The "Еј" character suggests a character encoding mismatch, typical of automated spam tools targeting different regions.
If you have received an email with the subject (often a corrupted rendering of "ważne.zip" , which means "important" in Polish), do not open the attachment. This is a known hallmark of phishing campaigns used to deliver malware such as Trojans or ransomware. waЕјn.zip
Immediately turn off your Wi-Fi or unplug your ethernet cable to prevent the malware from communicating with its "command and control" server. The "Еј" character suggests a character encoding mismatch,
Use reputable security software like Malwarebytes or built-in tools like Windows Security to perform a deep system scan. which means "important" in Polish)