This is the first time you noticed you caught a malware. I wouldn't be so confident about never having caught one and Im way more paranoid than you. This one was just really noisy.
I totally never accidentally fell for the spam awareness email at Monday at 8am before my caffeine to hangover ratio was balanced while being the admin.
Was it an actual zip file that managed to exploit some vulnerability in the program that opened it or was it something like "filename.zip.exe" and windows hid the .exe part?