Analysis

  • max time kernel
    297s
  • max time network
    239s
  • platform
    windows10-1703_x64
  • resource
    win10-20231220-en
  • resource tags

    arch:x64arch:x86image:win10-20231220-enlocale:en-usos:windows10-1703-x64system
  • submitted
    14/01/2024, 22:25

General

  • Target
    c02005305c2ccc9e74c9a43ba13aadaf32b07e6af5b1620172ef47ee798fc9a6.exe
  • Size 810KB
  • Sample240114-2b7qqaecg6
  • 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
  • Executes dropped EXE 2 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 3 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of WriteProcessMemory 39 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:2156
    • 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:3620
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\445b27b3-d7d1-4b34-8bdb-13c9cd7dcdfa" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:1412
      • 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:3080
        • C:\Users\Admin\AppData\Local\Temp\c02005305c2ccc9e74c9a43ba13aadaf32b07e6af5b1620172ef47ee798fc9a6.exe
          "C:\Users\Admin\AppData\Local\Temp\c02005305c2ccc9e74c9a43ba13aadaf32b07e6af5b1620172ef47ee798fc9a6.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:1788
          • C:\Users\Admin\AppData\Local\79f551c3-e1a2-41e6-a616-6469460e31f0\build2.exe
            "C:\Users\Admin\AppData\Local\79f551c3-e1a2-41e6-a616-6469460e31f0\build2.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:3852
  • C:\Users\Admin\AppData\Local\79f551c3-e1a2-41e6-a616-6469460e31f0\build2.exe
    "C:\Users\Admin\AppData\Local\79f551c3-e1a2-41e6-a616-6469460e31f0\build2.exe"
    1⤵
    • Executes dropped EXE
    PID:532
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 532 -s 1864
      2⤵
      • Program crash
      PID:5012

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\Content\24BD96D5497F70B3F510A6B53CD43F3E_3A89246FB90C5EE6620004F1AE0EB0EA
        • Size 1KB
        • SHA256 0da3f6452b91947ed4ad5e11a34cb348a7da0276e2ee8f8f27d5f3b3987dd1bd
        • 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 97b664062a4882896e4df7071dc5e844da2415cce3b114086e45c6be8b17b5fe
        • MD5 SHA1 SHA512

        CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

        • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
        • Size 392B
        • SHA256 d20083343cf703ef1871a31a8936e0fa219394d0dffbe5583b2e1cc8b0294bd5
        • MD5 SHA1 SHA512

        c02005305c2ccc9e74c9a43ba13aadaf32b07e6af5b1620172ef47ee798fc9a6.exe

        • Path C:\Users\Admin\AppData\Local\445b27b3-d7d1-4b34-8bdb-13c9cd7dcdfa\c02005305c2ccc9e74c9a43ba13aadaf32b07e6af5b1620172ef47ee798fc9a6.exe
        • Size 1KB
        • SHA256 372b2c78bc949cf83d0af57d1efed44dbb657251836362c216498875ffd252f2
        • MD5 SHA1 SHA512

        build2.exe

        • Path C:\Users\Admin\AppData\Local\79f551c3-e1a2-41e6-a616-6469460e31f0\build2.exe
        • Size 227KB
        • SHA256 75cc156a4b8c94fccc0de0b848f3b94f5591a94a261d14009db1686ce3d54785
        • MD5 SHA1 SHA512 SSDEEP

        build2.exe

        • Path C:\Users\Admin\AppData\Local\79f551c3-e1a2-41e6-a616-6469460e31f0\build2.exe
        • Size 294KB
        • SHA256 e0d6c51df144a7a04b4cd5fbcd5d648c999418aedae357c161e1f818746349fb
        • MD5 SHA1 SHA512 SSDEEP

        build2.exe

        • Path C:\Users\Admin\AppData\Local\79f551c3-e1a2-41e6-a616-6469460e31f0\build2.exe
        • Size 137KB
        • SHA256 98d7524c5cae301073a5b2dc83ee3f3094537b49d0d8bfad31e0e1657645c739
        • MD5 SHA1 SHA512 SSDEEP

        memory/532-51-0x0000000000400000-0x000000000065E000-memory.dmp

        memory/532-39-0x0000000000400000-0x000000000065E000-memory.dmp

        memory/532-43-0x0000000000400000-0x000000000065E000-memory.dmp

        memory/532-45-0x0000000000400000-0x000000000065E000-memory.dmp

        memory/1788-24-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1788-54-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1788-29-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1788-23-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1788-57-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1788-21-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1788-30-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1788-56-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1788-52-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1788-46-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/1788-55-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/2156-2-0x00000000026A0000-0x00000000027BB000-memory.dmp

        memory/2156-1-0x0000000002600000-0x0000000002698000-memory.dmp

        memory/3080-22-0x0000000002490000-0x0000000002521000-memory.dmp

        memory/3620-3-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3620-4-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3620-5-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3620-6-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3620-17-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3852-44-0x00000000006F0000-0x000000000073B000-memory.dmp

        memory/3852-42-0x0000000000520000-0x0000000000620000-memory.dmp

        memory/3852-59-0x00000000006F0000-0x000000000073B000-memory.dmp