The payload displays a message informing the user that files have been encrypted, and demands a payment of 400 USD or Euro through an anonymous pre-paid cash voucher (i.e. The process only encrypts data files with certain extensions, including Microsoft Office, OpenDocument, and other documents, pictures, and AutoCAD files. The payload then encrypts files across local hard drives and mapped network drives with the public key, and logs each file encrypted to a registry key. The server may be a local proxy and go through others, frequently relocated in different countries to make tracing them more difficult. It then attempts to contact one of several designated command and control servers once connected, the server generates a 2048-bit RSA key pair, and sends the public key back to the infected computer. When first run, the payload installs itself in the user profile folder, and adds a key to the registry that causes it to run on startup. CryptoLocker was also propagated using the Gameover ZeuS trojan and botnet. A ZIP file attached to an email message contains an executable file with the filename and the icon disguised as a PDF file, taking advantage of Windows' default behaviour of hiding the extension from file names to disguise the real. Other instances of encryption-based ransomware that have followed have used the "CryptoLocker" name (or variations), but are otherwise unrelated.ĬryptoLocker typically propagated as an attachment to a seemingly innocuous e-mail message, which appears to have been sent by a legitimate company. It is believed that the operators of CryptoLocker successfully extorted a total of around $3 million from victims of the trojan. During the operation, a security firm involved in the process obtained the database of private keys used by CryptoLocker, which was in turn used to build an online tool for recovering the keys and files without paying the ransom. Some victims claimed that paying the ransom did not always lead to the files being decrypted.ĬryptoLocker was isolated in late May 2014 via Operation Tovar, which took down the Gameover ZeuS botnet that had been used to distribute the malware. Many said that the ransom should not be paid, but did not offer any way to recover files others said that paying the ransom was the only way to recover files that had not been backed up. There was no guarantee that payment would release the encrypted content.Īlthough CryptoLocker itself was easily removed, the affected files remained encrypted in a way which researchers considered unfeasible to break. If the deadline was not met, the malware offered to decrypt data via an online service provided by the malware's operators, for a significantly higher price in bitcoin. The malware then displayed a message which offered to decrypt the data if a payment (through either bitcoin or a pre-paid cash voucher) was made by a stated deadline, and it threatened to delete the private key if the deadline passes. When activated, the malware encrypted certain types of files stored on local and mounted network drives using RSA public-key cryptography, with the private key stored only on the malware's control servers. It propagated via infected email attachments, and via an existing Gameover ZeuS botnet. The attack utilized a trojan that targeted computers running Microsoft Windows, and was believed to have first been posted to the Internet on 5 September 2013. The CryptoLocker ransomware attack was a cyberattack using the CryptoLocker ransomware that occurred from 5 September 2013 to late May 2014. For other similar software, some using the CryptoLocker name, see Ransomware § Encrypting ransomware. Refresh_pattern (Release|Packages(.gz)*)$ 0 20% 2880Ĭache_peer 10.1.2.This article is about specific ransomware software called CryptoLocker. Please provide authenticated proxy ip only ( in our example : 10.1.2.3 - not domain one ) http_access allow all Install local proxy, e.g : squid for windowsĪfter installing, open nf file ( right mouse click on squid icon on task bar -> Open Squid Configuration Setting Proxy Authentication via Squid Proxy In addition to : answer above, another option :
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