Analysis

  • max time kernel
    143s
  • max time network
    147s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    06/01/2024, 20:13

General

  • Target
    704c5f63a1f5ee442b0fb943cb222f1032732f9f651917d51445ac36c8939a15.exe
  • Size 700KB
  • Sample240106-yzehasgce6
  • SHA256 704c5f63a1f5ee442b0fb943cb222f1032732f9f651917d51445ac36c8939a15
  • 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
  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Executes dropped EXE 4 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 4 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Program crash 1 IoCs
  • Creates scheduled task(s) 1 TTPs 1 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 4 IoCs
  • Suspicious use of WriteProcessMemory 54 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\704c5f63a1f5ee442b0fb943cb222f1032732f9f651917d51445ac36c8939a15.exe
    "C:\Users\Admin\AppData\Local\Temp\704c5f63a1f5ee442b0fb943cb222f1032732f9f651917d51445ac36c8939a15.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:3408
    • C:\Users\Admin\AppData\Local\Temp\704c5f63a1f5ee442b0fb943cb222f1032732f9f651917d51445ac36c8939a15.exe
      "C:\Users\Admin\AppData\Local\Temp\704c5f63a1f5ee442b0fb943cb222f1032732f9f651917d51445ac36c8939a15.exe"
      2⤵
      • Checks computer location settings
      • Adds Run key to start application
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:2392
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\020855ee-53de-4071-a599-e9a881a9f2b8" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:3872
      • C:\Users\Admin\AppData\Local\Temp\704c5f63a1f5ee442b0fb943cb222f1032732f9f651917d51445ac36c8939a15.exe
        "C:\Users\Admin\AppData\Local\Temp\704c5f63a1f5ee442b0fb943cb222f1032732f9f651917d51445ac36c8939a15.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4548
        • C:\Users\Admin\AppData\Local\Temp\704c5f63a1f5ee442b0fb943cb222f1032732f9f651917d51445ac36c8939a15.exe
          "C:\Users\Admin\AppData\Local\Temp\704c5f63a1f5ee442b0fb943cb222f1032732f9f651917d51445ac36c8939a15.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Checks computer location settings
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:1228
          • C:\Users\Admin\AppData\Local\f595df76-91b8-492d-8854-44406597cead\build2.exe
            "C:\Users\Admin\AppData\Local\f595df76-91b8-492d-8854-44406597cead\build2.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:4680
            • C:\Users\Admin\AppData\Local\f595df76-91b8-492d-8854-44406597cead\build2.exe
              "C:\Users\Admin\AppData\Local\f595df76-91b8-492d-8854-44406597cead\build2.exe"
              6⤵
              • Executes dropped EXE
              PID:1648
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -u -p 1648 -s 2036
                7⤵
                • Program crash
                PID:1492
          • C:\Users\Admin\AppData\Local\f595df76-91b8-492d-8854-44406597cead\build3.exe
            "C:\Users\Admin\AppData\Local\f595df76-91b8-492d-8854-44406597cead\build3.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:552
            • C:\Users\Admin\AppData\Local\f595df76-91b8-492d-8854-44406597cead\build3.exe
              "C:\Users\Admin\AppData\Local\f595df76-91b8-492d-8854-44406597cead\build3.exe"
              6⤵
              • Executes dropped EXE
              • Suspicious use of WriteProcessMemory
              PID:4768
              • 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:904
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 1648 -ip 1648
    1⤵
      PID:1976

    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 c94853517feb843767fd405e5bb1a7e01b8e284e39072bf5fd8ff4e7cc47b8b9
          • 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 3671f954f9f9638fe74622540a9ba5120d9b144e3cfa944d4ee15beca56618eb
          • MD5 SHA1 SHA512

          CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

          • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
          • Size 392B
          • SHA256 5ada35eec016c9d7a125e1a564a214fb07e42efa5a7fe1c650c77ad81ed36561
          • MD5 SHA1 SHA512

          704c5f63a1f5ee442b0fb943cb222f1032732f9f651917d51445ac36c8939a15.exe

          • Path C:\Users\Admin\AppData\Local\020855ee-53de-4071-a599-e9a881a9f2b8\704c5f63a1f5ee442b0fb943cb222f1032732f9f651917d51445ac36c8939a15.exe
          • Size 700KB
          • SHA256 704c5f63a1f5ee442b0fb943cb222f1032732f9f651917d51445ac36c8939a15
          • MD5 SHA1 SHA512 SSDEEP

          build2.exe

          • Path C:\Users\Admin\AppData\Local\f595df76-91b8-492d-8854-44406597cead\build2.exe
          • Size 247KB
          • SHA256 5719504e2f4e976c8ce6fbfda399b80273e783ff05f61dfd1f1bd4737f0bde8a
          • MD5 SHA1 SHA512 SSDEEP

          build3.exe

          • Path C:\Users\Admin\AppData\Local\f595df76-91b8-492d-8854-44406597cead\build3.exe
          • Size 299KB
          • SHA256 fef2c8ca07c500e416fd7700a381c39899ee26ce1119f62e7c65cf922ce8b408
          • MD5 SHA1 SHA512 SSDEEP

          memory/552-87-0x0000000000880000-0x0000000000884000-memory.dmp

          memory/552-85-0x00000000008CD000-0x00000000008DD000-memory.dmp

          memory/1228-35-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/1228-37-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/1228-22-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/1228-20-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/1228-66-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/1228-21-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/1228-36-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/1228-28-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/1228-27-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/1228-32-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/1228-34-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/1648-69-0x0000000000400000-0x000000000063D000-memory.dmp

          memory/1648-76-0x0000000000400000-0x000000000063D000-memory.dmp

          memory/1648-75-0x0000000000400000-0x000000000063D000-memory.dmp

          memory/1648-74-0x0000000000400000-0x000000000063D000-memory.dmp

          memory/2392-4-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/2392-5-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/2392-15-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/2392-6-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/2392-3-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/3408-1-0x00000000025B0000-0x000000000264B000-memory.dmp

          memory/3408-2-0x0000000002650000-0x000000000276B000-memory.dmp

          memory/4548-18-0x00000000023B0000-0x000000000244C000-memory.dmp

          memory/4680-73-0x0000000000AC0000-0x0000000000AEA000-memory.dmp

          memory/4680-70-0x0000000000B80000-0x0000000000C80000-memory.dmp

          memory/4768-82-0x0000000000400000-0x0000000000406000-memory.dmp

          memory/4768-86-0x0000000000400000-0x0000000000406000-memory.dmp

          memory/4768-89-0x0000000000400000-0x0000000000406000-memory.dmp