Port :1524Ingreslock

Port 1524 was initially associated with Ingres, an enterprise relational database management system. Typically, Ingres used this port internally to enable remote management functions and database communication. It sometimes became exposed externally due to misconfigurations, creating risks for database environments relying on network interactions.

Historically, this port gained notoriety because malicious actors exploited it via the Ingreslock backdoor trojan. The trojan would listen on port 1524, enabling unauthorized remote shell access. Its presence was typically the result of post-compromise activity, where attackers installed it after initial exploitation to maintain persistence without raising suspicion.

Due to its connection with remote management and known abuses, security practitioners view any open port 1524 as suspicious unless explicitly required and controlled. Modern usage of this port for legitimate Ingres databases often avoids internet exposure, instead residing behind strong access controls and internal network segmentation.