alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/WhiskerSpy CnC Activity"; flow:established,to_server; http.content_type; content:"multipart|2f|form|2d|data|3b 20|boundary|3d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d 2d|81fd830c85363675"; bsize:60; threshold:type limit, count 1, seconds 300, track by_src; reference:md5,8fb3695d1487b55aaf380190a0524098; reference:url,trendmicro.com/en_us/research/23/b/earth-kitsune-delivers-new-whiskerspy-backdoor.html; classtype:command-and-control; sid:2044253; 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, deployment SSLDecrypt, malware_family WhiskerSpy, performance_impact Low, confidence High, signature_severity Major, tag RAT, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_02_20;)