S7comm Connection to Siemens PLC (port 102) from External Network

Emiliano Mema@Nosalva

•updated Aug 28, 2026•0•0•5

Detects incoming S7comm/ISO-TSAP connection attempts directed at Siemens Programmable Logic Controllers (PLCs) originating from an external network. This behavior is indicative of unauthorized access or reconnaissance attempts against Industrial Control System (ICS) assets.