alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Legion Loader Activity Observed (carlos_castaneda)"; flow:established,to_server; http.user_agent; content:"carlos_castaneda"; nocase; fast_pattern; bsize:16; http.header_names; content:!"Referer"; reference:md5,35d17e42e314a5ebf6ddd4a3d0b47712; classtype:command-and-control; sid:2029223; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_01_03, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_27;)