alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/ClipBanker.OC CnC Activity M1"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/exp.php?usr="; startswith; fast_pattern; http.user_agent; content:"Mozilla/5.0 (Windows NT 10.0"; startswith; http.header_names; content:!"Referer"; reference:md5,40b3c1644d3bd1702fdde6eb08f961d2; classtype:trojan-activity; sid:2034982; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_01_26, deployment Perimeter, malware_family Win32_ClipBanker_OC, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_14;)