alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET RETIRED HTTPRevShell Initial CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; pcre:"/^\/[a-zA-Z0-9]{32}$/U"; http.header_names; content:!"User-Agent"; content:!"Referer"; http.request_body; content:"username="; content:"computername="; content:"processname="; fast_pattern; content:"processid="; content:"arch="; content:"cwd="; content:"internalip="; reference:md5,b77f17c914ba3af3bce2d98beb6cc4c6; classtype:trojan-activity; sid:2038611; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2022_08_24, deployment Perimeter, former_category MALWARE, malware_family HTTPRevShell, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_09_17, reviewed_at 2024_09_17;)