alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Farfli.CUY Downloader"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/xghk.exe"; bsize:9; endswith; fast_pattern; http.host; pcre:"/^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$/W"; http.header_names; content:!"Referer"; reference:md5,c99397d66e49e2def1b17f57cd0c5fb9; classtype:trojan-activity; sid:2035900; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_04_12, deployment Perimeter, malware_family Win32_Farfli_CUY, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_14;)