¿Qué es el formato de archivo EIUR?
Un archivo .eiur es un archivo ordinario que ha sido cifrado por el ransomware EIUR, una variante de la extendida familia STOP/Djvu. Esta cepa apareció a mediados de 2022 y se comporta como sus muchos hermanos, diferenciándose principalmente en la extensión de cuatro letras que añade. Cuando EIUR infecta un PC con Windows, codifica documentos, fotos, bases de datos y videos con el cifrado Salsa20, protege esa clave con RSA-2048 y renombra cada archivo para que budget.xlsx se convierta en budget.xlsx.eiur. Luego suelta una nota de rescate llamada _readme.txt en cada carpeta afectada, exigiendo «$980» en Bitcoin (o «$490» si se paga en 72 horas) y listando las direcciones de contacto [email protected] y [email protected].
Para trabajar rápidamente, el malware cifra solo los primeros 150 KB de cada archivo, razón por la cual los archivos grandes a veces están parcialmente intactos. Ver archivos .eiur significa que el ransomware se ejecutó en su máquina y es posible que haya instalado un troyano de robo de contraseñas junto con el cifrador.
Seguridad y protección
RIESGO: HIGHA .eiur file is itself inert ciphertext, but its presence means active ransomware ran on the machine and may still be resident along with a bundled information-stealer such as RedLine or Vidar. Do not pay the ransom; there is no guarantee of a key and payment funds further attacks. Isolate the device, run a reputable anti-malware scan to remove the executable, then attempt recovery only from backups or the Emsisoft decryptor.
Detalles del formato
en pocas palabrasProgramas que abren archivos EIUR
Windows5 apps
Emsisoft Decryptor for STOP Djvu
Gratis Download and run the decryptor, let it scan your drives, and it will restore files that were encrypted with a known offline key; it reports when an online key was used and files cannot be recovered.
Malwarebytes
Freemium Run a full scan to detect and quarantine the EIUR ransomware executable and any bundled stealer before attempting any file recovery.
Windows System Restore
Integrado Roll the system back to a restore point created before the infection to recover unencrypted copies, if restore points survived the attack.
ShadowExplorer
Gratis Browse Volume Shadow Copies to pull earlier, unencrypted versions of files, though STOP/Djvu usually deletes shadow copies.
PhotoRec
Código abierto Carve deleted original files from the disk after encryption, since STOP/Djvu often encrypts a copy and deletes the source, leaving recoverable remnants. Detalles técnicos
especificación profunda| Encoding | Salsa20 stream cipher applied to file contents |
| Encryption | Salsa20 for data; the Salsa20 key is protected with RSA-2048. Each victim receives either a shared 'offline' key (used when the C2 server is unreachable) or a unique 'online' key fetched from the attacker server. |
| Byte order | N/A (opaque ciphertext) |
| Container | Original file wrapped with encrypted payload plus an appended block containing the encryption marker and victim key/ID data |
| Partial Encryption | Only the first 150 KB of each file is encrypted, which is why large files are sometimes partially recoverable or repairable |
| Typical size | Same as the original file plus a small appended overhead |
| Structure | Original data encrypted in-place at the start of the file, with a trailing signature and embedded key/personal-ID block; the '.eiur' extension is appended to the original filename (for example 'photo.jpg' becomes 'photo.jpg.eiur'). |
| Integrity | None; no integrity field is present |
| Ransom Note | _readme.txt dropped in every folder with encrypted files and on the desktop |
| Ransom Amount | USD 980, reduced to USD 490 if the victim contacts the attackers within 72 hours, payable in Bitcoin |
| Attacker Contacts | [email protected] and [email protected] |
| Malware Family | STOP/Djvu ransomware |
| Platforms | Windows |
| Notes | EIUR spreads through cracked software, key generators, fake installers and malicious downloads, and often bundles a secondary information-stealer (such as RedLine or Vidar). Files encrypted with a known offline key can sometimes be recovered with Emsisoft's free decryptor; files encrypted with a unique online key cannot be decrypted without the attacker's private key. |
| Lanzado | 2022 (STOP/Djvu variant appeared around late June 2022) |
Conversiones de EIUR
Preguntas y respuestas de la comunidad
preguntado por usuariosAún no hay preguntas; sea el primero en preguntar sobre los archivos EIUR.
