alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE SpyAgent C&C Activity (Request)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"update.php?id="; fast_pattern; pcre:"/^[0-9]{9}/R"; content:"&stat="; pcre:"/^[0-9a-zA-Z]{32}/R"; http.connection; content:"Keep-Alive"; bsize:10; http.header_names; content:!"Referer|0d 0a|"; reference:url,trendmicro.com/en_us/research/21/k/campaign-abusing-rats-uses-fake-websites.html; classtype:command-and-control; sid:2034573; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_12_01, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_05_03;)