alert tcp $EXTERNAL_NET any -> $HOME_NET [23,2323,3323,4323] (msg:"ET TELNET busybox MEMES Hackers - Possible Brute Force Attack"; flow:to_server,established; content:"MEMES"; flowbits:isset,ET.telnet.busybox; threshold:type limit, count 1, track by_src, seconds 30; reference:url,lists.emergingthreats.net/pipermail/emerging-sigs/2016-August/027524.html; classtype:attempted-admin; sid:2023901; rev:1; metadata:affected_product Linux, attack_target Networking_Equipment, created_at 2017_02_14, deployment Perimeter, malware_family Mirai, performance_impact Moderate, confidence Medium, signature_severity Major, updated_at 2019_07_26;)