Malware
An artificial word made up of "malicious" and "software" for software that performs undesirable and usually harmful functions. Whether you have already become a victim yourself and whether private information can be found on the net can be checked by these (reputable) institutes:
https://haveibeenpwned.com/
https://sec.hpi.de/ilc/
https://breachalarm.com/
https://monitor.firefox.com/
(VSS, DGA, Dual Use, IT Forensics, Man in the Middle, RCE, Trojaner, Virus, Worm)