alert tcp $EXTERNAL_NET any -> $HOME_NET 22 (msg:"GPL SHELLCODE ssh CRC32 overflow NOOP"; flow:to_server,established; content:"|90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90|"; reference:bugtraq,2347; reference:cve,2001-0144; reference:cve,2001-0572; classtype:shellcode-detect; sid:2101326; rev:7; metadata:created_at 2010_09_23, confidence High, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)