need help interpreting ausearch results

[Stefano Schiavi]

Hello,

Thank you Steve and all for keeping up the great work here.

Some time ago I setup some audit rules to monitor what would change the 
permissions of the public_html directory since we found that once in a 
while it would change to 777 out of the blue.

It happened again yesterday and I believe these parts of the log 
represent when the issue happened:

type=PATH msg=audit(1386933561.795:7958476): item=2 name="./www" 
inode=4980752 dev=08:08 mode=0120777 ouid=501 ogid=501 rdev=00:00
type=PATH msg=audit(1386933561.795:7958476): item=1 name="./" 
inode=4980737 dev=08:08 mode=040711 ouid=501 ogid=501 rdev=00:00
type=PATH msg=audit(1386933561.795:7958476): item=0 name="public_html"
type=CWD msg=audit(1386933561.795:7958476):  cwd="/home/lanogbar"
type=SYSCALL msg=audit(1386933561.795:7958476): arch=c000003e syscall=88 
success=yes exit=0 a0=1306d160 a1=1306d200 a2=11 a3=0 items=3 ppid=18728 
pid=18731 auid=0 uid=501 gid=501 euid=501 suid=501 fsuid=501 egid=501 
sgid=501 fsgid=501 tty=(none) ses=117304 comm="gtar" exe="/bin/tar" 
key="lanogbar-www"


This is just a guess though and I can not be sure as I have no 
experience parsing the logs. Looking through with the I flag we can see 
the following::

type=PATH msg=audit(12/13/2013 15:00:03.759:7970202) : item=0 
name=/home/lanogbar/public_html/ inode=4980744 dev=08:08 mode=dir,750 
ouid=lanogbar ogid=nobody rdev=00:00
type=CWD msg=audit(12/13/2013 15:00:03.759:7970202) : 
cwd=/home/lanogbar/public_html
type=SYSCALL msg=audit(12/13/2013 15:00:03.759:7970202) : arch=x86_64 
syscall=chmod success=yes exit=0 a0=1585e520 a1=1ff a2=2f a3=146c1d40 
items=1 ppid=27717 pid=8804 auid=root uid=lanogbar gid=lanogbar 
euid=lanogbar suid=lanogbar fsuid=lanogbar egid=lanogbar sgid=lanogbar 
fsgid=lanogbar tty=(none) ses=117304 comm=php exe=/usr/bin/php 
key=lanogbar-public_html

Do you think this is relevant?
If so it would seem a php script was responsible.

Would you have any suggestion on how to identify the script?

Thank you very much for the very valuable help.
Kind regards,
Stefano