Summary

The Warlock ransomware group, also known as Storm-2603, breached SmarterTools by exploiting an unpatched SmarterMail server. The attack occurred on January 29, 2026, due to a failure to update the mail server to the latest version.

Key Points

• The breach was confirmed by SmarterTools on January 29, 2026.
• Warlock ransomware, also known as Storm-2603, was responsible for the attack.
• An unpatched instance of SmarterMail was exploited.
• Derek Curtis, Chief Commercial Officer of SmarterTools, provided details about the incident.
• Approximately 30 servers/VMs were part of the affected network.

Analysis

This incident highlights the critical importance of maintaining up-to-date software to prevent exploitation by ransomware groups. The breach of SmarterTools underscores the risks associated with unpatched systems, which can serve as entry points for cybercriminals. The attack by Warlock ransomware emphasizes the need for robust patch management practices to protect organizational infrastructure.

Conclusion

IT professionals should prioritize regular updates and patch management to mitigate the risk of ransomware attacks. Ensuring that all systems are up-to-date is crucial in safeguarding against vulnerabilities that can be exploited by threat actors.