alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Zbot UA"; flow:established,to_server; http.user_agent; content:"Windows NT 7.1"; content:"Firefox/9.1.2"; classtype:trojan-activity; sid:2015780; rev:6; metadata:created_at 2012_10_04, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_05_08;)