... on site," Kempf explains. 58 percent of the companies attacked say that the disruptions were caused by their own or external employees. "As a rule, internal perpetrators are very familiar with the conditions in the companies and steal specific data records or infiltrate malware into the IT systems," says Kempf. In addition, almost a third of companies report that their IT systems have been attacked via the internet. These include denial-of-service attacks or targeted intrusions into IT systems via the Internet.