alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE ModPipe CnC Activity (Response)"; flow:established,to_client; http.stat_code; content:"405"; file.data; content:"|20 20 20 20 20 20 20 20 20 20 20 20 20 3c 21 2d 2d|"; fast_pattern; reference:url,www.welivesecurity.com/2020/11/12/hungry-data-modpipe-backdoor-hits-pos-software-hospitality-sector; classtype:command-and-control; sid:2031209; rev:1; metadata:created_at 2020_11_16, performance_impact Moderate, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_16;)