alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cobalt Strike Activity (GET)"; flow:established,to_server; http.request_line; content:"GET /image-directory/templates.mp3 HTTP/1.1"; fast_pattern; http.accept; bsize:10; content:"image/jpeg"; http.header_names; content:!"Referer"; reference:url,twitter.com/malware_traffic/status/1470812160427233294; reference:md5,c681c785d6055a1d5a8fe74403c9dfe9; classtype:trojan-activity; sid:2034728; rev:3; metadata:attack_target Client_Endpoint, created_at 2021_12_14, deployment Perimeter, malware_family Cobalt_Strike, confidence Medium, signature_severity Major, updated_at 2024_04_04, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;)