Analysis

  • max time kernel
    145s
  • max time network
    124s
  • platform
    windows11-21h2_x64
  • resource
    win11-20240221-en
  • resource tags

    arch:x64arch:x86image:win11-20240221-enlocale:en-usos:windows11-21h2-x64system
  • submitted
    02/04/2024, 14:06

General

  • Target
    9f75db29ddc1b59c65c9dfa7e413d0af21e1be62bda1897119281f086c100b6a.exe
  • Size 719KB
  • Sample240402-ree5rsce6x
  • SHA256 9f75db29ddc1b59c65c9dfa7e413d0af21e1be62bda1897119281f086c100b6a
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • djvu

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

Attributes
  • extension

    .uajs

  • offline_id

    Jx0i3k2ogR5cKxX1evmz0Ex7TUxOUlnbh2dvnIt1

  • payload_url

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

    http://sajdfue.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. Do not ask assistants from youtube and recovery data sites for help in recovering your data. They can use your free decryption quota and scam you. Our contact is emails in this text document only. You can get and look video overview decrypt tool: https://wetransfer.com/downloads/df01994dd8d37c2c33469922f8e7155a20240402134014/fd95b0 Price of private key and decrypt software is $999. Discount 50% available if you contact us first 72 hours, that's price for you is $499. 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: 0859PsawqS

rsa_pubkey.plain

Extracted

Family
  • vidar

C2
  • https://steamcommunity.com/profiles/76561199658817715

  • https://t.me/sa9ok

Attributes
  • user_agent

    Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36

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 8 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 6 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 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\9f75db29ddc1b59c65c9dfa7e413d0af21e1be62bda1897119281f086c100b6a.exe
    "C:\Users\Admin\AppData\Local\Temp\9f75db29ddc1b59c65c9dfa7e413d0af21e1be62bda1897119281f086c100b6a.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:1008
    • C:\Users\Admin\AppData\Local\Temp\9f75db29ddc1b59c65c9dfa7e413d0af21e1be62bda1897119281f086c100b6a.exe
      "C:\Users\Admin\AppData\Local\Temp\9f75db29ddc1b59c65c9dfa7e413d0af21e1be62bda1897119281f086c100b6a.exe"
      2⤵
      • Adds Run key to start application
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:2596
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\57a6a6ec-4b79-4093-bfc4-e056a56c53d9" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:3836
      • C:\Users\Admin\AppData\Local\Temp\9f75db29ddc1b59c65c9dfa7e413d0af21e1be62bda1897119281f086c100b6a.exe
        "C:\Users\Admin\AppData\Local\Temp\9f75db29ddc1b59c65c9dfa7e413d0af21e1be62bda1897119281f086c100b6a.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:480
        • C:\Users\Admin\AppData\Local\Temp\9f75db29ddc1b59c65c9dfa7e413d0af21e1be62bda1897119281f086c100b6a.exe
          "C:\Users\Admin\AppData\Local\Temp\9f75db29ddc1b59c65c9dfa7e413d0af21e1be62bda1897119281f086c100b6a.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:4568
          • C:\Users\Admin\AppData\Local\214450ca-4e36-42cb-9a72-107b3342a2e6\build2.exe
            "C:\Users\Admin\AppData\Local\214450ca-4e36-42cb-9a72-107b3342a2e6\build2.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:2920
            • C:\Users\Admin\AppData\Local\214450ca-4e36-42cb-9a72-107b3342a2e6\build2.exe
              "C:\Users\Admin\AppData\Local\214450ca-4e36-42cb-9a72-107b3342a2e6\build2.exe"
              6⤵
              • Executes dropped EXE
              PID:3424
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -u -p 3424 -s 2104
                7⤵
                • Program crash
                PID:3284
          • C:\Users\Admin\AppData\Local\214450ca-4e36-42cb-9a72-107b3342a2e6\build3.exe
            "C:\Users\Admin\AppData\Local\214450ca-4e36-42cb-9a72-107b3342a2e6\build3.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:3492
            • C:\Users\Admin\AppData\Local\214450ca-4e36-42cb-9a72-107b3342a2e6\build3.exe
              "C:\Users\Admin\AppData\Local\214450ca-4e36-42cb-9a72-107b3342a2e6\build3.exe"
              6⤵
              • Executes dropped EXE
              • Suspicious use of WriteProcessMemory
              PID:1988
              • 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:4616
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 3424 -ip 3424
    1⤵
      PID:4408
    • 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:4924
      • 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:4440
        • 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:3984
    • 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:3076
      • C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        2⤵
        • Executes dropped EXE
        PID:4980

