Brute force attempt from suspicious IP by user email

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Classification:

attack

Tactic:

TA0006-credential-access

Technique:

T1110-brute-force

Goal

Detect a brute force attack on a user across log sources.

Strategy

To identify a successful attempt: Detect when the same user fails to log in five times, and then successfully logs in. This generates a MEDIUM severity signal.

To identify an unsuccessful attempt: Detect when the same user fails to log in ten times. This generates an INFO severity signal.

Triage and response

  1. Inspect the logs to see if this was a valid login attempt.
  2. Verify if 2FA was authenticated.
  3. If the user was compromised, rotate user credentials.