This scenario describes a phishing attack, which is a form of social engineering where attackers masquerade as a trustworthy entity in an email to distribute malicious links or gather sensitive information like login credentials. The described situation fits the classic pattern of a phishing attempt through email, exploiting the credibility of 'system maintenance' to deceive employees into providing their information. It is not a vishing attack because that involves using phone calls to obtain confidential information. Smishing attacks involve the use of SMS texts, not emails. While typosquatting could be used in conjunction with phishing, it specifically involves registering domains that are slight misspellings of legitimate company domains and there is no mention of this detail in the scenario.