alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS Suspicious User-Agent (USERAGENT)"; flow:established,to_server; http.user_agent; content:"USERAGENT"; nocase; startswith; endswith; reference:md5,cd0e98508657b208219d435f9ac9d76c; reference:md5,cd100abc8eedf2119c7e6746975d7773; classtype:trojan-activity; sid:2034066; rev:9; metadata:created_at 2011_11_22, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_13;)