Although, as other people have pointed out, this issue has been ongoing for several months the shear lack of feed back or care from Steam is astounding. Clearly not everyone is tech-savvy and many people actually have both the anti-virus software AND malware detection software that Steam actually give as Examples (i.e Avast! and Malwarebytes) and have still been effected by the virus.
Many parents, with the above software to make things safer, allow their kids to play games on Steam and a lot of kids will click on a link a known friend seems to have sent them.
I accidentally got infected and lost several items from my trade bit of steam, but the value was only about $30.00. I raised a ticket several weeks ago and have received only one automated response and none of my items back yet even though I gave all details, screen shots of the 'trade/theft', the steam name of the user that got the items etc.
Looking at the steam forums there are hundreds if not thousands of effected users some whom have lost over $200 worth of items and have had tickets raised with steam for months with no reply. Just the standard automated response!
I also went onto the steam forums to the ideas/suggestions part and suggested they design a 4 digit pin option that the user has to enter for each trade to go through. But one of the admins scoffed at the idea and basically said it was all the victims fault and that people should be more tech-savvy.
I for one AM GLAD that the issue is still making news as it is both a warning to others to be vigilant and also to maybe shame steam into actually doing something about it.
I no longer bother collecting card/badges/wallpapers etc as it seems a waste of time if they can be so easily stolen with no chance of getting them back.