Attack using a legit domain. Have not seen any attacks yet. Only scanning.
If you are seeing queries for this domain, than you are likely participating in DNS Amplification attacks and your DNS server is probably reachable from the internet and has recursion enabled.
If you are seeing responses for this domain.. unlucky. You are currently beeing DDOS-ed! Good luck.
There are two iptable rules available. If your distribution supports Iptables 'u32' module pick this one, otherwise use the 'string' rule.
iptables --insert INPUT -p udp --dport 53 -m u32 --u32 "0x28&0xFFDFDFDF=0x09484343 && 0x2c&0xDFDFDFDF=0x464f5255 && 0x30&0xDFDFFFDF=0x4d53024e && 0x34&0xDFFF00FF=0x4c0000ff" -j DROP -m comment --comment "DROP DNS Q ANY hccforums.nl"
More U32 rules can be found here:
iptables --insert INPUT -p udp --dport 53 -m string --from 40 --to 56 --algo bm --hex-string '|09686363666f72756d73026e6c0000ff|' -j DROP -m comment --comment "DROP DNS Q hccforums.nl"
More Iptables rules for the STRING module can be found here:
18.104.22.168 - AS29073 Ecatel Network
;; ANSWER SECTION:
hccforums.nl. 3600 IN NS ns1.hobby.nl.
hccforums.nl. 3600 IN NS ns2.hobby.nl.
hccforums.nl. 3600 IN NS ns3.hobby.nl.
Domain name: hccforums.nl
Record maintained by: NL Domain Registry
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