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Start with the No More Ransom Project’s Crypto Sheriff. It is designed to help identify the ransomware and check whether a decryption solution is available. A match to a ransomware family does not guarantee that a decryptor will work on your particular files: the variant, available keys and the tool’s conditions matter.
Check for a matching decryptor
- Preserve the evidence. Keep the ransom note and a few encrypted files unchanged. CISA advises preserving evidence such as ransom notes and samples while seeking help; avoid deleting or modifying these clues during identification. See CISA’s #StopRansomware Guide.
- Use Crypto Sheriff. Visit the No More Ransom Project’s Crypto Sheriff and follow its current instructions for submitting evidence. Accepted file types and submission steps can change, so rely on the live tool interface rather than assumptions about what it accepts.
- Check the solution against your infection. Review the result and any associated decryptor information. Confirm that the named ransomware family or variant and the stated key or file conditions fit your case. A familiar ransom-note name or encrypted-file extension alone is not enough to establish that a tool applies.
- If there is no match, keep the evidence. An unknown result means the service could not establish a match from what you submitted; it does not prove that recovery is impossible. No More Ransom says keys may be incomplete and advises checking again, but that is not a promise that a suitable key or decryptor will become available.
Why a decryptor may exist—or not
No More Ransom describes several ways a decryption solution can become possible: ransomware authors may make an exploitable implementation mistake, release keys or a master key, or have a server holding keys seized by law enforcement, which may then share those keys. These explain how some decryptors emerge; they do not predict whether one will be available for a particular victim.
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Even when a tool is listed for a known family, it may not have all the keys needed for a victim’s files. Treat an identification as a starting point, then check whether the available tool explicitly covers the relevant variant and conditions.
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For an individual or home computer
Keep the ransom note and sample files intact, and check the official identification resource again later. A missing listing is not proof that no decryptor can ever exist, but neither the listing nor the possibility of future keys guarantees recovery. Avoid relying on an unrelated tool merely because its name or file-extension examples look similar.
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Preserve incident evidence and escalate through appropriate channels. CISA’s September 2023 #StopRansomware Guide recommends consulting federal law enforcement about possible decryptors even when mitigation actions are possible. The FBI says victims can contact a local field office or submit information through IC3. Follow your organization’s incident-response procedures while doing so.
Do not treat payment as a recovery plan
The FBI says it does not support paying a ransom, and cautions that payment does not guarantee data recovery. No More Ransom also warns that paying may fail to restore files. A demand for payment is not evidence that the attacker can or will provide a working key.
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How to judge a candidate decryptor
Before using a tool, check the details—not just the ransomware name. These are practical checks based on the identification and evidence-preservation guidance, not a formal scoring system:
- Specificity: Does the identification establish the family or variant clearly enough to distinguish it from lookalikes?
- Coverage: Does the decryptor explicitly name that family or variant?
- Conditions: Do its stated key, file or infection conditions match the case?
- Source: Is the information from an official project, law-enforcement agency or trusted security vendor?
If any of these points is unclear, do not assume the tool is suitable. Preserve the evidence and seek guidance from an appropriate incident-response professional or law-enforcement agency.
Quick Recap
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