Credential Stuffing Attack on Azure

azure

Classification:

attack

Tactic:

TA0006-credential-access

Technique:

T1110-brute-force

Set up the azure integration.

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Goal

Detect and identify the network IP address or user agent when multiple user accounts have login attempt activities recorded.

Strategy

Monitor Azure Active Directory and detect when any @evt.category is equal to SignInLogs and at least 5 of the @evt.outcome are equal to false by the same network IP address or user agent.

Security Signal returns MEDIUM if`@evt.outcomehas value ofsuccess` after 5 multiple failed logins by the same network IP address or user agent.

Triage and response

  1. Inspect the log and determine if this was a valid login attempt.
  2. If the user was compromised, rotate user credentials.

Changelog

  • 14 June 2022 - Updated triggering cases to align with other credential stuffing rules. Also updated other backend options to reduce noise levels.
  • 26 October 2022 - Updated query.