TeslaCrypt (a.k.a. EccKrypt) is one of the most recent ransomware variants we’ve seen widely that encrypts certain user files and demands a ransom be paid to decrypt the files. Similar to other variants, it uses an AES symmetric algorithm to encrypt files.
TeslaCrypt is distributed widely via the Angler exploit kit and a few other known exploit kits. Using Angler, it exploits Adobe Flash (CVE-2015-0311) and, once successfully exploited, it downloads TeslaCrypt as a payload.