.QIT files are Trojan horse malware files that are used to infect computers and execute malicious program code without the knowledge or consent of the operator. .QITs generally contain executable content that, when executed, will allow hackers to gain full control over a computer. .QIT files are used for various malicious purposes, including keylogging, password theft, spam mailing, and any number of other purposes. QIT trojans may commonly be named or called Backdoor.QIT, though QIT files may may have various filename prefixes.