Analysis

  • max time kernel
    294s
  • max time network
    246s
  • platform
    windows10-1703_x64
  • resource
    win10-20240221-en
  • resource tags

    arch:x64arch:x86image:win10-20240221-enlocale:en-usos:windows10-1703-x64system
  • submitted
    15/03/2024, 00:59

General

  • Target
    1f5ae695f8e423da25f7247410119055e1834f05946bd5e9e2541fd16d58dedb.exe
  • Size 736KB
  • Sample240315-bch6mscf31
  • SHA256 1f5ae695f8e423da25f7247410119055e1834f05946bd5e9e2541fd16d58dedb
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • djvu

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

Attributes
  • extension

    .kool

  • offline_id

    4p0Nzrg1q0ND5of5Gtp2UBjthSXuE8VxnMrd4vt1

  • 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/a832401adcd58098c699f768ffea4f1720240305114308/7e601a 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: 0856PsawqS

rsa_pubkey.plain

Signatures

  • Detected Djvu ransomware 19 IoCs
  • Djvu Ransomware

    Ransomware which is a variant of the STOP family.

  • Downloads MZ/PE file
  • Executes dropped EXE 10 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 7 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 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\1f5ae695f8e423da25f7247410119055e1834f05946bd5e9e2541fd16d58dedb.exe
    "C:\Users\Admin\AppData\Local\Temp\1f5ae695f8e423da25f7247410119055e1834f05946bd5e9e2541fd16d58dedb.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:3836
    • C:\Users\Admin\AppData\Local\Temp\1f5ae695f8e423da25f7247410119055e1834f05946bd5e9e2541fd16d58dedb.exe
      "C:\Users\Admin\AppData\Local\Temp\1f5ae695f8e423da25f7247410119055e1834f05946bd5e9e2541fd16d58dedb.exe"
      2⤵
      • Adds Run key to start application
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:4628
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\7c9d8581-453b-4523-9a98-7ffe23324f8e" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:1444
      • C:\Users\Admin\AppData\Local\Temp\1f5ae695f8e423da25f7247410119055e1834f05946bd5e9e2541fd16d58dedb.exe
        "C:\Users\Admin\AppData\Local\Temp\1f5ae695f8e423da25f7247410119055e1834f05946bd5e9e2541fd16d58dedb.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1740
        • C:\Users\Admin\AppData\Local\Temp\1f5ae695f8e423da25f7247410119055e1834f05946bd5e9e2541fd16d58dedb.exe
          "C:\Users\Admin\AppData\Local\Temp\1f5ae695f8e423da25f7247410119055e1834f05946bd5e9e2541fd16d58dedb.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:2456
          • C:\Users\Admin\AppData\Local\47184ebd-a31b-48ba-bd62-4f3cabe19276\build3.exe
            "C:\Users\Admin\AppData\Local\47184ebd-a31b-48ba-bd62-4f3cabe19276\build3.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:884
            • C:\Users\Admin\AppData\Local\47184ebd-a31b-48ba-bd62-4f3cabe19276\build3.exe
              "C:\Users\Admin\AppData\Local\47184ebd-a31b-48ba-bd62-4f3cabe19276\build3.exe"
              6⤵
              • Executes dropped EXE
              • Suspicious use of WriteProcessMemory
              PID:4948
              • 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:3144
  • 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:2028
    • 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:2904
      • 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:1276
  • 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:756
    • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      2⤵
      • Executes dropped EXE
      PID:4176
  • 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:4476
    • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      2⤵
      • Executes dropped EXE
      PID:1444
  • 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
    PID:1836
    • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      2⤵
      • Executes dropped EXE
      PID:4720

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 1dd5acc0e95a7e0a6eea0ce7e4ab2665c928db84a241f4006a06791343b84d27
        • 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 570e644c48ac80d38a5694ae66fb1bf7c5de91a69c19a9271cf7ad1a411b4dd5
        • MD5 SHA1 SHA512

        CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
        • Size 392B
        • SHA256 a779e6252337a68b20a33c26da5ebdce71970afd28d56a3cd5c391adec8990e0
        • MD5 SHA1 SHA512

        build2.exe

        • Path C:\Users\Admin\AppData\Local\47184ebd-a31b-48ba-bd62-4f3cabe19276\build2.exe
        • Size 32KB
        • SHA256 83f7572e37857d7e7b763e3cd5deec36b24d97fd00d657744c671d65283d23d6
        • MD5 SHA1 SHA512 SSDEEP

        build3.exe

        • Path C:\Users\Admin\AppData\Local\47184ebd-a31b-48ba-bd62-4f3cabe19276\build3.exe
        • Size 299KB
        • SHA256 fef2c8ca07c500e416fd7700a381c39899ee26ce1119f62e7c65cf922ce8b408
        • MD5 SHA1 SHA512 SSDEEP

        build3.exe

        • Path C:\Users\Admin\AppData\Local\47184ebd-a31b-48ba-bd62-4f3cabe19276\build3.exe
        • Size 68KB
        • SHA256 43517cd8f10171e61f2da1edd0e5d28b677120dc0d80c6e878ac091d98c4deda
        • MD5 SHA1 SHA512 SSDEEP

        1f5ae695f8e423da25f7247410119055e1834f05946bd5e9e2541fd16d58dedb.exe

        • Path C:\Users\Admin\AppData\Local\7c9d8581-453b-4523-9a98-7ffe23324f8e\1f5ae695f8e423da25f7247410119055e1834f05946bd5e9e2541fd16d58dedb.exe
        • Size 736KB
        • SHA256 1f5ae695f8e423da25f7247410119055e1834f05946bd5e9e2541fd16d58dedb
        • MD5 SHA1 SHA512 SSDEEP

        mstsca.exe

        • Path C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        • Size 74KB
        • SHA256 48e2d4986d44d4d3407c0636246335c993ab0783870f2c3ca102085b9edfb65b
        • MD5 SHA1 SHA512 SSDEEP

        mstsca.exe

        • Path C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        • Size 59KB
        • SHA256 8a224e8c33823aa928340038e593cdb3f9f8fdb0816e90d0585da9cc583eeaff
        • MD5 SHA1 SHA512 SSDEEP

        mstsca.exe

        • Path C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        • Size 84KB
        • SHA256 00a0d583a7038e905fa8edb3ec292cd659965fe068ce2e9dd3a0a8e1d0070d44
        • MD5 SHA1 SHA512 SSDEEP

        memory/756-102-0x0000000000B40000-0x0000000000C40000-memory.dmp

        memory/884-65-0x0000000000A30000-0x0000000000A34000-memory.dmp

        memory/884-64-0x0000000000B40000-0x0000000000C40000-memory.dmp

        memory/884-74-0x0000000000B40000-0x0000000000C40000-memory.dmp

        memory/1740-22-0x00000000021F0000-0x0000000002289000-memory.dmp

        memory/1836-145-0x0000000000830000-0x0000000000930000-memory.dmp

        memory/2028-83-0x0000000000960000-0x0000000000A60000-memory.dmp

        memory/2456-25-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2456-26-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2456-40-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2456-38-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2456-48-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2456-24-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2456-34-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2456-56-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2456-41-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2456-33-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3836-4-0x00000000021E0000-0x00000000022FB000-memory.dmp

        memory/3836-2-0x0000000002140000-0x00000000021DD000-memory.dmp

        memory/3836-49-0x00000000021E0000-0x00000000022FB000-memory.dmp

        memory/4176-107-0x0000000000410000-0x00000000004D5000-memory.dmp

        memory/4476-128-0x000000000084E000-0x000000000085E000-memory.dmp

        memory/4628-19-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4628-6-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4628-5-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4628-1-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4628-3-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4948-61-0x0000000000400000-0x0000000000406000-memory.dmp

        memory/4948-66-0x0000000000400000-0x0000000000406000-memory.dmp

        memory/4948-68-0x0000000000400000-0x0000000000406000-memory.dmp