alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET SHELLCODE Possible Call with No Offset TCP Shellcode"; flow:established; content:"|E8 00 00 00 00 0F 1A|"; fast_pattern:only; reference:url,www.networkforensics.com/2010/05/16/network-detection-of-x86-buffer-overflow-shellcode/; classtype:shellcode-detect; sid:2012090; rev:1;)

Added 2011-10-12 19:33:26 UTC

False positives on SSL/VPN traffic. Suddgested replace:

alert tcp $EXTERNAL_NET any -> $HOME_NET SSH_PORTS (msg:"ET SHELLCODE Possible Call with No Offset TCP Shellcode"; flow:established; content:"|E8 00 00 00 00 0F 1A|"; fast_pattern:only; reference:url,www.networkforensics.com/2010/05/16/network-detection-of-x86-buffer-overflow-shellcode/; classtype:shellcode-detect; sid:2012090; rev:2;)

-- VladimirAnufriev - 14 Oct 2011

!$SSH_PORTS, obviously

-- VladimirAnufriev - 14 Oct 2011


alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET SHELLCODE Possible Call with No Offset TCP Shellcode"; flow:established; content:"|E8 00 00 00 00 0F 1A|"; fast_pattern:only; classtype:shellcode-detect; reference:url,www.networkforensics.com/2010/05/16/network-detection-of-x86-buffer-overflow-shellcode/; sid:2012090; rev:1;)

Added 2011-02-04 17:31:57 UTC


Topic revision: r2 - 2011-10-14 - VladimirAnufriev
 
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