alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Malicious User-Agent (UNK_FlappyBird)"; flow:established,to_server; http.user_agent; bsize:93; content:"Mozilla|2f|5|2e|0|20 28|Macintosh|3b 20|Intel|20|Mac|20|OS|20|X|20|10|5f|15|5f|7|29 20|AppleWebKit|2f|537|2e|36|20 28|KHTML|2c 20|like|20|Gecko|29 20|Chrome"; classtype:trojan-activity; sid:2058670; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2024_12_30, deployment Perimeter, former_category USER_AGENTS, malware_family Cobalt_Strike, malware_family UNK_FlappyBird, performance_impact Low, confidence High, signature_severity Major, updated_at 2024_12_31, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;)