alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/KLBanker Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php"; endswith; http.user_agent; content:"|22|Mozilla/5.0|20|"; fast_pattern; startswith; content:"|22|"; endswith; http.header_names; content:!"Referer|0d 0a|"; reference:md5,787ebc17ec47acb30b69a4978717b4dc; reference:url,twitter.com/StopMalvertisin/status/1653317886289797120; classtype:trojan-activity; sid:2045613; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_05_08, deployment Perimeter, malware_family Win32_KLBanker, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_08; target:src_ip;)