alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE DustySky CnC Beacon"; flow:established,to_server; http.uri; content:".php?"; content:"Pn="; nocase; distance:0; fast_pattern; content:"&ID="; nocase; content:"&o="; content:"&av="; http.header_names; content:!"Accept"; content:!"Referer|0d 0a|"; reference:md5,07fd870e4ea8dd6b9503a956b5bb47f3; classtype:command-and-control; sid:2021919; rev:7; metadata:attack_target Client_Endpoint, created_at 2015_10_06, deployment Perimeter, performance_impact Moderate, signature_severity Major, tag c2, updated_at 2024_04_22, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)