[Snort-sigs] I need a rule for synk4.c attack
dayioglu at ...508...
Wed Apr 10 08:33:10 EDT 2002
For the below packet, the rule you have hacked up from 241/2 is correct.
It works for me here.
I checked the source for an alternative signature but it seems that the
TCP seq is the only
Ali BASEL wrote:
> How can I write a snort (snort 1.8.6) rule for the synk4.c syn flood
> (with spoofed IP) attack program ?
> Here is the tcpdump of the attack:(destination port 80 supplied as an
> cat TCP\:1368-80
> 04/09-17:05:43.860348 10.10.10.10:1368 -> 10.15.0.27:80
> TCP TTL:30 TOS:0x0 ID:29579 IpLen:20 DgmLen:40
> 1*****S* Seq: 0x28376839 Ack: 0x0 Win: 0xFFFF TcpLen: 20
> I have tried the above rule to detect the attack, but It doesn't
> recognize it (I have changed the sequence number of the original rule)
> alert tcp $HOME_NET any <> $EXTERNAL_NET any (msg:"DDOS shaft
> synflood"; flags: S; seq: 674719801; reference:arachnids,253;
> classtype:attempted-dos; sid:241; rev:2;)
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