Analysis

  • max time kernel
    146s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/03/2024, 01:16

General

  • Target
    d719fb3907f47d91d33b86497eb07d88.exe
  • Size 811KB
  • Sample240319-bmsg3aec2y
  • SHA256 6aca49f129d7eb89f198149671cfa552ddfbbc5dc40039dbadadcb7158431d61
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • djvu

C2
  • http://sajdfue.com/test2/get.php

Attributes
  • extension

    .looy

  • offline_id

    1eSPzWRaNslCgtjBZfL5pzvovoiaVI4IZSnvAwt1

  • 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/3ed7a617738550b0a00c5aa231c0752020240316170955/d71ce1 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: 0858PsawqS

rsa_pubkey.plain

Signatures

  • Detected Djvu ransomware 18 IoCs
  • Djvu Ransomware

    Ransomware which is a variant of the STOP family.

  • Downloads MZ/PE file
  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Executes dropped EXE 6 IoCs
  • 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 3 IoCs

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

  • Suspicious use of SetThreadContext 5 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 2 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of WriteProcessMemory 62 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\d719fb3907f47d91d33b86497eb07d88.exe
    "C:\Users\Admin\AppData\Local\Temp\d719fb3907f47d91d33b86497eb07d88.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:4536
    • C:\Users\Admin\AppData\Local\Temp\d719fb3907f47d91d33b86497eb07d88.exe
      "C:\Users\Admin\AppData\Local\Temp\d719fb3907f47d91d33b86497eb07d88.exe"
      2⤵
      • Checks computer location settings
      • Adds Run key to start application
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:1568
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\e547fbea-953e-4024-abf0-954e75b1c221" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:4948
      • C:\Users\Admin\AppData\Local\Temp\d719fb3907f47d91d33b86497eb07d88.exe
        "C:\Users\Admin\AppData\Local\Temp\d719fb3907f47d91d33b86497eb07d88.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4052
        • C:\Users\Admin\AppData\Local\Temp\d719fb3907f47d91d33b86497eb07d88.exe
          "C:\Users\Admin\AppData\Local\Temp\d719fb3907f47d91d33b86497eb07d88.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Checks computer location settings
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:1952
          • C:\Users\Admin\AppData\Local\75745bcf-a874-4f94-b9e4-56ca8fe92f4c\build3.exe
            "C:\Users\Admin\AppData\Local\75745bcf-a874-4f94-b9e4-56ca8fe92f4c\build3.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:2928
            • C:\Users\Admin\AppData\Local\75745bcf-a874-4f94-b9e4-56ca8fe92f4c\build3.exe
              "C:\Users\Admin\AppData\Local\75745bcf-a874-4f94-b9e4-56ca8fe92f4c\build3.exe"
              6⤵
              • Executes dropped EXE
              • Suspicious use of WriteProcessMemory
              PID:4636
              • C:\Windows\SysWOW64\schtasks.exe
                /C /create /F /sc minute /mo 1 /tn "Azure-Update-Task" /tr "C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe"
                7⤵
                • Creates scheduled task(s)
                PID:1440
  • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
    C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:636
    • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      2⤵
      • Executes dropped EXE
      • Suspicious use of WriteProcessMemory
      PID:4376
      • C:\Windows\SysWOW64\schtasks.exe
        /C /create /F /sc minute /mo 1 /tn "Azure-Update-Task" /tr "C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe"
        3⤵
        • Creates scheduled task(s)
        PID:2884
  • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
    C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:3796
    • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      2⤵
      • Executes dropped EXE
      PID:1832

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA
        • Size 1KB
        • SHA256 39dd29569cb51bc9ffb6f0b600e4cc81a65e911e874841e9d5c36143da35f90a
        • MD5 SHA1 SHA512

        CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
        • Size 724B
        • SHA256 58f381c3a0a0ace6321da22e40bd44a597bd98b9c9390ab9258426b5cf75a7a5
        • MD5 SHA1 SHA512

        24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA
        • Size 410B
        • SHA256 d22b15e48798d8299dede177e200f6971174ae153b41773fa0012db1bc0c18b5
        • MD5 SHA1 SHA512

        CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
        • Size 392B
        • SHA256 aeec0efef00d68e2b8d23bc503e1014688f52c2ecfee34d5302099fee34a6867
        • MD5 SHA1 SHA512

        build2.exe

        • Path C:\Users\Admin\AppData\Local\75745bcf-a874-4f94-b9e4-56ca8fe92f4c\build2.exe
        • Size 603B
        • SHA256 cd14bf175eb4ee40474a82c7baeeff333ae10bc04332fe5b4c2e94a2a8690837
        • MD5 SHA1 SHA512

        build3.exe

        • Path C:\Users\Admin\AppData\Local\75745bcf-a874-4f94-b9e4-56ca8fe92f4c\build3.exe
        • Size 299KB
        • SHA256 fef2c8ca07c500e416fd7700a381c39899ee26ce1119f62e7c65cf922ce8b408
        • MD5 SHA1 SHA512 SSDEEP

        d719fb3907f47d91d33b86497eb07d88.exe

        • Path C:\Users\Admin\AppData\Local\e547fbea-953e-4024-abf0-954e75b1c221\d719fb3907f47d91d33b86497eb07d88.exe
        • Size 811KB
        • SHA256 6aca49f129d7eb89f198149671cfa552ddfbbc5dc40039dbadadcb7158431d61
        • MD5 SHA1 SHA512 SSDEEP

        memory/636-92-0x0000000000980000-0x0000000000A80000-memory.dmp

        memory/1568-19-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1568-6-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1568-5-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1568-3-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1568-4-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1952-34-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1952-64-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1952-24-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1952-26-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1952-33-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1952-38-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1952-40-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1952-41-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1952-25-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1952-51-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1952-52-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2928-75-0x00000000022B0000-0x00000000022B4000-memory.dmp

        memory/2928-74-0x00000000008DD000-0x00000000008ED000-memory.dmp

        memory/3796-110-0x0000000000AC0000-0x0000000000BC0000-memory.dmp

        memory/4052-22-0x0000000004890000-0x0000000004922000-memory.dmp

        memory/4536-1-0x0000000004B20000-0x0000000004BB5000-memory.dmp

        memory/4536-2-0x0000000004BC0000-0x0000000004CDB000-memory.dmp

        memory/4636-71-0x0000000000400000-0x0000000000406000-memory.dmp

        memory/4636-76-0x0000000000400000-0x0000000000406000-memory.dmp

        memory/4636-77-0x0000000000400000-0x0000000000406000-memory.dmp

        memory/4636-79-0x0000000000410000-0x00000000004D9000-memory.dmp

        memory/4636-80-0x0000000000400000-0x0000000000406000-memory.dmp