An alert issued on Tuesday by the FBI warns about an increase in PYSA ransomware attacks on education institutions in the United States and the United Kingdom.
Last year, authorities in the UK and France also issued alerts for the PYSA ransomware, following attacks on government and other types of organizations.
According to the FBI, PYSA attacks have been launched by “unidentified cyber actors” against higher education, K-12 schools and seminaries in a dozen U.S. states, as well as the U.K.
The threat actors behind PYSA attacks are known to encrypt data on compromised systems, but they also steal information from victims and threaten to leak it in an effort to increase their chances of getting paid.
PYSA, also known as Mespinoza, has been around since at least October 2019 and the FBI has been tracking it since March 2020. PYSA ransomware attacks have been observed against government organizations, educational institutions, the healthcare sector and private businesses.
The threat actors often use phishing and RDP attacks for initial access to targeted networks, and then use tools such as Advanced Port/IP Scanner, PowerShell Empire, Mimikatz and Koadic to gain further access.
After exfiltrating potentially valuable files from the victim’s network — this often includes employment records and financial information — the cybercriminals start encrypting files on Windows and Linux devices.
The FBI’s alert contains some technical information on these attacks, as well as indicators of compromise (IoC). The agency has advised organizations not to pay up, but noted that it “understands that when victims are faced with an inability to function, all options are evaluated to protect shareholders, employees and customers.”
Victims of PYSA ransomware attacks have been advised to file a report with the FBI.
“Educational institutions are big targets for hackers as thousands of people’s sensitive information is potentially involved, and the substantial shift towards e-learning has made them even more appealing to hackers and ransomware,” James Carder, CSO at LogRhythm, told SecurityWeek. “These attacks on schools can bring education to a halt while potentially exposing every student and teacher’s personal data within the organization. Parents are also targets and may be coerced into paying ransom for personal information or school assignments if information falls into bad actors’ hands.”
“This FBI warning is an important reminder that educational institutions need to take a proactive approach and invest in cybersecurity solutions that detect malicious behavior and enable network infrastructure to block any further access attempts. Institutions should patch aggressively, create backups, prepare a response plan, and prioritize educational training to ensure they are equipped to handle attacks and proceed without disruption,” Carder added.
Over the past year, the FBI issued advisories to warn organizations about attacks involving DoppelPaymer, NetWalker and Egregor ransomware.
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