Malware refers to a variety of malicious software that can infect a computer operating system and cause damage to the system or steal personal information. Types of malware include computer viruses, worms, Trojan horses, ransomware, spyware, and adware. Malware often enters the system through users unknowingly executing malicious software.
All data, your private keys, your two-factor authentication secrets and password manager data stored on your Trezor device are safe from being accessed by malicious software, as no data ever leaves the Trezor device. However, certain types of malware attempt to replace the recipient addresses with the attacker's address prior to the signing of a transaction by the Trezor device. Therefore, it is important to always double-check that the data displayed on the Trezor screen is correct.