alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Spy.Socelars.S CnC Activity M4 (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/base/api/"; startswith; content:".php"; endswith; http.host; pcre:"/^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$/"; http.user_agent; content:"???bll"; bsize:6; fast_pattern; http.header_names; content:!"Referer"; reference:md5,119501b9e0c53984d4af54644d7a7b47; classtype:trojan-activity; sid:2035188; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_02_14, deprecation_reason Age, malware_family Win32_Spy_Socelars_S, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_12_02, reviewed_at 2024_12_02;)