Audit logs containing 28756E6B6E6F776E207573657229

[Gregory Machin <gregory.machin@xxxxxxxxx>]

Hi.
I'm seeing a lot of entries in /var/log/audit/audit.log 
acct=28756E6B6E6F776E207573657229 , which apparently means unknown user .

Sample from the logs :
type=USER_LOGIN msg=audit(1370998250.746:1622709): user pid=16762 uid=0 
auid=4294967295 ses=4294967295 msg='op=login 
acct=28756E6B6E6F776E207573657229 exe="/usr/sbin/sshd" hostname=? 
addr=127.0.0.1 terminal=ssh res=failed'

How do I track down  what is causing this ? Thus far I have has not luck 
using the pid with ps or lsof  as it seems the process has gone by the 
time I respond to the log entries.

Thanks
G

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