alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE ELF/lizkebab CnC Activity (Flooding 1)"; flow:established,to_server; content:"|20|Flooding|20|"; fast_pattern; content:"|20|for|20|"; content:"|20|seconds."; distance:0; pcre:"/(?:JUNK|HOLD) Flooding (?:\d{1,3}\.){3}\d{1,3} for \d+ seconds.\r?\n/"; reference:url,blog.malwaremustdie.org/2015/11/mmd-0044-2015-source-code-disclosure.html; classtype:command-and-control; sid:2022213; rev:2; metadata:affected_product Linux, created_at 2015_12_03, malware_family ELF_lizkebab, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_10_08;)