What is 'phishing'?
As more people use computers for handling financial transactions, from online banking to purchasing or selling goods at eBay, fraudsters have started use cleverly disguised spam to harvest information that allows them to break into online accounts and steal money.
Mails that typically claim to be from Citibank, eBay, PayPal or other banks state that because of some problem the recipient needs to confirm his/her access codes or his/her account will be suspended. Other common tricks are fake payment disputes on eBay purchases, credit card or PayPal debit notices for goods not purchased questions from buyers of goods one is not selling. These surprising emails are supposed to trick people into acting rashly, without thinking.
Some of these emails look almost exactly like the real thing, complete with company logos, etc. Don't fall for it! Citibank, PayPal and other financial institutions never contact their customers supplying a link for re-entering their account numbers, passwords or PIN-codes. Though the links lead to websites that look like official company websites and in some cases even the browser displays a matching URL, these sites are in fact put up by fraudsters and are usually hosted on servers in China or on hacked computers. It is suspected that Russian organized crime groups are the main operators of this type of scam.
Closely related to the phishing scams are parcel remailing scams and "Money Agent" scams. The same gangs that run phishing scams to crack eBay / PayPal / online banking accounts then recruit job seekers using fraudulent job offers from fake companies. The employees are needed to receive and remail merchandise purchased using hacked eBay accounts and for forwarding money stolen from hacked accounts.
Both phishing and employment scams often involve botnets, networks of remote controlled computers running so-called "Trojan horse" software. The criminals controll tens of thousands of these "zombies" and use to send spam, to host fake websites and to attack other websites.
What you can do
Join PhishTank to report phishing websites. This site relies on volunteers to submit phishing reports and to verify submitted reports. The data then feeds into OpenDNS, a system for web users from malicious sites. Feed a phish each day (if any get past your spamfilter!).