alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Operation Blockbuster User-Agent (Mozillar)"; flow:to_server,established; threshold:type limit, count 2, track by_src, seconds 300; http.user_agent; content:"Mozillar"; depth:8; nocase; fast_pattern; reference:url,securelist.com/blog/incidents/73914/operation-blockbuster-revealed/; reference:url,www.operationblockbuster.com/resources/index.html; classtype:trojan-activity; sid:2022564; rev:4; metadata:created_at 2016_02_24, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_06_24;)