alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET RETIRED ZenRAT Status Response"; flow:established,to_client; flowbits:isset,ET.ZenRATStatus; content:"|00 0d 00 00 00 00 00 00 00|"; startswith; pcre:"/^[\x00-\xff]\x00{3}$/R"; reference:md5,6f809b1c82d9fb6cd277c6b645ecaf84; classtype:trojan-activity; sid:2047757; rev:2; metadata:attack_target Client_and_Server, created_at 2023_08_25, deployment Perimeter, former_category MALWARE, malware_family ZenRAT, performance_impact Low, confidence High, signature_severity Major, updated_at 2024_11_24, reviewed_at 2023_08_25; target:dest_ip;)