In either case, it is highly recommended that administrator passwords are reset. When the Administrator password appears to have been used, you should assume that it has either been guessed or stolen. Even when the Administrator password is not known, the password may be brute forced if the RDP port is open to the public and your current security policy allows this. Many hackers are successful at abusing open RDP ports. Below is some information about areas you can check in order to harden against/investigate the attack. Identifying the source will be important because as you move forward, your primary concern should be a second attack rather than the same infection persisting. Identifying the infection may also allow you to identify potential sources of the attack. To get our free ransomware decryption tools, see this Avast page. As a general practice in the security community, any decryption tools that have been developed are usually shared by the developer for free. Once identified, you may know what common locations any remaining infection may occupy, the scope of the attack, and whether or not a decryption tool exists that would allow you to recover your files. For this reason, the best start when cleaning infected devices is to identify the ransomware variant that attacked your devices. However, sometimes secondary malware is installed to attack the system again or allow further breaches. Removing ransomware is usually not required because most ransomware often delete themselves after executing (running). Our virus lab is unable to decrypt any encrypted files affected by ransomware, nor do these encrypted files contain any useful data to add to our virus definitions. Immediately disconnect ransomware-infected devices physically from the network to prevent other devices in your network from getting infected. The best protection against this type of malware is to keep separate backups in a location not on your main network. Even after paying the ransom, there is no guarantee that you can recover your files. Ransomware refers to malicious software that encrypts important files on a device and then threatens to publish the victim's data or perpetually block access to it unless a ransom is paid.
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