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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>We have recently noticed a deluge of DNS requests for “ANY
ANY” records of x.p.ctrc.cc. The requests are coming from thousands of
sources, mostly our own customers. There are currently no records for x.p.ctrc.cc,
or even for p.ctrc.cc. A google search for x.p.ctrc.cc comes up with only 2
hits. One is a DNS log showing references to this name. The other one shows
that somebody else is seeing the same behavior as we are:</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><a
href="http://weblog.barnet.com.au/edwin/cat_networking.html">http://weblog.barnet.com.au/edwin/cat_networking.html</a></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>However, this site has the benefit or providing a history
that p.ctrc.cc had (a week ago) delegated NS record pointing to 321blowjob.com.
At that time, 321blowjob.com’s nameserver was responding with a TXT
record for x.p.ctrc.cc.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>It would appear that ctrc.cc was the victim of some DNS
hijacking. Whatever malware is attempting to lookup this name, however, is
doing so at a horrific rate. I have some addresses that have made >250000
requests for this name in a short period of time.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I was thinking that I could simply put an authoritative zone
for p.ctrc.cc in our nameservers and return something for the lookups, however
based on the writeup on the above mentions blog, I am now not certain this will
have any effect. As you’ll note, that individual had only 2 machines
hitting his name server, and even though a response was provided to the lookup,
the hosts continued to hammer his access link.</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>When the lookup flood occurs, every host starts at the same
time, as can be seen on the graphs of traffic to and load of our nameservers. It’s
all or nothing – the flood is either on or off. There’s no
background trickle.</span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Is anybody else seeing these events?</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>--Paul</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
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