alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET HUNTING SUSPICIOUS Local file read using read protocol"; flow:established,to_client; file_data; content:"read|3a|"; nocase; fast_pattern; byte_test:1,>,0x21,-6,relative; byte_test:1,<,0x28,-6,relative; byte_test:1,!=,0x23,-6,relative; byte_test:1,!=,0x24,-6,relative; byte_test:1,!=,0x25,-6,relative; byte_test:1,!=,0x26,-6,relative; pcre:"/^\s*,\s*[a-zA-Z]\x3a[\x2f\x5c]/Ri"; reference:url,www.brokenbrowser.com/abusing-of-protocols/; classtype:misc-activity; sid:2024031; rev:2; metadata:attack_target Client_Endpoint, created_at 2017_03_06, malware_family BrokenBrowser, confidence Medium, signature_severity Major, updated_at 2019_07_26;)