Weird dns queries increasing

["Golden Faron P Contr HQ SSG/XOON" <Faron.Golden () Gunter AF mil>]

We have been observing a steadily increasing rate of malformed DNS
packets with predictable characteristics that do not exactly match any
of the current discussions about malformed DNS packets.  The packets are
UDP and destined to port 53 from random high ports and from random
sources to random hosts.  We have seen at least three flavors of
malformed DNS query packets with these characteristics:

Packet 1 (for lack of a better description)
Src:  81.41.208.187             dst: AAA.BBB.239.228  (non-existent
host)
Src port: 53                    dst port: 53
UDP
QR
Opcode          Standard query
AA              Authoritative answer is False
TC              Truncation is False
RD              Recursion desired is False
RA              Recursion available is True
Z               111
RCODE           1110
Number of question records      53380
Number of answer records        16128
Number of Authority records     0
Number of Additional records    0

Packet 2
Src:  216.233.100.27            dst:  AAA.BBB.234.206 (non-existent
host)
Src port:  40385                        dst port: 53
UDP
Opcode          Standard query
AA              Authoritative answer is False
TC              Truncation is False
RD              Recursion desired is False
RA              Recursion available is True
Z               111
RCODE           1110
Number of question records      1155
Number of answer records        16128
Number of Authority records     0
Number of Additional records    0

Packet 3
Src:  66.227.160.128            dst:  AAA.BBB.217.234 (non-existent
host)
Src port: 53                    dst port: 53
UDP
Opcode          Standard query
AA              Authoritative answer is False
TC              Truncation is False
RD              Recursion desired is False
RA              Recursion available is True
Z               111
RCODE           1110
Number of question records      53380
Number of answer records        16166
Number of Authority records     8
Number of Additional records    5082
Question Records
        Question Record 1                       1110

Any ideas?

Faron