alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Sakula/Mivast RAT CnC Beacon 7"; flow:to_server,established; http.method; content:"GET"; http.uri; content:".jpg?vid="; fast_pattern; pcre:"/\.jpg\?vid=\d+$/"; http.header_names; content:!"Accept"; content:!"Referer|0d 0a|"; reference:url,www.secureworks.com/cyber-threat-intelligence/threats/sakula-malware-family/; classtype:command-and-control; sid:2021570; rev:5; metadata:attack_target Client_Endpoint, created_at 2015_08_01, deployment Perimeter, signature_severity Major, tag c2, updated_at 2020_10_01, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)