alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Possible Sharik/Smoke Loader Microsoft Connectivity check"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/kb/"; startswith; fast_pattern; pcre:"/^\d{4,8}$/R"; http.user_agent; content:!"Microsoft Outlook"; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; content:"|0d 0a|user-agent|0d 0a|"; content:!"|0d 0a|accept"; reference:md5,7e604b9e059d054d58c91330d4d88c62; classtype:trojan-activity; sid:2025120; rev:6; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_12_05, deployment Perimeter, confidence Medium, signature_severity Major, tag Smoke_Loader, updated_at 2024_05_01;)