alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS Suspicious User-Agent (kath)"; flow:established,to_server; http.user_agent; content:"kath"; fast_pattern; depth:4; endswith; bsize:4; reference:md5,2ed86e80ea9b4b95b3e52ed77ea6c401; reference:url,cloudsek.com/yourcyanide-an-investigation-into-the-frankenstein-ransomware-that-sends-malware-laced-love-letters/; classtype:bad-unknown; sid:2037747; rev:2; metadata:attack_target Client_Endpoint, created_at 2022_07_12, deployment Perimeter, deployment SSLDecrypt, deprecation_reason Age, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_12_02, reviewed_at 2024_12_02;)