Hvad er EIUR-filformatet?
En .eiur fil er en almindelig fil, der er blevet krypteret af EIUR ransomware, en variant af den udbredte STOP/Djvu-familie. Denne stamme dukkede op omkring midten af 2022 og opfører sig som sine mange søskende, idet den primært adskiller sig ved den firebogstavs-udvidelse, den tilføjer. Når EIUR inficerer en Windows PC, koder den dokumenter, fotos, databaser og videoer med Salsa20-cipheren, beskytter denne nøgle med RSA-2048 og omdøber hver fil, så budget.xlsx bliver til budget.xlsx.eiur. Den efterlader derefter en løsesumsbesked kaldet _readme.txt i hver berørt mappe, som kræver $980 i Bitcoin (eller $490 inden for 72 timer) og angiver kontaktadresserne [email protected] og [email protected].
For at arbejde hurtigt krypterer malwaren kun de første 150 KB af hver fil, hvilket er grunden til, at store filer nogle gange er delvist intakte. At se .eiur filer betyder, at ransomwaren blev eksekveret på din maskine, og den kan have installeret en adgangskodestjælende trojaner sammen med krypteringsprogrammet.
Sikkerhed og tryghed
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
kort fortaltProgrammer der åbner 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
Indbygget 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. Tekniske detaljer
dyb specifikation| 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. |
| Udgivet | 2022 (STOP/Djvu variant appeared around late June 2022) |
EIUR-konverteringer
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