Threat intelligence / Technique
TCP Connect Scan
An adversary uses full TCP connection attempts to determine if a port is open on the target system. The scanning process involves completing a 'three-way handshake' with a remote port, and reports the port as closed if the full handshake cannot be established. An advantage of TCP connect scanning is that it works against any TCP/IP stack.
Technique
TypeTechnique
External ID—
First seen2026-10-17
Last seen2026-10-17
Confidence
—
An adversary uses full TCP connection attempts to determine if a port is open on the target system. The scanning process involves completing a 'three-way handshake' with a remote port, and reports the port as closed if the full handshake cannot be established. An advantage of TCP connect scanning is that it works against any TCP/IP stack.
Labels
26 recorded
Relationships
1 external