Definition
Malware is a broad category that includes spyware, ransomware and malicious programs disguised as useful applications. In a crypto context, it may target wallet files, recovery information, authentication sessions or copied destination addresses. A malicious program does not need to attack the blockchain itself if it can compromise the device or account used to interact with it.
How It Works
Infection can follow installation of an untrusted application, opening a harmful attachment or exploitation of an unpatched component. Effects differ: some malware steals information, while other variants encrypt files, replace clipboard contents or display deceptive prompts. A device can be compromised without obvious symptoms, and a familiar icon or apparently working program does not establish safety.
Key Considerations
Use trusted distribution channels, maintain updates and limit unnecessary permissions. Verify transaction details on a trusted display when available rather than relying only on a potentially infected computer. If compromise is suspected, avoid entering fresh secrets on that device and use a known-clean environment for recovery. Security scans can help but a clean scan is not conclusive proof. Backups improve resilience to data loss, yet cannot undo an already authorized transfer or make a stolen private key secret again.