alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET USER_AGENTS BLEXBot User-Agent"; flow:established,to_server; threshold:type limit, track by_dst, count 1, seconds 300; http.user_agent; content:"Mozilla/5.0 (compatible|3b 20|BLEXBot/"; fast_pattern; startswith; reference:url,webmeup.com/about.html; classtype:misc-activity; sid:2022775; rev:3; metadata:created_at 2016_05_02, confidence High, signature_severity Minor, updated_at 2020_07_07;)