Wat is het EIUR-bestandsformaat?
Een .eiur-bestand is een gewoon bestand dat is versleuteld door EIUR-ransomware, een variant van de wijdverspreide STOP/Djvu-familie. Deze variant verscheen rond medio 2022 en gedraagt zich als zijn vele broers en zussen, waarbij het belangrijkste verschil de vierletterige extensie is die het toevoegt. Wanneer EIUR een Windows-pc infecteert, versleutelt het documenten, foto's, databases en video's met het Salsa20-cijfer, beschermt het die sleutel met RSA-2048 en hernoemt het elk bestand zodat budget.xlsx verandert in budget.xlsx.eiur. Vervolgens plaatst het een losgeldnotitie genaamd _readme.txt in elke getroffen map, waarin „$980” in Bitcoin wordt geëist (of „$490” binnen 72 uur) en de contactadressen [email protected] en [email protected] worden vermeld.
Om snel te kunnen werken, versleutelt de malware alleen de eerste 150 KB van elk bestand, waardoor grote bestanden soms gedeeltelijk intact zijn. Het zien van .eiur-bestanden betekent dat de ransomware op uw machine is uitgevoerd en dat er mogelijk een wachtwoordstelende trojan naast de versleutelaar is geïnstalleerd.
Beveiliging & veiligheid
RISICO: 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.
Formaatdetails
in een notendopProgramma's die EIUR-bestanden openen
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
Ingebouwd 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
Open-source Carve deleted original files from the disk after encryption, since STOP/Djvu often encrypts a copy and deletes the source, leaving recoverable remnants. Technische details
diepe specificaties| 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. |
| Uitgebracht | 2022 (STOP/Djvu variant appeared around late June 2022) |
EIUR conversies
Community V&A
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