alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE ELF/muBoT IRC Activity 5"; flow:established,from_server; content:"NOTICE"; content:"|3a|Flooding with TCP"; fast_pattern; distance:0; reference:url,pastebin.com/EH1SH9aL; classtype:trojan-activity; sid:2021916; rev:2; metadata:affected_product Linux, created_at 2015_10_06, malware_family ELF_muBoT, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_02_23;)