FBI warns users to protect against rising Interlock ransomware threat
- On July 22, 2025, the FBI and CISA issued a warning about a rise in Interlock ransomware, attacking Windows and Linux systems.
- The ransomware employs tactics like credential stealing and lateral movement to deploy and execute its attack.
- Organizations must implement measures like multi-factor authentication and network segmentation to prevent successful attacks.
In the United States, the FBI and the Cybersecurity and Infrastructure Security Agency issued a joint advisory on July 22, 2025, regarding the increasing threat of Interlock ransomware. This form of ransomware is particularly alarming due to its targeting of both individual and organizational systems running on Windows and Linux operating systems. As investigations progressed, the FBI identified multiple indicators of compromise and detailed the malicious tactics, techniques, and procedures used by the attackers. They observed that after exploiting vulnerabilities, the adversaries deployed credential stealers and keyloggers to gain unauthorized access to system accounts. Subsequently, they executed the necessary lateral movement required to deploy ransomware, leading to the exfiltration of valuable data. Organizations were cautioned to take immediate preventative measures as outlined in the advisory, emphasizing that cybersecurity should prioritize proactive strategies over reactive ones. One of the most significant recommendations was the implementation of multi-factor authentication (MFA), especially during access to webmail, virtual private networks, and critical systems. The FBI’s detailed mitigation table serves as a guideline for actions organizations should take to bolster their defenses. Other preventive measures include enhancing web access firewalls, adhering to the NIST password standards, conducting routine reviews of account activities, and ensuring network segmentation to hinder lateral movements by adversaries. As part of the mitigation strategy, organizations are also advised to review their domain controllers, servers, workstations, and active directories for any unauthorized accounts. Additionally, the disabling of unused ports is recommended to reduce potential attack vectors. This ongoing increase in cyber threats, especially from ransomware like Interlock, necessitates a multi-layered approach to cybersecurity, where preparation and a strategic recovery plan play crucial roles in maintaining system integrity. In conclusion, the increasing sophistication of ransomware attacks exemplifies the necessity for robust cybersecurity practices among users and organizations alike. As the landscape of cyber threats continues to evolve, staying informed and prepared is vital for preventing significant vulnerabilities that can lead to dire financial and operational consequences.