I get a daily report from my honeypots for Cowrie activity [1], which includes telnet and SSH sessions attempted on the honyepot. One indicator I use to find sessions of interest is the number of commands run. Most of the time there are about 20 commands run per session, but a session with over 1,000 commands run in a session is unexpected.
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Article Link: CURLing for Crypto on Honeypots - SANS Internet Storm Center