IPA: /ˈmæl.wɛər/
KK: /ˈmælˌwɛr/
Software that is created to harm or disrupt computers and networks, often stealing personal information or causing damage.
The company installed antivirus software to protect against malware attacks.
Malware is formed from "mal-" (meaning bad) and "ware" (from Old English "waru", meaning goods or products). The word refers to bad software designed to harm or exploit computer systems.
Think of 'mal-' meaning bad, and 'ware' referring to goods — malware is bad goods in the form of software.