alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Bamital Headers - Likely CnC Beacon"; flow:established,to_server; http.user_agent; content:"Mozilla/5.0 (compatible|3b 20|MSIE 9.0|3b 20|Windows NT 6.1|3b 20|WOW64|3b 20|Trident/5.0)"; fast_pattern; http.header_names; content:"|0d 0a|Host|0d 0a|Accept|0d 0a|Connection|0d 0a|"; depth:28; content:!"Referer"; content:!"Accept-"; content:"User-Agent|0d 0a 0d 0a|"; endswith; classtype:command-and-control; sid:2019755; rev:6; metadata:attack_target Client_Endpoint, created_at 2014_11_20, deployment Perimeter, confidence Medium, signature_severity Major, tag c2, updated_at 2020_09_15, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)