alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Cobalt Strike User-Agent"; flow:established,to_server; http.user_agent; bsize:78; content:"Mozilla/5.0 (Windows NT 10.0|3b 20|Win32|3b 20|x32|3b 20|rv|3a|87.0b4) Gecko/201001 Firefox/87.0"; reference:md5,9f2fe567dfe655efe8da577990aac077; classtype:trojan-activity; sid:2032951; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_05_13, deployment Perimeter, malware_family CobaltStrike, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_12;)