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We have a MacBook on our LAN making strange DNS requests for non-existant host-names:

(Windows Server DNS log extract shown)

20131127 09:07:18 A28 PACKET  02A34A10 UDP Rcv 192.168.30.47   e40d   Q [0001   D   NOERROR] A     (10)aqhnbkfscc(9)ourdomain(3)com(0)
20131127 09:07:18 A28 PACKET  02B79EF0 UDP Rcv 192.168.30.47   ddd4   Q [0001   D   NOERROR] A     (10)xoslqfsqsh(9)ourdomain(3)com(0)
20131127 09:07:18 94C PACKET  02A34A10 UDP Snd 192.168.30.47   e40d R Q [8385 A DR NXDOMAIN] A     (10)aqhnbkfscc(9)ourdomain(3)com(0)
20131127 09:07:18 A28 PACKET  02B57DE0 UDP Rcv 192.168.30.47   1437   Q [0001   D   NOERROR] A     (10)fzvnvilkwv(9)ourdomain(3)com(0)
20131127 09:07:18 94C PACKET  02B79EF0 UDP Snd 192.168.30.47   ddd4 R Q [8385 A DR NXDOMAIN] A     (10)xoslqfsqsh(9)ourdomain(3)com(0)
20131127 09:07:18 94C PACKET  02B57DE0 UDP Snd 192.168.30.47   1437 R Q [8385 A DR NXDOMAIN] A     (10)fzvnvilkwv(9)ourdomain(3)com(0)

Any idea what would cause this? Malware?

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