alert http $EXTERNAL_NET any -> $HTTP_SERVERS any (msg:"ET SCAN SQLNinja MSSQL XPCmdShell Scan"; flow:to_server,established; content:"?param=a"; content:"exec%20master%2E%2Exp%5Fcmdshell"; distance:2; reference:url,sqlninja.sourceforge.net/index.html; classtype:attempted-recon; sid:2009039; rev:5; metadata:created_at 2010_07_30, confidence Medium, signature_severity Informational, updated_at 2019_09_27;)