Azure Virtual Network Device Modified or Deleted

Identifies when a virtual network device is being modified or deleted. This can be a network interface, network virtual appliance, virtual hub, or virtual router.

Sigma rule (View on GitHub)

 1title: Azure Virtual Network Device Modified or Deleted
 2id: 15ef3fac-f0f0-4dc4-ada0-660aa72980b3
 3status: test
 4description: |
 5    Identifies when a virtual network device is being modified or deleted.
 6    This can be a network interface, network virtual appliance, virtual hub, or virtual router.    
 7references:
 8    - https://learn.microsoft.com/en-us/azure/role-based-access-control/resource-provider-operations
 9author: Austin Songer @austinsonger
10date: 2021/08/08
11modified: 2022/08/23
12tags:
13    - attack.impact
14logsource:
15    product: azure
16    service: activitylogs
17detection:
18    selection:
19        operationName:
20            - MICROSOFT.NETWORK/NETWORKINTERFACES/TAPCONFIGURATIONS/WRITE
21            - MICROSOFT.NETWORK/NETWORKINTERFACES/TAPCONFIGURATIONS/DELETE
22            - MICROSOFT.NETWORK/NETWORKINTERFACES/WRITE
23            - MICROSOFT.NETWORK/NETWORKINTERFACES/JOIN/ACTION
24            - MICROSOFT.NETWORK/NETWORKINTERFACES/DELETE
25            - MICROSOFT.NETWORK/NETWORKVIRTUALAPPLIANCES/DELETE
26            - MICROSOFT.NETWORK/NETWORKVIRTUALAPPLIANCES/WRITE
27            - MICROSOFT.NETWORK/VIRTUALHUBS/DELETE
28            - MICROSOFT.NETWORK/VIRTUALHUBS/WRITE
29            - MICROSOFT.NETWORK/VIRTUALROUTERS/WRITE
30            - MICROSOFT.NETWORK/VIRTUALROUTERS/DELETE
31    condition: selection
32falsepositives:
33    - Virtual Network Device being modified or deleted may be performed by a system administrator. Verify whether the user identity, user agent, and/or hostname should be making changes in your environment.
34    - Virtual Network Device modified or deleted from unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule.
35level: medium

References

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