MG2009,
In case the following might give you peace of mind . . . .
I used information from -
How to remove the Flashback malware from OS X - under the section "How do I detect it?" - to see what Terminal reported for my Mac OS X 10.6.8 system.
I copied and pasted the three lines from the above link and section which began with
defaults read
into Terminal and pressed enter.
Three results stating "does not exist" were returned.
Then I did the same for
ls -la ~/../Shared/.*.so
"No such file or directory" was returned.
As far as I know, my system has all of the available updates installed.