alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE DDoS.XOR Checkin"; flow:to_server,established; content:"BB2FA36AAA9541F0"; depth:500; reference:url,blog.malwaremustdie.org/2014/09/mmd-0028-2014-fuzzy-reversing-new-china.html; classtype:command-and-control; sid:2020381; rev:3; metadata:created_at 2015_02_07, malware_family XorDDoS, signature_severity Major, updated_at 2019_07_26;)