Analysis

  • max time kernel
    297s
  • max time network
    303s
  • platform
    windows10-1703_x64
  • resource
    win10-20231215-en
  • resource tags

    arch:x64arch:x86image:win10-20231215-enlocale:en-usos:windows10-1703-x64system
  • submitted
    28/01/2024, 22:24

General

  • Target
    ad77f5ec3c9dfee928926d4eda4577ceccd3cdef707a198e46bdd654caa7ecbb.exe
  • Size 726KB
  • Sample240128-2bnb3sbeb3
  • SHA256 ad77f5ec3c9dfee928926d4eda4577ceccd3cdef707a198e46bdd654caa7ecbb
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • djvu

C2
  • http://habrafa.com/test1/get.php

Attributes
  • extension

    .cdcc

  • offline_id

    LBxKKiegnAy53rpqH3Pj2j46vwldiEt9kqHSuMt1

  • payload_url

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

    http://habrafa.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. You can get and look video overview decrypt tool: https://we.tl/t-iVcrVFVRqu Price of private key and decrypt software is $1999. Discount 50% available if you contact us first 72 hours, that's price for you is $999. 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: 0846ASdw

rsa_pubkey.plain

Signatures

  • Detected Djvu ransomware 18 IoCs
  • Djvu Ransomware

    Ransomware which is a variant of the STOP family.

  • Downloads MZ/PE file
  • Executes dropped EXE 12 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 8 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\ad77f5ec3c9dfee928926d4eda4577ceccd3cdef707a198e46bdd654caa7ecbb.exe
    "C:\Users\Admin\AppData\Local\Temp\ad77f5ec3c9dfee928926d4eda4577ceccd3cdef707a198e46bdd654caa7ecbb.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:168
    • C:\Users\Admin\AppData\Local\Temp\ad77f5ec3c9dfee928926d4eda4577ceccd3cdef707a198e46bdd654caa7ecbb.exe
      "C:\Users\Admin\AppData\Local\Temp\ad77f5ec3c9dfee928926d4eda4577ceccd3cdef707a198e46bdd654caa7ecbb.exe"
      2⤵
      • Adds Run key to start application
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:220
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\233fe963-164c-41ba-a472-b80121d7d3b5" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:2092
      • C:\Users\Admin\AppData\Local\Temp\ad77f5ec3c9dfee928926d4eda4577ceccd3cdef707a198e46bdd654caa7ecbb.exe
        "C:\Users\Admin\AppData\Local\Temp\ad77f5ec3c9dfee928926d4eda4577ceccd3cdef707a198e46bdd654caa7ecbb.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1524
        • C:\Users\Admin\AppData\Local\Temp\ad77f5ec3c9dfee928926d4eda4577ceccd3cdef707a198e46bdd654caa7ecbb.exe
          "C:\Users\Admin\AppData\Local\Temp\ad77f5ec3c9dfee928926d4eda4577ceccd3cdef707a198e46bdd654caa7ecbb.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:356
          • C:\Users\Admin\AppData\Local\837ac41c-8335-48ba-b04f-bf969c8b0d74\build3.exe
            "C:\Users\Admin\AppData\Local\837ac41c-8335-48ba-b04f-bf969c8b0d74\build3.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:4032
            • C:\Users\Admin\AppData\Local\837ac41c-8335-48ba-b04f-bf969c8b0d74\build3.exe
              "C:\Users\Admin\AppData\Local\837ac41c-8335-48ba-b04f-bf969c8b0d74\build3.exe"
              6⤵
              • Executes dropped EXE
              • Suspicious use of WriteProcessMemory
              PID:592
              • 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:3712
  • 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:2240
    • 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:2140
      • 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:1520
  • 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:4684
    • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      2⤵
      • Executes dropped EXE
      PID:1588
  • 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:3192
    • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      2⤵
      • Executes dropped EXE
      PID:744
  • 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:2092
    • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      2⤵
      • Executes dropped EXE
      PID:212
  • 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:2480
    • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
      2⤵
      • Executes dropped EXE
      PID:4556

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 c5dff2b8854fb9ed981ebdb1d6b621cf681bd1ac18ac44b14c138cd05352365b
        • 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 ef60ae7b3b7375f4d47b7ba830a37326cb0ca69847964823dbe26444a174d43b
        • MD5 SHA1 SHA512

        CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
        • Size 392B
        • SHA256 1889ca393c4dc9481e4bbe56dfc19637d53c77d6242cc64057e303386ea1381b
        • MD5 SHA1 SHA512

        ad77f5ec3c9dfee928926d4eda4577ceccd3cdef707a198e46bdd654caa7ecbb.exe

        • Path C:\Users\Admin\AppData\Local\233fe963-164c-41ba-a472-b80121d7d3b5\ad77f5ec3c9dfee928926d4eda4577ceccd3cdef707a198e46bdd654caa7ecbb.exe
        • Size 726KB
        • SHA256 ad77f5ec3c9dfee928926d4eda4577ceccd3cdef707a198e46bdd654caa7ecbb
        • MD5 SHA1 SHA512 SSDEEP

        build3.exe

        • Path C:\Users\Admin\AppData\Local\837ac41c-8335-48ba-b04f-bf969c8b0d74\build3.exe
        • Size 299KB
        • SHA256 fef2c8ca07c500e416fd7700a381c39899ee26ce1119f62e7c65cf922ce8b408
        • MD5 SHA1 SHA512 SSDEEP

        mstsca.exe

        • Path C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        • Size 124KB
        • SHA256 c5d1c7b7c77667d607d31ae88c77169c43565690d4323eb30e36c6861e81edec
        • MD5 SHA1 SHA512 SSDEEP

        mstsca.exe

        • Path C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        • Size 18KB
        • SHA256 a66db7bf106e82d3d811d6f135b238c6694e5cc858a8bdc7c857cd539cbd2738
        • MD5 SHA1 SHA512 SSDEEP

        memory/168-1-0x0000000003060000-0x00000000030F9000-memory.dmp

        memory/168-3-0x0000000004960000-0x0000000004A7B000-memory.dmp

        memory/220-17-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/220-6-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/220-5-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/220-4-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/220-2-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/356-34-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/356-29-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/356-30-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/356-24-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/356-36-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/356-37-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/356-23-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/356-44-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/356-46-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/356-22-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/592-48-0x0000000000400000-0x0000000000406000-memory.dmp

        memory/592-53-0x0000000000400000-0x0000000000406000-memory.dmp

        memory/592-54-0x0000000000400000-0x0000000000406000-memory.dmp

        memory/744-109-0x0000000000410000-0x0000000000411000-memory.dmp

        memory/1524-21-0x0000000002F90000-0x0000000003031000-memory.dmp

        memory/2092-127-0x0000000000820000-0x0000000000920000-memory.dmp

        memory/2240-62-0x0000000000A60000-0x0000000000B60000-memory.dmp

        memory/2480-149-0x0000000000970000-0x0000000000A70000-memory.dmp

        memory/3192-106-0x0000000000A2E000-0x0000000000A3E000-memory.dmp

        memory/4032-52-0x00000000001F0000-0x00000000001F4000-memory.dmp

        memory/4032-50-0x0000000000830000-0x0000000000930000-memory.dmp

        memory/4684-85-0x00000000008A0000-0x00000000009A0000-memory.dmp