受感染的端点
未经授权的浏览器
当用户尝试从组织 IT 策略不允许的浏览器类型或版本访问内容，或因安全漏洞而访问时，会发生此情况。
详细信息
数据源：应用程序和桌面 (Workspace 应用程序)
CAS 查询
Event-Type = "Session.Logon" AND Browser-Name !~ "<Browser-Name>"
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当用户输入凭据并登录其应用程序或桌面会话时，会触发 Session.Logon 事件。
Sigma 签名
author: Citrix®
date: 2023/01/31
description: This occurs when a user accesses content from an authorized browser which might cause an undesirable event or action through the internet.
detection:
condition: index_selection and selection and not filter
filter:
- browser_name|contains: '<Browser-Name>'
index_selection:
source: cas_siem_consumer://<env>_<tenant_identifier>
selection:
- occurrence_event_type: Session.logon
logsource:
product: citrixanalytics
service: security
title: Access from unauthorized browser
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未经授权的操作系统
当用户尝试访问的设备所使用的操作系统类型或版本不符合组织 IT 策略的规定，或存在安全漏洞时，会发生此情况。
详细信息
数据源：应用程序和桌面 (Workspace 应用程序)
CAS 查询
Event-Type = "Session.Logon" AND OS-Name ~ "<OS-Name>" AND OS-Version = "<OS-Version>" AND OS-Extra-Info = "<OS-Extra-Info>"
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Sigma 签名
author: Citrix
date: 2023/01/31
description: This occurs when a user attempts to access apps from servers with blocked listed operating systems.
detection:
condition: index_selection and selection
filter_null: []
index_selection:
source: cas_siem_consumer://<env>_<tenant_identifier>
selection:
occurrence_event_type: Session.logon
os_name|contains: '<OS-Name>'
os_version: '<OS-Version>'
os_extra_info: '<OS-Extra-Info>'
logsource:
product: citrixanalytics
service: security
title: Unauthorized operating systems in block list
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未经授权的 IP 地址或子网
当用户尝试从组织 IT 策略标记为未经授权的 IP 地址或范围进行访问时，会发生此情况。
详细信息
数据源：应用程序和桌面 (Workspace 应用程序)
CAS 查询
Event-Type = "Session.Logon" AND Client-IP = "<XX.YY.ZZ.*>"
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Sigma 签名
author: Citrix
date: 2023/01/31
description: This occurs when a user accessing content from an unauthorized IPs which might cause an undesirable event or action through the internet.
detection:
condition: selection and not filter_null and filter
filter:
- client_ip: '<IP>'
filter_null:
- client_ip: null
selection:
- occurrence_event_type: Session.Logon
logsource:
product: citrixanalytics
service: security
title: Access from unauthorized IP
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允许列表之外的未经授权的操作系统
当用户尝试从托管允许列表之外的操作系统的服务器访问应用程序时，会发生此情况。
详细信息
数据源：应用程序和桌面 (Workspace 应用程序)
CAS 查询
Event-Type = "Session.Logon" AND OS-Name !~ "<OS-Name>" AND OS-Version != "<OS-Version>" AND OS-Extra-Info != "<OS-Extra-Info>"
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Sigma 签名
author: Citrix
date: 2023/01/31
description: Unauthorized operating systems outside allow list
detection:
condition: selection and not filter_null and not filter_os and not filter_os_version and not filter_os_extra
filter_os:
- os_name|contains: '<OS INFO>'
filter_os_version:
- os_version: '<OS Version>'
filter_os_extra:
- os_extra_info: '<OS Extra Info>'
filter_null:
- os_name: null
- os_version: null
- os_extra_info: null
selection:
- occurrence_event_type: Session.Logon
logsource:
product: citrixanalytics
service: security
title: Unauthorized operating systems outside allow list
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未经授权的 Workspace 应用程序版本
当用户尝试访问不受支持的 Workspace 应用程序版本时，会发生此情况。在这种情况下，用户必须将其客户端升级到受支持的版本。有关更多信息，请参阅支持的客户端版本。
详细信息
数据源：应用程序和桌面 (Workspace 应用程序)
CAS 查询
Event-Type = "Session.Logon" AND Client-Type IN ("Windows", "Macintosh", "Unix/Linux") AND Workspace-App-Version != "20*" AND Workspace-App-Version != "21*"
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Sigma 签名
author: Citrix
date: 2023/01/31
description: Unsupported Workspace app versions
detection:
condition: selection and not filter_null and filter_product and not filter_product_version
filter_product:
- product: ['Windows', 'Mac', '<Other type>']
filter_product_version:
- product_version|contains: ['<Product Version1>', '<Product Version2>']
filter_null:
- product: null
- product_version: null
selection:
- occurrence_event_type: Session.Logon
logsource:
product: citrixanalytics
service: security
title: Unsupported Workspace app versions
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