alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Hyteod CnC Beacon"; flow:established,to_server; http.method; content:"GET"; http.header; content:"|5f 5e 5b 8b e5 5d|"; fast_pattern; http.user_agent; bsize:63; content:"Mozilla/5.0 (compatible|3b 20|MSIE 9.0|3b 20|Windows NT 6.1|3b 20|Trident/5.0)"; http.content_type; bsize:33; content:"application/x-www-form-urlencoded"; http.header_names; to_lowercase; content:!"|0d 0a|accept-"; content:!"|0d 0a|connection|0d 0a|"; content:!"|0d 0a|referer|0d 0a|"; reference:md5,f2ad19a08063171b039accd24b0c27ca; classtype:command-and-control; sid:2020821; rev:6; metadata:attack_target Client_Endpoint, created_at 2015_03_31, deployment Perimeter, malware_family Win32_Hyteod, confidence Medium, signature_severity Major, tag c2, updated_at 2024_04_29, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)