alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO Outdated Browser Landing Page M2"; flow:established,to_client; http.stat_code; content:"200"; file.data; content:"|5c|nUpdate your browser"; nocase; content:"is out-of-date"; fast_pattern; nocase; reference:url,blog.group-ib.com/perswaysion; classtype:misc-activity; sid:2033997; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_09_21, deployment Perimeter, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_22;)