Analysis

  • max time kernel
    15s
  • max time network
    300s
  • platform
    windows10-1703_x64
  • resource
    win10-20231220-en
  • resource tags

    arch:x64arch:x86image:win10-20231220-enlocale:en-usos:windows10-1703-x64system
  • submitted
    15/01/2024, 04:57

General

  • Target
    c02005305c2ccc9e74c9a43ba13aadaf32b07e6af5b1620172ef47ee798fc9a6.exe
  • Size 810KB
  • Sample240115-flacbaagb9
  • SHA256 c02005305c2ccc9e74c9a43ba13aadaf32b07e6af5b1620172ef47ee798fc9a6
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • djvu

C2
  • http://zexeq.com/test1/get.php

Attributes
  • extension

    .cdwe

  • offline_id

    dSwr1XNNi5cIitB5eDPbMANcusB1dWGDB8ToUnt1

  • payload_url

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

    http://zexeq.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-e21iz7dS58 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: 0842ASdw

rsa_pubkey.plain

Signatures

  • Detect Vidar Stealer 5 IoCs
  • Detected Djvu ransomware 17 IoCs
  • Djvu Ransomware

    Ransomware which is a variant of the STOP family.

  • Vidar

    Vidar is an infostealer based on Arkei stealer.

  • Downloads MZ/PE file
  • 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 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\c02005305c2ccc9e74c9a43ba13aadaf32b07e6af5b1620172ef47ee798fc9a6.exe
    "C:\Users\Admin\AppData\Local\Temp\c02005305c2ccc9e74c9a43ba13aadaf32b07e6af5b1620172ef47ee798fc9a6.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:4552
    • C:\Users\Admin\AppData\Local\Temp\c02005305c2ccc9e74c9a43ba13aadaf32b07e6af5b1620172ef47ee798fc9a6.exe
      "C:\Users\Admin\AppData\Local\Temp\c02005305c2ccc9e74c9a43ba13aadaf32b07e6af5b1620172ef47ee798fc9a6.exe"
      2⤵
      • Adds Run key to start application
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:1600
      • C:\Users\Admin\AppData\Local\Temp\c02005305c2ccc9e74c9a43ba13aadaf32b07e6af5b1620172ef47ee798fc9a6.exe
        "C:\Users\Admin\AppData\Local\Temp\c02005305c2ccc9e74c9a43ba13aadaf32b07e6af5b1620172ef47ee798fc9a6.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4580
        • C:\Users\Admin\AppData\Local\Temp\c02005305c2ccc9e74c9a43ba13aadaf32b07e6af5b1620172ef47ee798fc9a6.exe
          "C:\Users\Admin\AppData\Local\Temp\c02005305c2ccc9e74c9a43ba13aadaf32b07e6af5b1620172ef47ee798fc9a6.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
            PID:3132
            • C:\Users\Admin\AppData\Local\2c5f7717-a7ff-4232-861e-a2ccff4a23d9\build2.exe
              "C:\Users\Admin\AppData\Local\2c5f7717-a7ff-4232-861e-a2ccff4a23d9\build2.exe"
              5⤵
                PID:96
          • C:\Windows\SysWOW64\icacls.exe
            icacls "C:\Users\Admin\AppData\Local\416d2e1d-2dd6-4f3a-b064-310d6b5ad152" /deny *S-1-1-0:(OI)(CI)(DE,DC)
            3⤵
            • Modifies file permissions
            PID:4672
      • C:\Users\Admin\AppData\Local\2c5f7717-a7ff-4232-861e-a2ccff4a23d9\build2.exe
        "C:\Users\Admin\AppData\Local\2c5f7717-a7ff-4232-861e-a2ccff4a23d9\build2.exe"
        1⤵
          PID:3748
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3748 -s 2072
            2⤵
            • Program crash
            PID:3744

        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 ee8aeed77dd9f1631fa75845214d75bfe04951a61892410ee369035e13fd14c6
              • 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 9fda12ec055361c8627ea1c395e56f0a1c565644b092246f7185f512e74deaa8
              • MD5 SHA1 SHA512

              CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

              • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
              • Size 392B
              • SHA256 10f43335c548539b9b0bc6bf5be1b4b6f02aaf9b32e750164c19375a3b959868
              • MD5 SHA1 SHA512

              build2.exe

              • Path C:\Users\Admin\AppData\Local\2c5f7717-a7ff-4232-861e-a2ccff4a23d9\build2.exe
              • Size 63KB
              • SHA256 a8684e5117c2ed30f5cf10c3cd443f2ef68a8a186e35a819fb476a855f5c4737
              • MD5 SHA1 SHA512 SSDEEP

              build2.exe

              • Path C:\Users\Admin\AppData\Local\2c5f7717-a7ff-4232-861e-a2ccff4a23d9\build2.exe
              • Size 5KB
              • SHA256 14e7bbac54197a297bc2820c9192dc7e6bfe04bf79a6546e2f5abd81a97d4ad3
              • MD5 SHA1 SHA512 SSDEEP

              build2.exe

              • Path C:\Users\Admin\AppData\Local\2c5f7717-a7ff-4232-861e-a2ccff4a23d9\build2.exe
              • Size 1KB
              • SHA256 caf7e3d57333c9367bcbeee6fa78a6dbd5ea796f138c9b384a96940de47fdee2
              • MD5 SHA1 SHA512

              c02005305c2ccc9e74c9a43ba13aadaf32b07e6af5b1620172ef47ee798fc9a6.exe

              • Path C:\Users\Admin\AppData\Local\416d2e1d-2dd6-4f3a-b064-310d6b5ad152\c02005305c2ccc9e74c9a43ba13aadaf32b07e6af5b1620172ef47ee798fc9a6.exe
              • Size 44KB
              • SHA256 cca8b742fdb16caf328bf0d64f3435cd6667be81674a7b57dcff3a698216f241
              • MD5 SHA1 SHA512 SSDEEP

              memory/96-40-0x00000000005B0000-0x00000000006B0000-memory.dmp

              memory/96-43-0x00000000007F0000-0x000000000083B000-memory.dmp

              memory/1600-17-0x0000000000400000-0x0000000000537000-memory.dmp

              memory/1600-1-0x0000000000400000-0x0000000000537000-memory.dmp

              memory/1600-2-0x0000000000400000-0x0000000000537000-memory.dmp

              memory/1600-6-0x0000000000400000-0x0000000000537000-memory.dmp

              memory/1600-5-0x0000000000400000-0x0000000000537000-memory.dmp

              memory/3132-30-0x0000000000400000-0x0000000000537000-memory.dmp

              memory/3132-46-0x0000000000400000-0x0000000000537000-memory.dmp

              memory/3132-29-0x0000000000400000-0x0000000000537000-memory.dmp

              memory/3132-22-0x0000000000400000-0x0000000000537000-memory.dmp

              memory/3132-23-0x0000000000400000-0x0000000000537000-memory.dmp

              memory/3132-59-0x0000000000400000-0x0000000000537000-memory.dmp

              memory/3132-54-0x0000000000400000-0x0000000000537000-memory.dmp

              memory/3132-24-0x0000000000400000-0x0000000000537000-memory.dmp

              memory/3132-56-0x0000000000400000-0x0000000000537000-memory.dmp

              memory/3132-57-0x0000000000400000-0x0000000000537000-memory.dmp

              memory/3748-39-0x0000000000400000-0x000000000065E000-memory.dmp

              memory/3748-52-0x0000000000400000-0x000000000065E000-memory.dmp

              memory/3748-44-0x0000000000400000-0x000000000065E000-memory.dmp

              memory/3748-45-0x0000000000400000-0x000000000065E000-memory.dmp

              memory/4552-4-0x00000000026E0000-0x00000000027FB000-memory.dmp

              memory/4552-47-0x00000000026E0000-0x00000000027FB000-memory.dmp

              memory/4552-3-0x0000000000960000-0x00000000009FD000-memory.dmp

              memory/4580-21-0x0000000000AF0000-0x0000000000B8B000-memory.dmp