CISA (Cybersecurity and Infrastructure Security Agency) – US

The Cybersecurity and Infrastructure Security Agency (CISA) is a federal agency under the US Department of Homeland Security that was established in 2018. It is responsible for protecting the nation's critical infrastructure from cyber and physical threats and serves as the federal coordinator for cybersecurity incident response. CISA publishes detailed threat advisories on active cyberattacks including ransomware campaigns, phishing toolkits, and vulnerabilities being actively exploited by criminal groups and nation-state actors.

For individual consumers, CISA's most directly useful resources are its cybersecurity awareness guidance published at cisa.gov, the Stop Ransomware portal (stopransomware.gov), and the #StopRansomware advisories that describe specific ransomware variants and indicators of compromise. CISA also promotes the Shields Up programme, which advises businesses and consumers to heighten security posture during periods of elevated threat.

CISA is not primarily a consumer complaint agency; fraud victims should report to IC3 and the FTC. However, organisations (including hospitals, schools, and local governments) that experience cyberattacks including ransomware should report to CISA at cisa.gov/report. CISA can deploy technical assistance teams to help victims respond. CISA's Cyber Essentials guide is freely available and provides a practical baseline security framework for small organisations and individuals.