In Dell's words, 'During this payment validation phase, the malware connects to the C2 server every fifteen minutes to determine if the payment has been accepted. Upon submitting payment, victims' computers no longer show the threatening countdown screen and instead see a new payment activation window. When all files have been encrypted, each victim is then presented with an ugly splash screen with an ominous countdown timer, demanding payment.

(.) Instead of using a custom cryptographic implementation like many other malware families, CryptoLocker uses strong third-party certified cryptography offered by Microsoft's CryptoAPI.īy using a sound implementation and following best practices, the malware authors have created a robust program that is difficult to circumvent.ĭell's paper suggests CryptoLocker's puppetmasters are in Russia and Eastern Europe, with primary targets in the United States, as well as other English-speaking countries.

This communication provides the malware with the threat actors' RSA public key, which is used throughout the encryption process. The encryption process begins after CryptoLocker has established its presence on the system and successfully located, connected to, and communicated with an attacker-controlled C2 server. Then, your files are swiftly and silently owned.

CryptoLocker then deletes the original executable file. When first executed, the malware creates a copy of itself in either %AppData% or %LocalAppData%. Prior to these actions, the malware ensures that it remains running on infected systems and that it persists across reboots.

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