alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET HUNTING Obfuscated fromCharCode"; flow:established,from_server; file_data; content:"|22|f"; nocase; content:!"romCharcode"; nocase; within:11; pcre:"/^(?:\x22\s*?\+\s*?\x22)?r(?:\x22\s*?\+\s*?\x22)?o(?:\x22\s*?\+\s*?\x22)?m(?:\x22\s*?\+\s*?\x22)?C(?:\x22\s*?\+\s*?\x22)?h(?:\x22\s*?\+\s*?\x22)?a(?:\x22\s*?\+\s*?\x22)?r(?:\x22\s*?\+\s*?\x22)?c(?:\x22\s*?\+\s*?\x22)?o(?:\x22\s*?\+\s*?\x22)?d(?:\x22\s*?\+\s*?\x22)?e/Ri"; classtype:bad-unknown; sid:2017565; rev:5; 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;)