According to security researchers with McAfee, online hackers sell the log-in credentials for online banking accounts for a portion of the available balance.
For a United States bank account with full log-in information, the account is sold for 2 percent of the total balance of money that is in the account. A European Union based account costs 4 to 6 percent of the balance.
Online money payment systems are also sold on cybercrime forums. The log-in details for accounts with PayPal or Moneybookers are sold for 6 to 20 percent of the balance that is in the account.
To launder cash through Western Union, hackers charge 10 percent of the amount to be transferred.
Source (PDF): Raj Samani, Francois Paget, “Cybercrime Exposed: Cybercrime-as-a-service,” McAfee, White Paper, July 2013.