Ransomware is only useful to a criminal if they have the ability to decrypt the user's files and the user does not. While Crypter can be used to simulate a real Ransomware attack, steps have been taken to allow users to reverse any damage, and to prevent use by criminals in the wild. But couldn't it be used by criminals for malicious purposes?! While there are plenty of guides and videos on the topic, they usually don't provide the understanding that can be gained by experiencing something first hand.ģ. After completing the initial PoC, I continued working on Crypter for this organisation to provide a customisable Ransomware sample for use use in this environment.Ĭrypter was made publically available to enable security researchers and enthusiasts to gain a better understanding of Ransomware. The training environment made use of live malware samples which were realistic, but unreliable and volatile. At the same time I was working for a security reseller who offered Red vs. As a security researches and Python developer, I set out to determine the extent to which interpretted languages could be used for the creation of malware. Traditionally, malware is written in compiled languages like C and C++. As an experiment and Proof-of-Concept (PoC).Search relevant locations (network drives, user directories, etc.) for matching files.Generate an AES-256 bit encryption/decryption key and write it to key.txt in the current directory.Once executed, Crypter will take the following steps: After setting these options simply hit the BUILD button the build the executable. Some of the options you can set include:Īnd many more. The builder is the application that allows you to customise and build the Crypter Ransomware.
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