![]() ![]() In doing so, they trick users into manual download/installation of malware. Peer-to-Peer (P2P) networks, freeware download/free file hosting sites, and other unofficial software download sources are also used in a similar manner.Ĭriminals present malicious executables as legitimate software. To give the impression of legitimacy and increase the chance of tricking recipients, criminals usually present attachments as various important documents, such as receipts, invoices, bills, and similar. ![]() Trojans are malicious lightweight applications designed to stealthily infiltrate systems and inject them with additional malware.Ĭriminals employ spam campaigns to send hundreds of thousands of deceptive emails containing malicious attachments (links/files) and messages encouraging recipients to open them. The same applies to fake cracks, which infect computers rather than enabling access to paid software features. Fake software updaters usually infect systems by exploiting outdated software bugs/flaws. The exact way developers proliferate Sguard is currently unknown, however, ransomware-type infections are often distributed using fake software updaters and 'cracks', trojans, spam emails, and unofficial software download sources. In fact, have multiple backup copies stored in different locations, as there is always a chance that servers/storage devices can be damaged. Ransomware presents a strong case for maintaining regular backups, however, store them on a remote server or unplugged storage device, since ransomware will compromise locally stored backups with regular data. The only possible scenarios are ransomware being still in development and/or having certain bugs/flaws. Thus, it is virtually impossible to restore data without developers' involvement. Although the developers are different, all of these infections have virtually identical behavior - they encrypt data and make ransom demands.Įncryptions are performed using cryptographies that generate unique decryption keys. Sguard is virtually identical to hundreds of other ransomware infections such as Viagra, NEMTY PROJECT, and Grethen. The only solution is to restore everything from a backup, if one has been created. Unfortunately, there are no tools capable of cracking the RSA algorithm and restoring data free of charge. ![]() Thus, paying is likely to deliver no positive result and you will be scammed. Even if you can afford to pay, however, do not be tempted.Ĭyber criminals often ignore victims, once payments are submitted. Each key has an equivalent cost of €600 and payment must be submitted using the Bitcoin cryptocurrency. ![]() Criminals hide all keys on a remote server and blackmail victims for their release. Restoring data without the private key is impossible. RSA is an asymmetric encryption and, thus, two unique keys (public and private ) are generated individually for each victim. The ransom-demand message states that files are encrypted using the RSA encryption algorithm and that victims must purchase a decryption key to restore them. Screenshot of files encrypted by Sguard ransomware: Copies of this file are stored in most existing folders. A text file (" SGUARD-README.TXT") containing a ransom-demand message is then created. sguard" extension (e.g., " sample.jpg" is renamed to " "). Sguard also appends the names of encrypted file with the ". Sguard is designed to stealthily infiltrate computers and encrypt data so that developers can make ransom demands by offering paid recovery of files. Sguard is yet another high-risk ransomware infection discovered by Michael Gillespie. ![]()
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