Website malware can arrive through vulnerable software, stolen credentials, insecure uploads or compromised administrator devices. Symptoms may include redirects, spam pages, unfamiliar files, new users or unexpected search results.
What to consider
Cleanup should identify the entry point, remove malicious changes, update vulnerable components and rotate relevant credentials. Restoring a clean backup can help, but only if the underlying weakness is also fixed.
Prevention combines patching, least-privilege access, secure hosting, malware monitoring, backups and strong administrator authentication.