TeslaCrypt and Alpha Crypt are file-encrypting ransomware programs that target Windows XP, Windows Vista, Windows 7, and Windows 8. The ransom cost starts at around $500 USD and is payable via bitcoins. Depending on the version of TeslaCrypt you were infected with, it may be possible to use the TeslaDecoder tool to decrypt your files for free. The current list of extensions used by TeslaCrypt is: ecc,.ezz,.exx,.xyz,.zzz,.aaa,.abc,.ccc, and one version did not change your file extension at all.
Source: https://www.bleepingcomputer.com/virus-removal/teslacrypt-alphacrypt-ransomware-information