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Mac OS X / Unix / networking Expert advice sought, possible malware operating on work laptops

I would appreciate hearing a specific, step-by-step process by which one can determine with confidence if a Mac OS X machine has been compromised, in particular by phishing, keystroke logging, or related practices.

Please reply without concern for lay understanding.  I truly want an expert second opinion on this matter. I have programmers and network professionals who work for me, and who can implement as complicated a plan/solution as you might devise. This site is being used for that expert second opinion, for possible "thinking outside the box".

(Hence, no answers questioning reasons for the making the query, suggesting reinstallation of system software, or simply encouraging installation of Little Snitch or similar monitoring, are desired. Monitoring toward a specific end, as a step in a plan is welcome; sledge hammer solutions and monitoring activities as open-ended exploratory activities are unhelpful.)

Thank you in advance for your effort on this.  Prof D
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LeProf_No1
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LeProf_No1
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Kash2nd Line EngineerCommented:
Hello,
 what kind of possible malware you suspect is running on your network. If you think a machine has been compromised you can check on ACTIVITY MONITOR to see if any suspect program is running in the background. that is the first check you can do.

you can also check for open ports on machine if you think any ports are open which shouldn't be.

the firewall (built in) on the mac is very strong and if you turn it on, it will definitely block most of the programs and will raise alarm if some malicious activity occurs.

again, my answers are very generic as I am not sure what kind of info you are after but we can work towards it.
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LeProf_No1Author Commented:
We did *not* accept this Comment as a solution, though the individual clearly made an attempt to assist us.

What was desired was a process to follow, in IT language, to unequivocally determine if a Mac OS X machine has been compromised, see original request (or to be told such was not possible, see comment offered on replying "No" to "Was this Comment Helpful?" query).

Specifically, Activity Monitor (AM) and equivalent unix procs are already in use, but clarification is needed as to what evidence is sought. Open ports was a helpful step/point, with the same limitation as the AM recommendation. The Mac firewall rec, while largely sound as a preventative, here would be closing the barn door after...

As "innocent" said, the answers, while well-meaning and appreciated -- especially as the ONLY answer offered by this expert service -- were too generic to be of help.
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LeProf_No1Author Commented:
We have discontinued use of this service, less than expert in this crucial area, and will use other means to arrive at the process we need.  LeProf_No1
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