alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Ursnif Variant CnC Beacon 3"; flow:established,to_server; http.method; content:"GET"; http.user_agent; content:"Mozilla/"; startswith; http.request_body; content:"|20 7c 20 22|0x"; fast_pattern; content:"_"; distance:0; content:"|22 20 7c 20|"; distance:0; http.header_names; content:!"|0d 0a|Accept"; content:!"Referer|0d 0a|"; reference:md5,f48f626cf746a2c3c73182c752c481b6; reference:md5,8ab21ac9199d3ced2230924b90f49f0d; classtype:command-and-control; sid:2021814; rev:4; metadata:attack_target Client_Endpoint, created_at 2015_09_23, deployment Perimeter, signature_severity Major, tag c2, updated_at 2024_03_10, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)