This joint Cybersecurity Advisory was coauthored by CISA and the Australian Cyber Security Centre, or ACSC. This advisory provides details on the top malware strains observed in 2021. AA22-216A Alert, Technical Details, and Mitigations For alerts on malicious and criminal cyber activity, see the FBI Internet Crime Complaint Center webpage. For more information and resources on protecting against and responding to ransomware, refer to StopRansomware.gov, a centralized, U.S. Government webpage providing ransomware resources and alerts. The ACSC recommends organizations implement eight essential mitigation strategies from the ACSC’s Strategies to Mitigate Cyber Security Incidents as a cybersecurity baseline. These strategies, known as the “Essential Eight,” make it much harder for adversaries to compromise systems. Refer to the ACSC’s practical guides on how to protect yourself against ransomware attacks and what to do if you are held at ransom at cyber.gov.au. All organizations should report incidents and anomalous activity to CISA’s 24/7 Operations Center at central@cisa.dhs.gov or (888) 282-0870 and to the FBI via your local FBI field office or the FBI’s 24/7 CyWatch at (855) 292-3937 or CyWatch@fbi.gov. Learn more about your ad choices. Visit megaphone.fm/adchoices