How to find out how a computer acquired a virus

My wife has a very new iMac 21.5. Today she swarmed three times: twice with the DrodZp-A malware and once with the horse of Trojan DocDl-LAO.

I checked her email, she received no e-mail on or all the time, Sophos detected the virus. I even recorded in gmail directly for watch emails on the server. I looked at the history of his browser. Yet once, nothing suggests that she has picked up a virus by watching a Flash movie.

How can I determine how it got infested with his computer? I don't seem to be able to correlate the time stamp in a meaningful way. I looked at the system logs, and again nothing seems out of place.

Ideally, I would like to be able to isolate the incident which is the cause so I can tell him, "don't do that".

Most likely it is Sophos issuing false positives.

Since the first is a Phishing attempt, it could be spam. It also has no effect on a Mac.

The second is also a threat to Windows, completely benign on your Mac.

Tags: Mac OS & System Software

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