alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Legion Loader Activity Observed (carlos_castaneda)"; flow:established,to_server; http.user_agent; bsize:16; content:"carlos_castaneda"; nocase; fast_pattern; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; reference:md5,35d17e42e314a5ebf6ddd4a3d0b47712; classtype:command-and-control; sid:2029223; rev:5; 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 2024_04_30;)