Hvad er ODIN-filformatet?
En .odin-fil er en personlig fil, der er blevet krypteret af Locky ransomware. Locky er en Windows-malwarefamilie, der først dukkede op i starten af 2016 og låser dokumenter, fotos, databaser og arkiver, hvorefter den kræver betaling for deres returnering. Omkring september 2016 skiftede operatørerne den filtype, de tilføjede, fra .zepto til .odin, og navngav varianten efter den nordiske gud. Forskere hos Fortinet fandt ud af, at .odin-koden var 98-99 % identisk med den tidligere .zepto-version, så det er den samme malware i en ny forklædning.
Når Locky kører, scanner den efter cirka 400 filtyper, krypterer hver enkelt med AES-128 og låser AES-nøglen inde i en RSA-2048-kryptering. Derefter omdøber den hver fil til en hexadecimal identifikator som f.eks. 5FBZ55IG-S575-7GEF-2C7B-5B22862C2225.odin og sletter det oprindelige navn. Den sletter også Windows Shadow Volume Copies og efterlader løsesumsnotater med navnene _HOWDO_text.html og _HOWDO_text.bmp. At finde .odin-filer betyder, at computeren er inficeret, ikke at du ejer et usædvanligt filformat.
Sikkerhed og tryghed
RISIKO: HIGHThe presence of .odin files means the computer was hit by active ransomware. The .odin files themselves are inert encrypted data and cannot execute, but they signal that Locky ran on the system, deleted shadow copies and may still be present. Never pay the ransom without expert advice, and treat the machine as compromised until it is fully cleaned and, ideally, wiped and rebuilt from a trusted backup.
Formatdetaljer
kort fortalt- Samsung Odin firmware package - The Odin flashing tool for Samsung Galaxy devices uses firmware files, but those are typically .tar or .tar.md5 archives rather than a .odin extension. Unrelated to the ransomware.
- ODIN application data - A handful of niche applications have used .odin for internal data or backup files. These are legitimate and unrelated to Locky.
Programmer der åbner ODIN-filer
Windows4 apps
Malwarebytes
Freemium Run a full scan to detect and remove the Locky infection before attempting any recovery, since the encrypted .odin files themselves cannot be opened.
Emsisoft Anti-Malware
Betalt Scan the machine to clean out the ransomware, then check Emsisoft's decryptor catalog to confirm whether any tool covers your variant (none exists for Locky .odin).
Windows File Recovery / Shadow Explorer
Gratis Browse Volume Shadow Copies to restore earlier unencrypted versions of the files, though Locky usually deletes these.
ID Ransomware
Gratis Upload a ransom note and an .odin sample to confirm the exact ransomware family and whether any decryption is currently possible. Tekniske detaljer
dyb specifikation| Encoding | AES-128 (ECB mode) file encryption with the AES key protected by RSA-2048 |
| Byte order | N/A (encrypted ciphertext) |
| Container | None; the original file is overwritten in place as raw ciphertext with a renamed filename |
| Encryption | RSA-2048 + AES-128. The AES session keys are generated server-side by the attacker's command-and-control infrastructure, so the private key needed for decryption never stays on the victim machine. |
| Typical size | Roughly the same size as the original encrypted file |
| Structure | The plaintext of a targeted document, image, database or archive is replaced by AES-128 ciphertext. The file is then renamed to a hexadecimal identifier of the form [8]-[4]-[4]-[4]-[12] followed by the .odin extension (for example 5FBZ55IG-S575-7GEF-2C7B-5B22862C2225.odin). The original name and extension are not preserved on disk. |
| Platforms | Windows |
| Notes | Locky's .odin variant targets roughly 400 to 460 file types across documents, databases, images and archives. It deletes Windows Shadow Volume Copies to block local recovery and drops ransom notes named _HOWDO_text.html, _HOWDO_text.bmp and _[2-digit-number]_HOWDO_text.html. It is delivered by spam email carrying WSF/JS script attachments or macro-laden Office documents that download an encrypted DLL and run it via rundll32.exe. Despite the name, victims are infected by Locky using the .odin extension, not a separate 'Odin' malware family; code comparison shows a 98-99% match with the earlier .zepto variant. |
| Udgivet | September 2016 |
ODIN-konverteringer
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