alert tcp any 666 -> any any (msg:"ET MALWARE ELF/BASHLITE CnC Activity (Response)"; flow:established,to_client; content:"|21 20|DUP"; content:"epoll_"; distance:0; isdataat:!1,relative; fast_pattern; reference:md5,d76cebc82c79b9d7c56bced94c03c9e8; classtype:trojan-activity; sid:2032080; rev:2; metadata:affected_product Linux, created_at 2021_03_16, malware_family ELF_BASHLITE, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_03_16, reviewed_at 2023_12_11;)