You have a rural dial-up customer who complains that a large number of phone calls have been made to “dangerous” sites on the Internet from his computer but he didn’t make these calls. You investigate his computer and discover what type of malware? A. Adware B. Dialer C. Keystroke logger D. Spim Solution B. Dialers are types of malicious programs installed on computers that cause the dialup modem to call dangerous or pay-per-call locations on the Internet, often resulting in extremely high phone bills for the customer..