alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE ELF/muBoT User-Agent (I'm a mu mu mu ?)"; flow:established,to_server; http.user_agent; content:"I|27|m a mu mu mu|20 3f|"; fast_pattern; startswith; reference:url,pastebin.com/EH1SH9aL; classtype:trojan-activity; sid:2021917; rev:3; metadata:affected_product Linux, created_at 2015_10_06, malware_family ELF_muBoT, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_06_02;)