For its third quarter report, Sophos also noted that five countries in the region have joined the rest of the so-called "Dirty Dozen" list of the top countries that are sources of global spam.

The US remains the top source of spam with 11.3 percent of spam coming from them. But South Korea is now a second with 9.6 percent. Sophos said South Korea jumped up the list five places compared to where it was during the same period last year.

Joining South Korea in the top 12 are India (as a source of 8.8 percent of spam worldwide), Taiwan (at 3.8 percent), Vietnam (3.5 percent) and Indonesia (3.3 percent). India dropped to third place.

Together with the other countries in the continent, Asia was responsible for 50.1 percent of spam released to e-mails worldwide during the period in review compared to only 35.1 percent at the beginning of 2011.