Network Security
How One Open Port Can Expose Your Entire Network
A single forgotten port — RDP, SMB, a forgotten admin panel — is how most ransomware groups land their first foothold. Here's why, and how to find yours.
Ransomware groups don't pick targets the way studios pick titles. They scan the internet for open ports — RDP, SMB, exposed admin panels — and follow what answers.
The pattern
- An old test server is spun up and forgotten.
- RDP 3389 is open to the internet for a 'quick' contractor login.
- Credential-spray against the exposed port succeeds in hours.
- From that one host, the attacker moves laterally to file shares and renders.
What to do this week
Run an external port scan against every public IP you own — including cloud. Anything answering on 3389, 445, 5985, or non-standard admin ports needs a justification, an owner, and a closure date. Most don't.
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