To establish a botnet, attackers employ eccouncil video

Full Certification Question

To establish a botnet, attackers employ various techniques for scanning vulnerable machines. The initial step involves gathering information about a considerable number of vulnerable machines to compile a comprehensive list. Following this, the attackers infect the identified machines. The list is then divided, with half assigned to the newly compromised machines. Simultaneously, the scanning process is executed. This technique facilitates rapid spreading and installation of malicious code. Which technique is described in the scenario?