alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Downloader.Small.BIL CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?a=Te"; fast_pattern; endswith; http.header_names; content:"|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|"; startswith; reference:md5,4C669A60719FC1051FB336CB25B209FD; classtype:command-and-control; sid:2025147; rev:5; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_12_13, deployment Perimeter, malware_family Downloader_Small_BIL, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_13;)