LoFP / firewall rule configuration modified or deleted from unfamiliar users should be investigated. if known behavior is causing false positives, it can be exempted from the rule.

Techniques

Sample rules

Azure Firewall Rule Configuration Modified or Deleted

source: sigma
technicques:

Description

Identifies when a Firewall Rule Configuration is Modified or Deleted.

Detection logic

condition: selection
selection:
  operationName:
  - MICROSOFT.NETWORK/FIREWALLPOLICIES/RULECOLLECTIONGROUPS/WRITE
  - MICROSOFT.NETWORK/FIREWALLPOLICIES/RULECOLLECTIONGROUPS/DELETE
  - MICROSOFT.NETWORK/FIREWALLPOLICIES/RULEGROUPS/WRITE
  - MICROSOFT.NETWORK/FIREWALLPOLICIES/RULEGROUPS/DELETE