This documentation contains work-in-progress information for future Elastic Stack and Cloud releases. Use the version selector to view supported release docs. It also contains some Elastic Cloud serverless information. Check out our serverless docs for more details.

« Azure Firewall Policy Deletion Azure Full Network Packet Capture Detected »

› › ›

Azure Frontdoor Web Application Firewall (WAF) Policy Deleted

edit

Azure Frontdoor Web Application Firewall (WAF) Policy Deleted

edit

Identifies the deletion of a Frontdoor Web Application Firewall (WAF) Policy in Azure. An adversary may delete a Frontdoor Web Application Firewall (WAF) Policy in an attempt to evade defenses and/or to eliminate barriers to their objective.

Rule type: query

Rule indices:

filebeat-*
logs-azure*

Severity: low

Risk score: 21

Runs every: 5 minutes

Searches indices from: now-25m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

https://docs.microsoft.com/en-us/azure/role-based-access-control/resource-provider-operations#networking

Tags:

Elastic
Cloud
Azure
Continuous Monitoring
SecOps
Network Security

Version: 101 (version history)

Added (Elastic Stack release): 7.16.0

Last modified (Elastic Stack release): 8.6.0

Rule authors: Austin Songer

Rule license: Elastic License v2

Potential false positives

edit

Azure Front Web Application Firewall (WAF) Policy deletions may be done by a system or network administrator. Verify whether the username, hostname, and/or resource name should be making changes in your environment. Azure Front Web Application Firewall (WAF) Policy deletions by unfamiliar users or hosts should be investigated. If known behavior is causing false positives, it can be exempted from the rule.

Investigation guide

edit

Rule query

edit

event.dataset:azure.activitylogs and azure.activitylogs.operation_name
:"MICROSOFT.NETWORK/FRONTDOORWEBAPPLICATIONFIREWALLPOLICIES/DELETE"
and event.outcome:(Success or success)