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.
IPtables:
There are two iptable rules available. If your distribution supports Iptables 'u32' module pick this one, otherwise use the 'string' rule.
U32:
iptables --insert INPUT -p udp --dport 53 -m u32 --u32 "0x28&0xFFDFDFDF=0x044c4f4f && 0x2c&0xFFFFDFDF=0x31025255 && 0x30&0xFF000000=0x00000000" -j DROP -m comment --comment "DROP DNS Q loo1.ru"
More U32 rules can be found here:
https://github.com/smurfmonitor/dns-iptables-rules/blob/master/domain-blacklist.txt
String:
iptables --insert INPUT -p udp --dport 53 -m string --from 40 --to 49 --algo bm --hex-string '|046c6f6f3102727500|' -j DROP -m comment --comment "DROP DNS Q loo1.ru"
More Iptables rules for the STRING module can be found here:
https://github.com/smurfmonitor/dns-iptables-rules/blob/master/domain-blacklist-string.txt
Source:
93.174.93.217 - Ecatel
Name server:
;; ANSWER SECTION:
loo1.ru. 21600 IN NS ns1.reg.ru.
loo1.ru. 21600 IN NS ns2.reg.ru.
Response:
A 231
NS 2
SOA 1
Rsize 3792
Whois
domain: LOO1.RU
nserver: ns1.reg.ru.
nserver: ns2.reg.ru.
state: REGISTERED, DELEGATED, UNVERIFIED
person: Private Person
registrar: REGRU-REG-RIPN
admin-contact: http://www.reg.ru/whois/admin_contact
created: 2013.10.17
paid-till: 2014.10.17
free-date: 2014.11.17
source: TCI
Last updated on 2013.11.08 01:41:36 MSK
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