Trojan:Win32/Dorifel is a type of Trojan horse malware that infects computers by disguising itself as a legitimate file or program. Once it infiltrates a system, it can steal sensitive information, corrupt files, and allow unauthorized access to the infected computer. Trojan:Win32/Dorifel can spread through email attachments, malicious websites, or infected USB drives. It is important to have up-to-date antivirus software and practice safe browsing habits to prevent infection by this type of malware.