alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Sakula/Mivast RAT CnC Beacon 3"; flow:to_server,established; http.method; content:"GET"; http.uri; content:".asp?resid="; fast_pattern; content:"&photoid="; http.header_names; content:!"Accept-"; content:!"Referer"; reference:md5,3cd598e8e2fd033134d8784251eff59e; classtype:command-and-control; sid:2021201; rev:4; metadata:attack_target Client_Endpoint, created_at 2015_06_08, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_08_18, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)