Fortunately, Bit Defender blocked the virus at first contact. My computers do an antivirus update every two hours, and I am usually* very careful. I started a deep analysis (took a bit less than 2 hours) immediately after the event, and appart few cookies, there was nothing unexpected in my machine.
*I say usually, because this time I felt in the trap because I was working on something about London. So I thought that the message could really have some relation ship with my recent work...
Bad luck,
But good lesson !