alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Filez Downloader Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; endswith; http.content_type; content:"application/x-www-form-urlencoded"; bsize:33; http.request_body; content:"filez=K0%2bqdI9kOlia"; startswith; nocase; fast_pattern; reference:md5,b4ebe61a7e0eff941669d74aedf44448; classtype:trojan-activity; sid:2047620; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_08_11, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_08_11;)