The Department of Homeland Security's Cybersecurity and Infrastructure Security Agency (CISA) has issued a warning to Network Administrators regarding an increase in Password Spraying attacks.
What is a Password Spraying Attack?
Pretty much exactly what it sounds like. It's a brute-force style attack where a would-be attacker literally sprays passwords at a user accounts until one sticks.
By using one password at a time across multiple accounts the attacker is usually able to remain undetected.
Attackers go after a wide array of targets including, but not limited to:
- Remote Desktop Software
- Active Directory Federated Services
- Cloud Services (i.e. Office365)
What to Look For
- A high number of authentication attempts within a set period of time
- Large numbers of bad usernames
- High number of account lockouts within a set period of time
How to Stop a Password Spraying Attack
- Implement multifactor authentication
- Use complex passwords
- Implement a strong password reset policy
- Increase alerting and monitoring
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