alert ftp-data $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Kimsuky Related Malicious VBScript Inbound M4"; flow:established,to_client; content:"CreateObject(|22|WScript.Shell|22|)"; content:"open"; nocase; content:"GET"; distance:0; within:10; content:".php?dhk="; fast_pattern; content:"&user="; content:"&fore="; reference:url,github.com/eset/malware-ioc/tree/master/kimsuky/hotdoge_donutcat_case; classtype:trojan-activity; sid:2034694; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_12_13, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_12_13;)