alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE ELF/lizkebab CnC Activity (Server Banner)"; flow:established,from_server; content:"***|0d 0a|*|20 20 20 20 20 20 20 20|WELCOME TO THE BALL PIT|20 20 20 20 20 20 20 20|*|0d 0a|"; fast_pattern; content:"*|20 20 20 20 20|Now with|20|"; distance:0; reference:url,blog.malwaremustdie.org/2015/11/mmd-0044-2015-source-code-disclosure.html; classtype:command-and-control; sid:2022214; rev:2; metadata:affected_product Linux, created_at 2015_12_03, malware_family ELF_lizkebab, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_03_17;)