What type of malware captures keystrokes from the victim?

The type of malware that captures keystrokes from the victim is known as spyware. Spyware is designed specifically to gather information from a user's computer without their knowledge. This can include capturing keystrokes, which allows the attacker to obtain sensitive information such as passwords, credit card numbers, and other private data.

In contrast, ransomware is malicious software that encrypts the victim's files and demands a ransom for the decryption key, primarily focusing on extortion rather than data collection. Worms are a type of malware that replicate themselves to spread to other devices, often exploiting network vulnerabilities, but they do not typically capture keystrokes. Adware, while it displays unwanted advertisements, does not capture keystrokes and is generally less invasive, focusing more on advertising rather than surveillance.