3.11.md

3.11 - Unusual number of firewall rules modified in the last 7 days

Unusual number of firewall rules modified on any given day in the last 7 days, where unusual is defined as daily_count > avg(daily_count) + 2 * stddev(daily_count), and daily_count is the number of change actions on a given day. Aggregate averages and standard deviations are computed for each day looking back at the preceding daily counts. Default lookback window is the last 90 days.

Category: Cloud Provisioning Activity
Use Cases: Detect
Data Sources: Audit Logs - Admin Activity

Queries or Rules

BigQuery	Chronicle
SQL	Contribute rule

Event Generation

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Sample Event

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