alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cobalt Strike Beacon Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/static-directory/bn.png"; fast_pattern; bsize:24; http.header_names; content:!"Referer"; http.user_agent; content:"Linux|3b 20|Android|20|"; reference:url,twitter.com/kienbigmummy/status/1468836018560192512; reference:md5,f3e31cd5f0972e4dbc789807ad2d129b; classtype:trojan-activity; sid:2034646; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_12_09, deployment Perimeter, deployment SSLDecrypt, malware_family CobaltStrike, confidence Medium, signature_severity Major, tag c2, updated_at 2021_12_09, reviewed_at 2023_08_22, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)