alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Onliner CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/adm.php"; fast_pattern; endswith; http.request_body; content:"k="; depth:2; pcre:"/^\d{5,10}$/R"; http.accept_lang; content:"en-US|3b|q=0.5,en|3b|q=0.3"; http.header_names; content:!"Referer"; content:"Content"; content:"User-Agent"; reference:url,www.blueliv.com/blog/research/analysis-spam-distribution-botnet-onliner-spambot/; classtype:command-and-control; sid:2027807; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_08_06, deployment Perimeter, malware_family Onliner, performance_impact Low, confidence High, signature_severity Major, tag SpamBot, updated_at 2020_09_17;)