![]() “The AES key is then encrypted using the unique RSA public key obtained earlier. ![]() ![]() This key will then be used to encrypt the content of the file using the AES algorithm,” the researchers explained. “For each file matching one of these patterns, the malware will generate a new 256 bit AES key. It’s obvious by the files it targets that the ransomware is interested only in those that are crucial for organizations: Open Office files, Outlook Express, MS Office, Adobe Suite (Photoshop, Illustrator, etc.), AutoCAD, server response files, digital certificate files, digital image files specific to certain camera types, etc. When it succeeds, it sends out information about the system (language, network’s name, etc.) and receives a unique RSA public key that it can then use to encrypt the files to be held for ransom. The ransomware then tries to connect to its C&C server – either on a static, hardcoded domain (which has already been taken down) or by using a domain generation algorithm to create random domains each day. Once installed, the downloader downloads and runs the ransomware, then immediately ensures that it will start automatically every time the computer is rebooted by making changes in the OS’s registry. The Trojan downloader is contained in the attachment, which the employee is asked to open to get more details – and many will, as a good relationship with customers is paramount for any business. A new type of ransomware that obviously concentrates on targeting organizations instead of home users has been spotted by Emsisoft researchers.ĭubbed CryptoLocker, the ransomware is cleverly delivered to employees of various organization via emails purportedly sent by disgruntled customers complaining about a service or product. ![]()
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