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.
Very similar to the txt.pwserver.com.ua domain!
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=0x03545854 && 0x2c&0xFFDFDFDF=0x08465753 && 0x30&0xDFDFDFDF=0x45525645 && 0x34&0xDFFFDFDF=0x5203434f && 0x38&0xDFFFDFDF=0x4d025541 && 0x3c&0xFF000000=0x00000000" -j DROP -m comment --comment "DROP DNS Q txt.fwserver.com.ua"
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 61 --algo bm --hex-string '|0374787408667773657276657203636f6d02756100|' -j DROP -m comment --comment "DROP DNS Q txt.fwserver.com.ua"
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:
No IP source for this domain
Name server:
;; ANSWER SECTION:
txt.fwserver.com.ua. 28800 IN NS ns1.ua-dc.net.
txt.fwserver.com.ua. 28800 IN NS ns2.ua-dc.net.
;; ADDITIONAL SECTION:
ns1.ua-dc.net. 3600 IN A 91.212.124.5
ns2.ua-dc.net. 3600 IN A 91.214.69.18
Response:
A 242
NS 2
SOA 1
Rsize 3979
Whois
domain: fwserver.com.ua
dom-public: NO
registrant: lklqe46182
admin-c: lklqe46182
tech-c: nic
mnt-by: ua.nic
nserver: ns2.ua-dc.net
nserver: ns1.ua-dc.net
status: ok
created: 2013-07-14 22:33:29+03
expires: 2014-07-14 22:33:29+03
source: UAEPP
% Registrar:
% ==========
registrar: ua.nic
organization: NIC.UA LLC
organization-loc: ТОВ "НІК.ЮЕЙ"
url: http://nic.ua
city: Dnipropetrovsk
country: UA
source: UAEPP
% Registrant:
% ===========
contact-id: lklqe46182
person: n/a
person-loc: not published
e-mail: admin@aden.dp.ua
address: n/a
phone: +380.000000000
mnt-by: ua.nic
status: ok
status: linked
created: 2013-04-06 13:07:34+03
source: UAEPP
% Administrative Contacts:
% =======================
contact-id: lklqe46182
person: n/a
person-loc: not published
e-mail: admin@aden.dp.ua
address: n/a
phone: +380.000000000
mnt-by: ua.nic
status: ok
status: linked
created: 2013-04-06 13:07:34+03
source: UAEPP
% Technical Contacts:
% ===================
contact-id: nic
person: NIC.UA LLC
person-loc: ТОВ "НІК.ЮЕЙ"
organization: NIC.UA LLC
organization-loc: ТОВ "НІК.ЮЕЙ"
e-mail: uanic@nic.ua
address: Plehanova 18 512
address: Dnepropetrovsk
postal-code: 49000
country: UA
address-loc: Плеханова 18 512
address-loc: Днепропетровск
country-loc: UA
phone: +380.442329962
fax: +380.445937569
mnt-by: ua.nic
status: ok
status: linked
created: 2003-01-08 00:00:00+02
modified: 2013-06-22 13:51:58+03
source: UAEPP
This is really useful. A+++++.
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