Ransomcrypt encrypts files using Tiny Encryption Algorithm (TEA). The key is formed from a "base key" which is modified based on the first character of the name of the file that is being encrypted to form a "file specific key". Both the base key and the file specific key are 16 bytes long.
Our analysts have created a decryption script, written in Python, for our support team. Fortunately, we've only seen a small number of customer cases. The decryption script works with two variants of Ransomcrypt.