In the course of work botnets and bank trojans there is a collecting a large number of passwords.
Usually only registration data from financial services, such as online banking are interesting to malefactors. What to do with other information, not to vanish it. The known researcher in the field of IT safety Brian Krebs learned, how much sell passwords from usual sites, like online stores and social networks. It appears, on them too there is a certain demand. The normal price of such account in the retail market — two dollars. Some accounts from more rare and exotic services can be on sale more expensively, others — are cheaper.
From the computer of the ordinary user it is possible to take one hundred passwords for different sites, some tens from them can be suitable for sale. For example, an account in online store with history of purchases, an account in Facebook with a large number of friends, accounts of delivery services of fedex.com and ups.com (for roguish schemes of the redirection of goods), etc.
Passwords for retail sale can extract from the logs that are going to banking Trojans – they quickly accumulate gigabytes of information from your browsing history, keystrokes, etc. Brian Krebs says that one of the owners sold the boat Andromeda Online 6 gigabytes of logs for $ 150.
After extraction of logins and passwords they are offered for sale, as in usual shop.