Analysis

  • max time kernel
    149s
  • max time network
    156s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    12/01/2024, 23:05

General

  • Target
    26bd4a40d12d5483b5cf8a0a2db0dddb151b0b3206079dcf2782834482a2c3b7.exe
  • Size 684KB
  • Sample240112-225daaffcr
  • SHA256 26bd4a40d12d5483b5cf8a0a2db0dddb151b0b3206079dcf2782834482a2c3b7
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • djvu

C2
  • http://zexeq.com/test1/get.php

Attributes
  • extension

    .cdqw

  • offline_id

    mMsRxMUuXypapZbGOAfxD9pczHmW8zVRP7Pgjwt1

  • 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-99MNqXMrdS 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: 0840ASdw

rsa_pubkey.plain

Signatures

  • Detect Vidar Stealer 5 IoCs
  • Detected Djvu ransomware 18 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 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\26bd4a40d12d5483b5cf8a0a2db0dddb151b0b3206079dcf2782834482a2c3b7.exe
    "C:\Users\Admin\AppData\Local\Temp\26bd4a40d12d5483b5cf8a0a2db0dddb151b0b3206079dcf2782834482a2c3b7.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:4556
    • C:\Users\Admin\AppData\Local\Temp\26bd4a40d12d5483b5cf8a0a2db0dddb151b0b3206079dcf2782834482a2c3b7.exe
      "C:\Users\Admin\AppData\Local\Temp\26bd4a40d12d5483b5cf8a0a2db0dddb151b0b3206079dcf2782834482a2c3b7.exe"
      2⤵
      • Checks computer location settings
      • Adds Run key to start application
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:4836
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\e3d34435-2f61-48c3-b95f-d469161890e3" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:1684
      • C:\Users\Admin\AppData\Local\Temp\26bd4a40d12d5483b5cf8a0a2db0dddb151b0b3206079dcf2782834482a2c3b7.exe
        "C:\Users\Admin\AppData\Local\Temp\26bd4a40d12d5483b5cf8a0a2db0dddb151b0b3206079dcf2782834482a2c3b7.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4784
        • C:\Users\Admin\AppData\Local\Temp\26bd4a40d12d5483b5cf8a0a2db0dddb151b0b3206079dcf2782834482a2c3b7.exe
          "C:\Users\Admin\AppData\Local\Temp\26bd4a40d12d5483b5cf8a0a2db0dddb151b0b3206079dcf2782834482a2c3b7.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Checks computer location settings
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:3076
          • C:\Users\Admin\AppData\Local\8df46cca-24f9-4ee0-8d85-1b5fbff29302\build2.exe
            "C:\Users\Admin\AppData\Local\8df46cca-24f9-4ee0-8d85-1b5fbff29302\build2.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:5084
            • C:\Users\Admin\AppData\Local\8df46cca-24f9-4ee0-8d85-1b5fbff29302\build2.exe
              "C:\Users\Admin\AppData\Local\8df46cca-24f9-4ee0-8d85-1b5fbff29302\build2.exe"
              6⤵
              • Executes dropped EXE
              PID:1416
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -u -p 1416 -s 2236
                7⤵
                • Program crash
                PID:1216
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 432 -p 1416 -ip 1416
    1⤵
      PID:5092

    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 5ef8b74df59ad2233b8d40cea334c416975a910ea76892cb3946016a5602aa73
          • 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 9b74ff5006f2221848deaf51ef368d125e8445b207f2375c9ff33bd5dc145ed0
          • MD5 SHA1 SHA512

          CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

          • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
          • Size 392B
          • SHA256 45223f4f01fe5260a85aca9b3a29d21878e47f27a78d6aa02348e19eb059bb74
          • MD5 SHA1 SHA512

          build2.exe

          • Path C:\Users\Admin\AppData\Local\8df46cca-24f9-4ee0-8d85-1b5fbff29302\build2.exe
          • Size 358KB
          • SHA256 26063c78e5418610471a9f3a00a155d7d1e5b29856e1979ba3bdc42681a871d0
          • MD5 SHA1 SHA512 SSDEEP

          26bd4a40d12d5483b5cf8a0a2db0dddb151b0b3206079dcf2782834482a2c3b7.exe

          • Path C:\Users\Admin\AppData\Local\e3d34435-2f61-48c3-b95f-d469161890e3\26bd4a40d12d5483b5cf8a0a2db0dddb151b0b3206079dcf2782834482a2c3b7.exe
          • Size 684KB
          • SHA256 26bd4a40d12d5483b5cf8a0a2db0dddb151b0b3206079dcf2782834482a2c3b7
          • MD5 SHA1 SHA512 SSDEEP

          memory/1416-59-0x0000000000400000-0x000000000065E000-memory.dmp

          memory/1416-46-0x0000000000400000-0x000000000065E000-memory.dmp

          memory/1416-50-0x0000000000400000-0x000000000065E000-memory.dmp

          memory/1416-49-0x0000000000400000-0x000000000065E000-memory.dmp

          memory/3076-23-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/3076-29-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/3076-57-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/3076-58-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/3076-51-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/3076-62-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/3076-30-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/3076-24-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/3076-31-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/3076-56-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/3076-54-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/3076-22-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/4556-1-0x0000000002570000-0x0000000002603000-memory.dmp

          memory/4556-2-0x0000000002720000-0x000000000283B000-memory.dmp

          memory/4784-20-0x0000000002570000-0x000000000260B000-memory.dmp

          memory/4836-17-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/4836-6-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/4836-5-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/4836-4-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/4836-3-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/5084-45-0x00000000006E0000-0x000000000072B000-memory.dmp

          memory/5084-44-0x0000000000470000-0x0000000000570000-memory.dmp