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Good morning, today the company I work for has suffered a cyber attack, all windows 7 and 10 operating systems servers and computers have been affected by the LECHIFFRE ransomware. Servers no longer respond to commands, we can't even take them remotely. Customers have practically all disk encrypted and applications do not work. We used several antivirus and antimalware products but no one found the virus on client workstations. We tried to run the tool you developed in 2016 but it did not recognize any of the encrypted files.  We are talking about 700 computers between desktops, clients and servers.

Help Me

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Can you ZIP some of the encrypted files, and attach them to a reply or a private message for us to review?

Also note that since this is a business request, if you need more in-depth support than I normally give on our forums or help with a ransomware we don't make a decrypter for, we do have a paid ransomware remediation service (decryption is not guaranteed, but you will get support from our best ransomware experts):
https://www.emsisoft.com/en/tools/ransomware-recovery/inquire/

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On 7/12/2020 at 2:09 AM, enomis78 said:

Thanks for your help.  I have already written to your support, but they need the key to develop a decryption tool

Unfortunately that's the case with the majority of ransomware infections these days.

Just in case this infection was due to RDP (Remote Desktop) compromise, I'll paste some steps below for getting started trying to prevent future intrusions.

First I recommend temporarily disabling all port rules in your firewall (closing all open ports) until you can do a full audit of your firewall configuration and determine which ports need to remain open. There are some basic recommendations below to help get you started with the port audit.

If you are managing a company network, then some form of IPS/IDS is highly recommended to monitor the network for intrusions. If you already have such a system in place, then I recommend a full audit of any rules you have configured to make sure that the device is providing adequate monitoring. It is also recommended to have someone with penetration testing experience verify that the IPS/IDS is properly alerting when there are intrusion attempts.

Also, quickly change all passwords on any workstations and/or servers that are connected to the same network as the compromised system. Also be sure to change passwords on any online accounts, as well as any routers or switches (or other devices that have network-accessible administration functions).

I recommend that every account have a different password, that passwords be no shorter than 25 characters and be made up of a random combination of uppercase letters, lowercase letters, numbers, and symbols. Obviously passwords like that are difficult (if not impossible) to remember, so a password manager may be required in order to aid in managing passwords. KeePass is probably the simplest password manager, and stores password databases locally instead of on some "cloud" server. If something capable of automatically filling in passwords (or sharing passwords between multiple devices/users) is necessary then there are reasonable passwords managers from LastPass, bitwarden, 1Password, Dashlane, etc. Note that unlike KeePass, these password managers work as extensions added to web browsers (or apps on mobile phones), and they store password databases online.

When auditing your firewall configuration and preparing to reopen ports, I recommend never opening ports globally unless absolutely necessary. I also recommend requiring anyone who needs access to sensitive services (RDP, Windows Networking, etc) to connect to the network via a VPN so that you don't have to open ports for those services in the firewall, and then only open the VPN port in the firewall for IP addresses that need access to it. If someone who needs access has a dynamic IP, then many firewalls these days support something like Single Packet Authorization or Port Knocking to dynamically open ports for unknown IP addresses.

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