alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Cobalt Strike Activity (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/field-keywords/"; fast_pattern; http.cookie; content:"PREF=ID="; startswith; http.user_agent; content:"_"; reference:url,cert.gov.ua/article/619229; reference:url,twitter.com/h2jazi/status/1544368077286039552; reference:md5,28f18fc7d9a0ab530742c2314cbd5c32; classtype:trojan-activity; sid:2037713; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_07_07, deployment Perimeter, deployment SSLDecrypt, malware_family TA471, malware_family UNC2589, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_07_07;)