Could clicking on an e-mail attachment (a Microsoft Excel file) from a trusted source (work colleague) have installed a tracking virus that would have allowed the sender to obtain browsing history from my computer?
I realise this will raise issues of what I was looking at online and why I feel this may have happened to me. The reason I ask is that I generally would only have used my laptop at weekends generally for online learning etc. Concerns that a work colleague may have been able to access my browsing history arose when conversations at the start of the week were detailed around what I had been looking at online at the weekend - initially minor common themes and then around detailed legislation not specifically related to where I work but that I happened to be looking at that weekend.
Have delayed querying this as I do not wish to appear paranoid but would like to know if this is a possibility and how would I find out for sure?