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Microsoft DCOM
TCP port 1026 is frequently associated with Microsoft Distributed Component Object Model (DCOM) services. DCOM enables software components to communicate over a network, facilitating distributed computing on Windows environments. This port is notorious for being targeted by malware and pop-up spam, especially when RPC services listen on this port..
Port 1026 mainly supports the Microsoft Distributed Component Object Model (DCOM), a crucial technology that allows seamless communication between software components distributed across networked systems. DCOM is built on top of the Remote Procedure Call (RPC) protocol, enabling programs to invoke methods on remote objects as if they were local, thus facilitating distributed computing in enterprise Windows environments.
During initial connections, the RPC Endpoint Mapper (typically on port 135) assigns dynamic ports between 1024 and 65535, including 1026, for follow-up traffic. As such, port 1026 itself is not a fixed DCOM port but a common target due to dynamic allocations or legacy configurations, making it frequently visible during network scans involving Windows RPC or DCOM services.
Because this port is often dynamically assigned, it can also appear in conjunction with Windows Messenger services in older Windows versions, historically making it a vector for unsolicited messenger pop-ups and spam before the service's deprecation and stricter firewall deployments.