alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE WikiLoader Activity M4 (Response)"; flow:established,to_client; flowbits:set,ET.wikiloader; file.data; content:"</option><!--gmail|20|"; fast_pattern; pcre:"/^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})/R"; content:"|20|-->"; distance:0; reference:md5,c5b76423675f8ef473225a753f0ce626; reference:url,securityintelligence.com/x-force/wailingcrab-malware-misues-mqtt-messaging-protocol/; classtype:trojan-activity; sid:2049275; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_11_21, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_11_21; target:dest_ip;)