1. Unexpected pop-ups or redirects
Persistent pop-ups, browser redirects or a changed search engine can indicate unwanted software or a malicious extension. Review recently installed apps and extensions and run a trusted security scan.
2. Security tools are disabled without explanation
Malware sometimes attempts to interfere with updates or protection. If security settings change unexpectedly, reconnect through a trusted network, update the system and use the operating system or reputable security vendor's recovery guidance.
3. Unexplained account or network activity
Login alerts, messages you did not send, unfamiliar sessions or abnormal data use can indicate account compromise, malicious apps or another configuration issue. Change passwords from a known-clean device when compromise is plausible.
4. New apps, extensions or permissions you do not recognize
Review installed applications and high-risk permissions such as accessibility, device administration, browser extensions, microphone, camera and notification access. Remove items only when you can identify them safely.
5. Performance changes that come with other signals
Battery drain, heat or slowness can have harmless causes such as updates or aging hardware. They become more meaningful when paired with unknown processes, redirects, security warnings or unauthorized account activity.
