The Federal Bureau of Investigation (FBI), the Cybersecurity and Infrastructure Security Agency (CISA), and the Department of Health and Human Services (HHS) released a joint Cybersecurity Advisory (CSA) alert on Nov. 17 regarding Hive Ransomware.
The alert states that “As of November 2022, Hive ransomware actors have victimized over 1,300 companies worldwide, receiving approximately US$100 million in ransom payments, according to FBI information. Hive ransomware follows the ransomware-as-a-service (RaaS) model in which developers create, maintain, and update the malware, and affiliates conduct the ransomware attacks. From June 2021 through at least November 2022, threat actors have used Hive ransomware to target a wide range of businesses and critical infrastructure sectors, including Government Facilities, Communications, Critical Manufacturing, Information Technology, and especially Healthcare and Public Health (HPH).”
Further, “The method of initial intrusion will depend on which affiliate targets the network. Hive actors have gained initial access to victim networks by using single factor logins via Remote Desktop Protocol (RDP), virtual private networks (VPNs), and other remote network connection protocols [T1133]. In some cases, Hive actors have bypassed multifactor authentication (MFA) and gained access to FortiOS servers by exploiting Common Vulnerabilities and Exposures (CVE) CVE-2020-12812. This vulnerability enables a malicious cyber actor to log in without a prompt for the user’s second authentication factor (FortiToken) when the actor changes the case of the username.”
This is not the first time that warnings and alerts have been issued about the group and its threat to the healthcare sector. The Hive ransomware group was first observed in June of 2021. In September of 2021 we reported that the FBI has released an alert about the malicious Hive ransomware, the same group that took down Memorial Health System on Aug. 15. In March of 2022 we reported that the Hive Ransomware group posted on its dark website that it had stolen 850,000 personally identified information (PII) records from the Partnership HealthPlan of California. The analyst note cites a report that in its first 100 days as a group, Hive breached 355 companies.
In April of 2022 we reported that HHS’s Health Sector Cybersecurity Coordination Center (HC3) published an analyst note on April 18 warning healthcare and the public health sector of the Hive ransomware group.
The current alert recommends mitigations including but not limited to:
- Verifying Hive actors no longer have access to the network by installing updates for operating systems, software, and firmware
- Requiring phishing-resistant multifactor authentication for as many services as possible, especially webmail, VPNS, and for accounts that have access to critical systems
- If using an RDP [remote desktop protocol], ensure and monitor it
- Maintaining offline backups of data
- Ensuring backups of data are encrypted
The alert adds that “If your organization is impacted by a ransomware incident, FBI, CISA, and HHS recommend the following actions.
- Isolate the infected system. Remove the infected system from all networks, and disable the computer’s wireless, Bluetooth, and any other potential networking capabilities. Ensure all shared and networked drives are disconnected.
- Turn off other computers and devices. Power-off and segregate (i.e., remove from the network) the infected computer(s). Power-off and segregate any other computers or devices that share a network with the infected computer(s) that have not been fully encrypted by ransomware. If possible, collect and secure all infected and potentially infected computers and devices in a central location, making sure to clearly label any computers that have been encrypted. Powering-off and segregating infected computers and computers that have not been fully encrypted may allow for the recovery of partially encrypted files by specialists.
- Secure your backups. Ensure that your backup data is offline and secure. If possible, scan your backup data with an antivirus program to check that it is free of malware.”