alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET HUNTING Obfuscated fromCharCode"; flow:established,from_server; file_data; content:"|27|f"; nocase; content:!"romCharcode"; nocase; within:11; pcre:"/^(?:\x27\s*?\+\s*?\x27)?r(?:\x27\s*?\+\s*?\x27)?o(?:\x27\s*?\+\s*?\x27)?m(?:\x27\s*?\+\s*?\x27)?C(?:\x27\s*?\+\s*?\x27)?h(?:\x27\s*?\+\s*?\x27)?a(?:\x27\s*?\+\s*?\x27)?r(?:\x27\s*?\+\s*?\x27)?c(?:\x27\s*?\+\s*?\x27)?o(?:\x27\s*?\+\s*?\x27)?d(?:\x27\s*?\+\s*?\x27)?e/Ri"; classtype:bad-unknown; sid:2017566; rev:6; metadata:created_at 2013_10_08, former_category INFO, confidence Medium, signature_severity Minor, updated_at 2024_11_29, mitre_tactic_id TA0005, mitre_tactic_name Defense_Evasion, mitre_technique_id T1027, mitre_technique_name Obfuscated_Files_or_Information;)