Snort mailing list archives
1337 Bot and TCP options detection
From: joshua burgess <avonyxx () hotmail com>
Date: Wed, 28 Dec 2016 12:51:08 +0000
To check a few boxes, I'm trying to gen up two signatures designed to detect the latest 1337 bot that Imperva wrote about (https://www.incapsula.com/blog/650gbps-ddos-attack-leet-botnet.html) Basically I'm trying to write a signature designed to detect the TCP options which spell out 1337 as well as an abnormally large SYN packet ranging from 799 to 936. I don't know SNORT supports my specifying the TCP options like: Number: No-Operation (NOP) (1) Kind: Window Scale (3) Length: (3) Shift count: (7) Could I do it with"content" only, it doesn't seem likely but I'm running out of ideas... alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"1337 DDoS Tool"; flags:S; content:"Number: No-Operation (NOP) (1)"; content:"Kind: Window Scale (3)"; content:"Length: (3)"; content:"Shift count: (7)"; reference:url,https://www.incapsula.com/blog/650gbps-ddos-attack-leet-botnet.html; classtype:attempted-dos; sid:6000049; rev:1;) As far as writing a signature to look for just the SYN packet size would this work to set two different sizes? alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"1337 DDoS Tool"; flags:S; dsize:>799; dsize:<936; reference:url,https://www.incapsula.com/blog/650gbps-ddos-attack-leet-botnet.html; classtype:attempted-dos; sid:6000049; rev:1;) Any help would be awesome. Thanks! Sent from Outlook<http://aka.ms/weboutlook>
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Current thread:
- 1337 Bot and TCP options detection joshua burgess (Dec 28)
- Re: 1337 Bot and TCP options detection FOULDE Damien (Dec 28)
- Re: 1337 Bot and TCP options detection FOULDE Damien (Dec 28)
- Re: 1337 Bot and TCP options detection joshua burgess (Dec 28)
- Re: 1337 Bot and TCP options detection Y M (Dec 28)
- Re: 1337 Bot and TCP options detection joshua burgess (Dec 28)