alert tcp $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"GPL SCAN cybercop os probe"; flow:stateless; ack:0; flags:SFP; content:"AAAAAAAAAAAAAAAA"; depth:16; reference:arachnids,145; classtype:attempted-recon; sid:2101133; rev:13; metadata:created_at 2010_09_23, signature_severity Informational, updated_at 2019_07_26;)