According to BleepingComputer, the Radamant Ransomware Kit has been for sale on private exploit and malware sites since December 7th 2015.

Hackers can rent the kit for one month for $1,000 or take a demo for 48 hours for $100. What you get for the money is a complete payment system, administrative console, statistics, the ability to modify extensions that will be encrypted, and technical support on getting the ransomware kit up and running.

It is up to the individual hacker as to the means to distribute the malware.

Below are some of the advertised features of the Radamant Ransomware Kit:

Radamant Ransomware Kit
Good day, dear masters!
Today I would like to introduce you to a new and flexible solution for converting your downloads.
To begin, consider the technical aspects of the software: The client side

Written in C ++;
Weight 70 kb;
Encrypt all data carriers (HDD, USB-flash and Shared folder);
Encrypting files masks to 1607 (with the possibility of real-time change)
AES-256 (32-character key for each file) with encryption key RSA-2048
If you interrupt the encryption (shutdown / restart) starts encryption of a place to stay;
When you restart the computer looks for new files for encryption;
Working under a user account;
Privilege escalation through social engineering (WMI);
Removing the shadow copies of files and restore points Windows;
Samoudalenie after decryption;

Rental
software is distributed only in this way and no more.
It works for all countries. No restrictions.
Term of lease - 1 month
rental price: 1k $
possible test period - 48 hours ($ 100)

Selling malware on underground sites is not new. We can expect more to come as ransomware has proven to be a large money generator.

Source: BleepingComputer