What to Do If Your Files Suddenly Don't Open? A Collection of Ransomware Response Resources
Materials for reducing infection spread and checking official reporting, backup, and recovery options
If the extensions of your documents and photos suddenly change or if an alert demanding money appears, you might suspect ransomware. In such cases, contacting the numbers in the alert in a hurry or downloading an unverified decryption program can lead to further infection and fraud.
Disconnect suspected infected devices from the network and external storage devices, and if the device belongs to an organization, report it to the security officer before turning off the power or deleting files. Take photos of the memo screen, altered extensions, occurrence time, and recently executed files. Also, check for any abnormalities in shared folders on other devices within the same network.
The possibility of recovery depends on the type of ransomware, backup status, and extent of encryption, and no one can guarantee a specific outcome. There is also no guarantee that attackers will decrypt files after receiving payment.
This list compiles resources for domestic reporting and consultation, international decryption tool verification, and official recovery materials for operating systems and the cloud. Regularly having offline or isolated backups and restoration tests is the most realistic preparation. After an incident, do not think of infection removal and file recovery as the same task; proceed with validated procedures for each.
KISA Ransomware Reporting and Consultation
KISA Ransomware Reporting and Consultation is an official function or service that can be used for reporting and consulting on domestic ransomware incidents. Instead of judging by the name alone, it's important to check the operating entity and official domain together first.
Right after discovering a ransom note or file encryption, calmly review recent records and guidance on the usage screen, and capture any unfamiliar items with time, device, and location. If recovery or reporting is required, this record can serve as explanatory material for the situation.
Before reporting, document the ransom note, extension, and occurrence time, and preserve original files. Do not use it to test other people's accounts or systems and only use it within your ownership or explicit permission.
No More Ransom
No More Ransom is an official function or service that can be used for identifying types of ransomware and verifying public decryption tools. Instead of judging by the name alone, it's important to check the operating entity and official domain together first.
When checking for the existence of official tools, calmly review recent records and guidance on the usage screen, and capture any unfamiliar items with time, device, and location. If recovery or reporting is needed, this record can serve as explanatory material for the situation.
Verify the applicability of the tools and confirm with the expert regarding copies of important originals. Do not use it to test other people's accounts or systems and only use it within your ownership or explicit permission.
CISA StopRansomware
CISA StopRansomware is an official function or service that can be used to provide integrated prevention, response, and reporting materials for organizations. Instead of judging by the name alone, it's important to check the operating entity and official domain together first.
When preparing or reviewing incident response procedures for businesses or organizations, calmly review recent records and guidance on the usage screen, and capture any unfamiliar items with time, device, and location. If recovery or reporting is required, this record can serve as explanatory material for the situation.
Overseas guides do not replace domestic reporting obligations and internal procedures. Do not use it to test other people's accounts or systems and only use it within your ownership or explicit permission.
Microsoft Ransomware Protection
Microsoft Ransomware Protection is an official function or service that can be used to guide protective features such as Windows Security and Controlled Folder Access. Instead of judging by the name alone, it's important to check the operating entity and official domain together first.
When checking preliminary defensive settings on Windows PCs, calmly review recent records and guidance on the usage screen, and capture any unfamiliar items with time, device, and location. If recovery or reporting is needed, this record can serve as explanatory material for the situation.
Check for conflicts with business apps but do not follow unclear guidance to turn off protective features. Do not use it to test other people's accounts or systems and only use it within your ownership or explicit permission.
Windows File History
Windows File History is an official function or service that can be used to guide the version backup and restoration processes of personal files. Instead of judging by the name alone, it's important to check the operating entity and official domain together first.
When preparing backups or confirming recovery possibilities before infection, calmly review recent records and guidance on the usage screen, and capture any unfamiliar items with time, device, and location. If recovery or reporting is needed, this record can serve as explanatory material for the situation.
Do not reconnect backup drives before the infection has been removed. Do not use it to test other people's accounts or systems and only use it within your ownership or explicit permission.
OneDrive File Restore
OneDrive File Restore is an official function or service that can be used to guide the restoration of the entire OneDrive to a previous point in time. Instead of judging by the name alone, it's important to check the operating entity and official domain together first.
When a mass change or encryption has been synchronized to the cloud, calmly review recent records and guidance on the usage screen, and capture any unfamiliar items with time, device, and location. If recovery or reporting is needed, this record can serve as explanatory material for the situation.
Check the restoration period and pricing conditions, and first stop synchronization with the infected device. Do not use it to test other people's accounts or systems and only use it within your ownership or explicit permission.
Google Drive File Recovery Help
Google Drive File Recovery Help is an official function or service that can be used to verify recovery paths for deleted or modified Drive files. Instead of judging by the name alone, it's important to check the operating entity and official domain together first.
When you notice damage or mass changes to Google Drive data, calmly review recent records and guidance on the usage screen, and capture any unfamiliar items with time, device, and location. If recovery or reporting is needed, this record can serve as explanatory material for the situation.
Before recovery, check the session and password of your Google account to prevent re-infection. Do not use it to test other people's accounts or systems and only use it within your ownership or explicit permission.
Apple Time Machine Recovery
Apple Time Machine Restore
Apple Time Machine Restore is an official procedure that can be used to restore backups of files and systems on Mac. Instead of judging by the name alone, it's important to check the operating entity and official domain together first.
When checking if there is a Time Machine backup before the infection, calmly review recent records and guidance on the usage screen, and capture any unfamiliar items with time, device, and location. If recovery or reporting is needed, this record can serve as explanatory material for the situation.
Do not hastily connect backup disks to a Mac where the infection status is unclear. Do not use it to test other people's accounts or systems and only use it within your ownership or explicit permission.
In a ransomware incident, preserving evidence and originals is more important than 'quick decryption' as a first step. Even for personal PCs, if shared folders, NAS, or cloud sync folders were connected, you should broadly check the impact range.
While there are public decryption tools for some types, there is no万能 program that fits all variants. Do not select a tool solely based on similar file extensions or monetary demands.
Version history in the cloud or operating system backups provide a way to revert to a point before infection, but synchronized files and backups might be damaged together. Connecting restoration storage devices without confirming that the infection has been removed can endanger backups. After recovery, also check account passwords and remote access settings.
Once the incident is over, it is important to test whether backups can actually restore rather than just having backups. Keep important data in copies separate from working devices, and maintain upgrades, multi-factor authentication, and the principle of least privilege. Documenting the reporting records and response process simply can help reduce the chance of suffering from the same route again.
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