alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET RETIRED ZenRAT Request Module Command"; flow:established,to_server; flowbits:set,ET.ZenRATModuleRequest; dsize:<100; stream_size:client,<,100; content:"|02 4d 00 00 00 00 00 00 00|"; startswith; pcre:"/([\x00-\xff]\x00{7}){2}[\x00-\xff]\x00{3}$/R"; reference:md5,6f809b1c82d9fb6cd277c6b645ecaf84; classtype:trojan-activity; sid:2047759; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2023_08_25, deployment Perimeter, malware_family ZenRAT, performance_impact Low, confidence High, signature_severity Major, updated_at 2025_05_02, reviewed_at 2025_07_14; target:src_ip;)