alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Sakula/Mivast RAT CnC Beacon 1"; flow:established,to_server; http.uri; content:".asp?imageid="; fast_pattern; http.header_names; to_lowercase; content:!"|0d 0a|content-type|0d 0a|"; content:!"|0d 0a|accept-"; content:!"|0d 0a|referer|0d 0a|"; reference:md5,3cd598e8e2fd033134d8784251eff59e; classtype:command-and-control; sid:2016139; rev:7; metadata:attack_target Client_Endpoint, created_at 2013_01_03, deployment Perimeter, signature_severity Major, tag c2, updated_at 2024_04_20, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)