Unawareness is probably one of the top reasons of why hackers succeed in hacking computers. The same thing happened to the Chief Rabbinate office in Israel.
One of the employees used her private Gmail account on the office computer. The employee said that she clicked on a link that was sent to her by an unknown person and then the attacker kidnapped the office computers. The attacker demanded thousands of bitcoins, but the cyber unit of the office declined the demand after they realized that all the data had a backup.
This incident resulted in minor damage to the Chief Rabbinate office, but for others it can end badly with the loss of data and money.
Using private accounts on enterprise computers can be fatal.