Spam Might Be Coming From YOUR Machine

By Deane Barker on June 6, 2004

Zombie PCs spew out 80% of spam: Turns out spam is coming from places other than you might think. It’s tempting to envision spam coming from some centralized location so we can all sit around and complain that they don’t shut the loser off, but the reality appears to be different.

Four-fifths of spam now emanates from computers contaminated with Trojan horse infections, according to a study by network management firm Sandvine out this week. Trojans and worms with backdoor components such as Migmaf and SoBig have turned infected Windows PCs into drones in vast networks of compromised zombie PCs. […]

Sandvine’s analysis, cross referenced with data from SORBS, to determine what IP space is assigned to residential subscriber pools of global service providers, shows most spam now originating from residential broadband networks.