Tuesday, December 17, 2013

Domain: grungyman.cloudns.org

Domain: grungyman.cloudns.org

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=0x09475255 && 0x2c&0xDFDFDFDF=0x4e47594d && 0x30&0xDFDFFFDF=0x414e0743 && 0x34&0xDFDFDFDF=0x4c4f5544 && 0x38&0xDFDFFFDF=0x4e53034f && 0x3c&0xDFDFFF00=0x52470000" -j DROP -m comment --comment "DROP DNS Q grungyman.cloudns.org"

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 63 --algo bm --hex-string '|096772756e67796d616e07636c6f75646e73036f726700|' -j DROP -m comment --comment "DROP DNS Q grungyman.cloudns.org"
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:
grungyman.cloudns.org. 3599 IN NS ns3.cloudns.net.
grungyman.cloudns.org. 3599 IN NS ns4.cloudns.net.
grungyman.cloudns.org. 3599 IN NS ns1.cloudns.net.
grungyman.cloudns.org. 3599 IN NS ns2.cloudns.net.


Response:


A 201
NS 4
SOA 1
Rsize 3366


Whois


NOT FOUND



2 comments:

  1. Another "amencredit.cloudns.in" attack. Please add db.

    Eric

    ReplyDelete