Hva er EIUR-filformatet?
En .eiur-fil er en vanlig fil som har blitt kryptert av EIUR løsepengevirus, en variant av den utbredte STOP/Djvu-familien. Denne varianten dukket opp rundt midten av 2022 og oppfører seg som sine mange søsken, og skiller seg hovedsakelig ved den firebokstavers utvidelsen den legger til. Når EIUR infiserer en Windows-PC, koder den dokumenter, bilder, databaser og videoer med Salsa20-chifferet, beskytter den nøkkelen med RSA-2048, og gir hver fil nytt navn slik at budget.xlsx blir budget.xlsx.eiur. Den legger deretter igjen et kravbrev kalt _readme.txt i hver berørte mappe, som krever «$980» i Bitcoin (eller «$490» innen 72 timer) og oppgir kontaktadressene [email protected] og [email protected].
For å jobbe raskt krypterer skadevaren bare de første 150 KB av hver fil, noe som er grunnen til at store filer noen ganger er delvis intakte. Å se .eiur-filer betyr at løsepengeviruset ble kjørt på maskinen din, og det kan ha installert en passordstjelende trojaner sammen med krypteringsprogrammet.
Sikkerhet og trygghet
RISIKO: 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.
Formatdetaljer
i et nøtteskallProgrammer som åpner EIUR-filer
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
Innebygd 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
Åpen kildekode Carve deleted original files from the disk after encryption, since STOP/Djvu often encrypts a copy and deletes the source, leaving recoverable remnants. Tekniske detaljer
dyp spesifikasjon| 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. |
| Utgitt | 2022 (STOP/Djvu variant appeared around late June 2022) |
EIUR-konverteringer
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