/
技术
- 名称：驱动式入侵
- ID：T1189
- 参考网址：https://attack.mitre.org/techniques/T1189/
策略
- 名称：执行
- ID：TA0002
- 参考网址：https://attack.mitre.org/tactics/TA0002/
技术
- 名称：用户执行
- ID：T1204
- 参考网址：https://attack.mitre.org/techniques/T1204/
子技术
- 名称：恶意文件
- ID：T1204.002
- 参考网址：https://attack.mitre.org/techniques/T1204/002/

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