The NCCIC, in collaboration with the Australian Cyber Security Centre, the Canadian Centre for Cyber Security, the New Zealand National Cyber Security Centre, and the United Kingdom National Cyber Security Centre, has released a joint Activity Alert that highlights five publicly available tools frequently observed in cyber incidents worldwide. The alert provides an overview of each tool, its capabilities, and recommended best practices network defenders can use to protect their networks against these tools. The NCCIC encourages users and administrators to review the full alert for more information. NCCIC/US-CERT.