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- alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET SCAN NMAP -sS window 2048"; fragbits:!D; dsize:0; flags:S,12; ack:0; window:2048; threshold: type both, track by_dst, count 1, seconds 60; reference:url,doc.emergingthreats.net/2000537; classtype:attempted-recon; sid:2000537; rev:8; metadata:created_at 2010_07_30, updated_at 2010_07_30;)
- alert ip $EXTERNAL_NET any -> $HOME_NET any (msg:"ET SCAN NMAP -sO"; dsize:0; ip_proto:21; threshold: type both, track by_dst, count 1, seconds 60; reference:url,doc.emergingthreats.net/2000536; classtype:attempted-recon; sid:2000536; rev:7; metadata:created_at 2010_07_30, updated_at 2010_07_30;)
- alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET SCAN NMAP -sS window 1024"; fragbits:!D; dsize:0; flags:S,12; ack:0; window:1024; threshold: type both, track by_dst, count 1, seconds 60; reference:url,doc.emergingthreats.net/2009582; classtype:attempted-recon; sid:2009582; rev:3; metadata:created_at 2010_07_30, updated_at 2010_07_30;)
- alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET SCAN NMAP -sS window 3072"; fragbits:!D; dsize:0; flags:S,12; ack:0; window:3072; threshold: type both, track by_dst, count 1, seconds 60; reference:url,doc.emergingthreats.net/2009583; classtype:attempted-recon; sid:2009583; rev:3; metadata:created_at 2010_07_30, updated_at 2010_07_30;)
- alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET SCAN NMAP -sS window 4096"; fragbits:!D; dsize:0; flags:S,12; ack:0; window:4096; threshold: type both, track by_dst, count 1, seconds 60; reference:url,doc.emergingthreats.net/2009584; classtype:attempted-recon; sid:2009584; rev:2; metadata:created_at 2010_07_30, updated_at 2010_07_30;)
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