Analysis

  • max time kernel
    90s
  • max time network
    116s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    15/04/2024, 23:27

General

  • Target

    50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe

  • Size

    860KB

  • MD5

    7bf2ed31e5b9c59d24f750dbbcf10ab5

  • SHA1

    1ff4a18a6d8ec058be1896dc90757f42e60c588b

  • SHA256

    50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496

  • SHA512

    88ef1d7c63190df6e832dbb71f1790911e5f0b41c492de124f605d4a261e7c8b7a4519e23fc6d8abc9db642940431c97a622e6a7b6f71d7086644a1c7525c04d

  • SSDEEP

    12288:aPeK5kzr8+6omE6wZGkJWGcowKFUXqtDvGBf+MpMMFUMxO38/njdk4:aPQN6jPZK2qgf+MtFURGnjh

Malware Config

Extracted

Family

djvu

C2

http://sajdfue.com/test1/get.php

Attributes
  • extension

    .uajs

  • offline_id

    Jx0i3k2ogR5cKxX1evmz0Ex7TUxOUlnbh2dvnIt1

  • payload_url

    http://sdfjhuz.com/dl/build2.exe

    http://sajdfue.com/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. Do not ask assistants from youtube and recovery data sites for help in recovering your data. They can use your free decryption quota and scam you. Our contact is emails in this text document only. You can get and look video overview decrypt tool: https://wetransfer.com/downloads/df01994dd8d37c2c33469922f8e7155a20240402134014/fd95b0 Price of private key and decrypt software is $999. Discount 50% available if you contact us first 72 hours, that's price for you is $499. 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: 0859PsawqS

rsa_pubkey.plain

Signatures

  • Detected Djvu ransomware 9 IoCs
  • Djvu Ransomware

    Ransomware which is a variant of the STOP 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
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of WriteProcessMemory 26 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe
    "C:\Users\Admin\AppData\Local\Temp\50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:2768
    • C:\Users\Admin\AppData\Local\Temp\50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe
      "C:\Users\Admin\AppData\Local\Temp\50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe"
      2⤵
      • Checks computer location settings
      • Adds Run key to start application
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:1520
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\0ca49812-f7b2-4447-bc93-fa6adac3949e" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:1248
      • C:\Users\Admin\AppData\Local\Temp\50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe
        "C:\Users\Admin\AppData\Local\Temp\50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4648
        • C:\Users\Admin\AppData\Local\Temp\50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe
          "C:\Users\Admin\AppData\Local\Temp\50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
            PID:1812
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -u -p 1812 -s 568
              5⤵
              • Program crash
              PID:2700
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 1812 -ip 1812
      1⤵
        PID:4064

      Network

      MITRE ATT&CK Enterprise v15

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\Users\Admin\AppData\Local\0ca49812-f7b2-4447-bc93-fa6adac3949e\50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496.exe

        Filesize

        860KB

        MD5

        7bf2ed31e5b9c59d24f750dbbcf10ab5

        SHA1

        1ff4a18a6d8ec058be1896dc90757f42e60c588b

        SHA256

        50979b951973f2f49176bca671a6be0c7109439c680d34a57cea62861d4e2496

        SHA512

        88ef1d7c63190df6e832dbb71f1790911e5f0b41c492de124f605d4a261e7c8b7a4519e23fc6d8abc9db642940431c97a622e6a7b6f71d7086644a1c7525c04d

      • memory/1520-3-0x0000000000400000-0x0000000000537000-memory.dmp

        Filesize

        1.2MB

      • memory/1520-4-0x0000000000400000-0x0000000000537000-memory.dmp

        Filesize

        1.2MB

      • memory/1520-5-0x0000000000400000-0x0000000000537000-memory.dmp

        Filesize

        1.2MB

      • memory/1520-6-0x0000000000400000-0x0000000000537000-memory.dmp

        Filesize

        1.2MB

      • memory/1520-19-0x0000000000400000-0x0000000000537000-memory.dmp

        Filesize

        1.2MB

      • memory/1812-24-0x0000000000400000-0x0000000000537000-memory.dmp

        Filesize

        1.2MB

      • memory/1812-25-0x0000000000400000-0x0000000000537000-memory.dmp

        Filesize

        1.2MB

      • memory/1812-27-0x0000000000400000-0x0000000000537000-memory.dmp

        Filesize

        1.2MB

      • memory/2768-1-0x0000000004B30000-0x0000000004BCE000-memory.dmp

        Filesize

        632KB

      • memory/2768-2-0x0000000004BD0000-0x0000000004CEB000-memory.dmp

        Filesize

        1.1MB

      • memory/4648-22-0x00000000049B0000-0x0000000004A49000-memory.dmp

        Filesize

        612KB