The report by security firm Symantec found that cyber criminals are targeting home PC owners because they are the easiest to catch out.
Internet crime to hit homes hard from the BBC Technology News
Analysis of the net addresses where the e-mail messages originated showed that more than 100,000 hijacked home computers spread across 119 nations had been used to despatch the junk mail.
Spam trail uncovers junk empire from BBC Technology News
Criminals are increasingly trying to trick citizens into giving them their bank account details, according to a survey published on Monday that showed such phishing attempts almost doubled in the first six months.
Online criminals step up phishing scams from C|Net