alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Operation Cobra Venom WSF Stage 1 - CnC Checkin"; flow:established,to_server; urilen:>14; http.method; content:"GET"; http.uri; content:"/board.php?v=a"; fast_pattern; endswith; http.header_names; content:!"Referer"; reference:url,blog.alyac.co.kr/2066; classtype:command-and-control; sid:2026764; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_01_08, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Operation_Cobra_Venom, updated_at 2020_09_16;)