How spammers identify their targets
A Slashdot blogja mutatott rá Brent Huston, security.itworld.com igen lényeges cikkére.
Ebben tapasztalatai alapján részletezi a spammerek 4 fő technikáját:
- The first, and least common, is spammers that obtain temporary legal and real accounts with ISPs.
- The second method used to send spam is through compromised hosts, usually workstations and home computers on high-speed connections such as DSL or cable modems.
- The third way spam is spread is using web forms.
- The last, and most common method that spammers use is via open relays.
A következtetése is érdekes:
From this process I learned that they were doing much more server analysis than I expected before they dump their spam. I also learned that they do a multi-step approach. They scan the server for proper RFC compliance, and then they send a test message to a disposable address. Only after these are complete did they adopt the tool to dump their spam. This is much more cautious than I expected them to be.