alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO Possible Sharepoint Resource Infection"; flow:established,to_client; http.stat_code; content:"409"; http.header_names; content:"|0d 0a|x-virus-infected|0d 0a|"; fast_pattern; content:"-location|0d 0a|"; distance:0; reference:url,docs.microsoft.com/en-us/openspecs/sharepoint_protocols/ms-wsshp/ba4ee7a8-704c-4e9c-ab14-fa44c574bdf4; classtype:bad-unknown; sid:2033698; rev:2; metadata:attack_target Client_and_Server, created_at 2021_08_10, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_04;)