    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 152415db33fa59517ba5f8460019b4e95c59255cd6541faa35b089d97bd039e1
          • 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 8aefcf4d17478fc01b7e053cdcc4de201b994e23286098f7faaa7fffbec5c575
          • MD5 SHA1 SHA512

          CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464

          • Path C:\Users\Admin\AppData\LocalLow\Microsoft\CryptnetUrlCache\MetaData\CAF4703619713E3F18D8A9D5D88D6288_F2DAF19C1F776537105D08FC8D978464
          • Size 392B
          • SHA256 ea47692dcba3d6aa03303e290b94b2752edc76c4048d2f606b3c0d6f98c54e65
          • MD5 SHA1 SHA512

          build2.exe

          • Path C:\Users\Admin\AppData\Local\214450ca-4e36-42cb-9a72-107b3342a2e6\build2.exe
          • Size 265KB
          • SHA256 2389dff2f3f5459ebb8110c01eeedee11ce0c75c3bb735f6f5f76f8a7bb6e9f6
          • MD5 SHA1 SHA512 SSDEEP

          build3.exe

          • Path C:\Users\Admin\AppData\Local\214450ca-4e36-42cb-9a72-107b3342a2e6\build3.exe
          • Size 299KB
          • SHA256 fef2c8ca07c500e416fd7700a381c39899ee26ce1119f62e7c65cf922ce8b408
          • MD5 SHA1 SHA512 SSDEEP

          9f75db29ddc1b59c65c9dfa7e413d0af21e1be62bda1897119281f086c100b6a.exe

          • Path C:\Users\Admin\AppData\Local\57a6a6ec-4b79-4093-bfc4-e056a56c53d9\9f75db29ddc1b59c65c9dfa7e413d0af21e1be62bda1897119281f086c100b6a.exe
          • Size 719KB
          • SHA256 9f75db29ddc1b59c65c9dfa7e413d0af21e1be62bda1897119281f086c100b6a
          • MD5 SHA1 SHA512 SSDEEP

          memory/480-22-0x0000000004922000-0x00000000049B4000-memory.dmp

          memory/1008-2-0x0000000004AF0000-0x0000000004C0B000-memory.dmp

          memory/1008-1-0x0000000004A40000-0x0000000004AE2000-memory.dmp

          memory/1988-81-0x0000000000400000-0x0000000000406000-memory.dmp

          memory/1988-84-0x0000000000410000-0x0000000000413000-memory.dmp

          memory/1988-78-0x0000000000400000-0x0000000000406000-memory.dmp

          memory/1988-83-0x0000000000400000-0x0000000000406000-memory.dmp

          memory/2596-4-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/2596-3-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/2596-6-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/2596-17-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/2596-5-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/2920-49-0x0000000000720000-0x0000000000820000-memory.dmp

          memory/2920-50-0x0000000002260000-0x0000000002295000-memory.dmp

          memory/3076-119-0x0000000000A30000-0x0000000000B30000-memory.dmp

          memory/3424-73-0x0000000000400000-0x0000000000648000-memory.dmp

          memory/3424-51-0x0000000000400000-0x0000000000648000-memory.dmp

          memory/3424-54-0x0000000000400000-0x0000000000648000-memory.dmp

          memory/3424-55-0x0000000000400000-0x0000000000648000-memory.dmp

          memory/3492-76-0x0000000000960000-0x0000000000A60000-memory.dmp

          memory/3492-77-0x0000000000940000-0x0000000000944000-memory.dmp

          memory/4568-23-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/4568-70-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/4568-37-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/4568-36-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/4568-34-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/4568-30-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/4568-29-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/4568-24-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/4568-87-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/4568-21-0x0000000000400000-0x0000000000537000-memory.dmp

          memory/4924-95-0x0000000000970000-0x0000000000A70000-memory.dmp

          memory/4924-103-0x0000000000970000-0x0000000000A70000-memory.dmp