alert http $EXTERNAL_NET any -> $HTTP_SERVERS any (msg:"ET SCAN Skipfish Web Application Scan Detected (2)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".old"; http.header; content:"Range|3A| bytes=0-199999"; http.user_agent; content:"Mozilla/5.0 SF/"; reference:url,isc.sans.org/diary.html?storyid=8467; reference:url,code.google.com/p/skipfish/; classtype:attempted-recon; sid:2010956; rev:5; metadata:created_at 2010_07_30, confidence Medium, signature_severity Informational, updated_at 2020_05_04;)