alert ftp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/WhiskerSpy - FTP - Observed Creds"; flow:established,to_server; content:"USER winuser|0d 0a|"; content:"PASS eclip2e12#|0d 0a|"; reference:md5,cdf9e79b37ae70fb19b504f81e655d2a; reference:url,trendmicro.com/en_us/research/23/b/earth-kitsune-delivers-new-whiskerspy-backdoor.html; classtype:command-and-control; sid:2044254; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_02_20, deployment Perimeter, malware_family WhiskerSpy, performance_impact Low, confidence High, signature_severity Major, tag RAT, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_02_20; target:src_ip;)