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Analysis

  • max time kernel
    96s
  • max time network
    129s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    21/12/2024, 16:23

General

  • Target

    sample.exe

  • Size

    775KB

  • MD5

    b318b2664abf0d93433255643aaae35c

  • SHA1

    9f8748a0459a6cef1a67c3b44c21f3eaa8e360f0

  • SHA256

    4fbf13052ed4c7f12cda197e43998550d4b698d53ca08616929dbded612726c2

  • SHA512

    f6dffa75f2caf6a57130e911461626adefa5301ef02ad00f9d606c155c983971c9b49e6905ed063c3becaf331aad2d694a68a7302316a33937c8f75592ff869f

  • SSDEEP

    12288:uqyWSUBQv0EroDgRgp4LPTskElzS9zad8HT/AB+c9X+oeJzYf94SRZj1LJ+H:uqNQv0XDegs2SpSI0X+oB4SRZjxgH

Malware Config

Extracted

Family

djvu

C2

http://fuyt.org/fhsgtsspen6/get.php

Attributes
  • extension

    .uyjh

  • offline_id

    LgcOIftV0dQfFBQStVNfb8BhHy8tHRPvXwSiFwt1

  • payload_url

    http://zerit.top/dl/build2.exe

    http://fuyt.org/files/1/build3.exe

  • ransomnote

    ATTENTION! Don't worry, you can return all your files! All your files like pictures, databases, documents and other important are encrypted with strongest encryption and unique key. The only method of recovering files is to purchase decrypt tool and unique key for you. This software will decrypt all your encrypted files. What guarantees you have? You can send one of your encrypted file from your PC and we decrypt it for free. But we can decrypt only 1 file for free. File must not contain valuable information. You can get and look video overview decrypt tool: https://we.tl/t-FglTTmgzZT Price of private key and decrypt software is $980. Discount 50% available if you contact us first 72 hours, that's price for you is $490. Please note that you'll never restore your data without payment. Check your e-mail "Spam" or "Junk" folder if you don't get answer more than 6 hours. To get this software you need write on our e-mail: [email protected] Reserve e-mail address to contact us: [email protected] Your personal ID: 0443tOjkfd

rsa_pubkey.plain

Signatures

  • Detected Djvu ransomware 9 IoCs
  • Djvu Ransomware

    Ransomware which is a variant of the STOP family.

  • Djvu family
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Modifies file permissions 1 TTPs 1 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Looks up external IP address via web service 2 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Suspicious use of SetThreadContext 2 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Program crash 1 IoCs
  • System Location Discovery: System Language Discovery 1 TTPs 5 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of WriteProcessMemory 26 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\sample.exe
    "C:\Users\Admin\AppData\Local\Temp\sample.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2816
    • C:\Users\Admin\AppData\Local\Temp\sample.exe
      "C:\Users\Admin\AppData\Local\Temp\sample.exe"
      2⤵
      • Checks computer location settings
      • Adds Run key to start application
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:4840
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\8aa1d9c2-e23d-442a-ab6f-4a1b4ca4264f" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        • System Location Discovery: System Language Discovery
        PID:2808
      • C:\Users\Admin\AppData\Local\Temp\sample.exe
        "C:\Users\Admin\AppData\Local\Temp\sample.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:2832
        • C:\Users\Admin\AppData\Local\Temp\sample.exe
          "C:\Users\Admin\AppData\Local\Temp\sample.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • System Location Discovery: System Language Discovery
          PID:2416
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2416 -s 584
            5⤵
            • Program crash
            PID:2444
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 2416 -ip 2416
    1⤵
      PID:3556

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

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    Downloads

    • C:\Users\Admin\AppData\Local\8aa1d9c2-e23d-442a-ab6f-4a1b4ca4264f\sample.exe

      Filesize

      775KB

      MD5

      b318b2664abf0d93433255643aaae35c

      SHA1

      9f8748a0459a6cef1a67c3b44c21f3eaa8e360f0

      SHA256

      4fbf13052ed4c7f12cda197e43998550d4b698d53ca08616929dbded612726c2

      SHA512

      f6dffa75f2caf6a57130e911461626adefa5301ef02ad00f9d606c155c983971c9b49e6905ed063c3becaf331aad2d694a68a7302316a33937c8f75592ff869f

    • memory/2416-24-0x0000000000400000-0x0000000000537000-memory.dmp

      Filesize

      1.2MB

    • memory/2416-26-0x0000000000400000-0x0000000000537000-memory.dmp

      Filesize

      1.2MB

    • memory/2416-23-0x0000000000400000-0x0000000000537000-memory.dmp

      Filesize

      1.2MB

    • memory/2816-2-0x0000000002380000-0x000000000249B000-memory.dmp

      Filesize

      1.1MB

    • memory/2816-1-0x0000000002260000-0x00000000022FB000-memory.dmp

      Filesize

      620KB

    • memory/2832-21-0x0000000000400000-0x00000000004CC000-memory.dmp

      Filesize

      816KB

    • memory/2832-27-0x0000000000400000-0x00000000004CC000-memory.dmp

      Filesize

      816KB

    • memory/4840-3-0x0000000000400000-0x0000000000537000-memory.dmp

      Filesize

      1.2MB

    • memory/4840-4-0x0000000000400000-0x0000000000537000-memory.dmp

      Filesize

      1.2MB

    • memory/4840-5-0x0000000000400000-0x0000000000537000-memory.dmp

      Filesize

      1.2MB

    • memory/4840-6-0x0000000000400000-0x0000000000537000-memory.dmp

      Filesize

      1.2MB

    • memory/4840-19-0x0000000000400000-0x0000000000537000-memory.dmp

      Filesize

      1.2MB