alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cobalt Strike Activity (GET)"; flow:established,to_server; http.request_line; content:"GET /api/market HTTP/1.1"; fast_pattern; http.cookie; content:"nyt-a="; startswith; pcre:"/^[A-Za-z0-9-_]{176}$/R"; reference:md5,31b8467ad176116d238afa2fa6bf6497; reference:url,twitter.com/h2jazi/status/1483504922003968003; classtype:trojan-activity; sid:2034941; rev:2; metadata:attack_target Client_Endpoint, created_at 2022_01_19, deployment Perimeter, deployment SSLDecrypt, malware_family Cobalt_Strike, confidence Medium, signature_severity Major, updated_at 2022_01_20, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;)