Analysis

  • max time kernel
    193s
  • max time network
    204s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    20/10/2022, 16:01

General

  • Target
    0284ef0c5e906d8c6f03393d9cd82e63.exe
  • Size 713KB
  • Sample221020-tf7yaacdbm
  • SHA256 ec9d5791f02cc5b005e9bb3619092d1645c8c29b50a34ed23381c3514cf512bf
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Extracted

Family
  • djvu

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

Attributes
  • extension

    .tuis

  • offline_id

    Uz66zEbmA32arcxwT81zZhkb23026oHz5iSp8qt1

  • payload_url

    http://rgyui.top/dl/build2.exe

    http://winnlinne.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-o7UXxOstmw Price of private key and decrypt software is $980. Discount 50% available if you contact us first 72 hours, that's price for you is $490. 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: 0582Jhyjd

rsa_pubkey.plain

Extracted

Family
  • vidar

Version
  • 55.1

Botnet
  • 517

C2
  • https://t.me/tg_privatetalk

  • https://nerdculture.de/@yixehi33

Attributes
  • profile_id

    517

Signatures

  • Detected Djvu ransomware 9 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 4 IoCs
  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Loads dropped DLL 3 IoCs
  • Modifies file permissions 1 TTPs 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Accesses 2FA software files, possible credential harvesting 2 TTPs
  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • 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). Likely ransomware behaviour.

  • Checks processor information in registry 2 TTPs 2 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • 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 6 IoCs
  • Suspicious use of WriteProcessMemory 46 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\0284ef0c5e906d8c6f03393d9cd82e63.exe
    "C:\Users\Admin\AppData\Local\Temp\0284ef0c5e906d8c6f03393d9cd82e63.exe"
    1⤵
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:4932
    • C:\Users\Admin\AppData\Local\Temp\0284ef0c5e906d8c6f03393d9cd82e63.exe
      "C:\Users\Admin\AppData\Local\Temp\0284ef0c5e906d8c6f03393d9cd82e63.exe"
      2⤵
      • Checks computer location settings
      • Adds Run key to start application
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of WriteProcessMemory
      PID:4436
      • C:\Windows\SysWOW64\icacls.exe
        icacls "C:\Users\Admin\AppData\Local\0e023b19-66a8-42a2-a04f-3137ec23cc7d" /deny *S-1-1-0:(OI)(CI)(DE,DC)
        3⤵
        • Modifies file permissions
        PID:1608
      • C:\Users\Admin\AppData\Local\Temp\0284ef0c5e906d8c6f03393d9cd82e63.exe
        "C:\Users\Admin\AppData\Local\Temp\0284ef0c5e906d8c6f03393d9cd82e63.exe" --Admin IsNotAutoStart IsNotTask
        3⤵
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3700
        • C:\Users\Admin\AppData\Local\Temp\0284ef0c5e906d8c6f03393d9cd82e63.exe
          "C:\Users\Admin\AppData\Local\Temp\0284ef0c5e906d8c6f03393d9cd82e63.exe" --Admin IsNotAutoStart IsNotTask
          4⤵
          • Checks computer location settings
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:3020
          • C:\Users\Admin\AppData\Local\bab72b1b-69a3-4e85-9f09-a4448501a707\build2.exe
            "C:\Users\Admin\AppData\Local\bab72b1b-69a3-4e85-9f09-a4448501a707\build2.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of SetThreadContext
            • Suspicious use of WriteProcessMemory
            PID:484
            • C:\Users\Admin\AppData\Local\bab72b1b-69a3-4e85-9f09-a4448501a707\build2.exe
              "C:\Users\Admin\AppData\Local\bab72b1b-69a3-4e85-9f09-a4448501a707\build2.exe"
              6⤵
              • Executes dropped EXE
              • Loads dropped DLL
              • Checks processor information in registry
              • Suspicious behavior: EnumeratesProcesses
              PID:744
          • C:\Users\Admin\AppData\Local\bab72b1b-69a3-4e85-9f09-a4448501a707\build3.exe
            "C:\Users\Admin\AppData\Local\bab72b1b-69a3-4e85-9f09-a4448501a707\build3.exe"
            5⤵
            • Executes dropped EXE
            • Suspicious use of WriteProcessMemory
            PID:3784
            • 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"
              6⤵
              • Creates scheduled task(s)
              PID:4856
  • 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 WriteProcessMemory
    PID:3736
    • 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"
      2⤵
      • Creates scheduled task(s)
      PID:4828

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        mozglue.dll

        • Path C:\ProgramData\mozglue.dll
        • Size 593KB
        • SHA256 ba06a6ee0b15f5be5c4e67782eec8b521e36c107a329093ec400fe0404eb196a
        • MD5 SHA1 SHA512 SSDEEP

        nss3.dll

        • Path C:\ProgramData\nss3.dll
        • Size 2.0MB
        • SHA256 ac5c92fe6c51cfa742e475215b83b3e11a4379820043263bf50d4068686c6fa5
        • MD5 SHA1 SHA512 SSDEEP

        sqlite3.dll

        • Path C:\ProgramData\sqlite3.dll
        • Size 1.1MB
        • SHA256 4841020c8bd06b08fde6e44cbe2e2ab33439e1c8368e936ec5b00dc0584f7260
        • MD5 SHA1 SHA512 SSDEEP

        0284ef0c5e906d8c6f03393d9cd82e63.exe

        • Path C:\Users\Admin\AppData\Local\0e023b19-66a8-42a2-a04f-3137ec23cc7d\0284ef0c5e906d8c6f03393d9cd82e63.exe
        • Size 713KB
        • SHA256 ec9d5791f02cc5b005e9bb3619092d1645c8c29b50a34ed23381c3514cf512bf
        • MD5 SHA1 SHA512 SSDEEP

        build2.exe

        • Path C:\Users\Admin\AppData\Local\bab72b1b-69a3-4e85-9f09-a4448501a707\build2.exe
        • Size 325KB
        • SHA256 8ecc0426ea37a5c9e59d00b4fde1508175a950372ec3870965f1e527634b3419
        • MD5 SHA1 SHA512 SSDEEP

        build2.exe

        • Path C:\Users\Admin\AppData\Local\bab72b1b-69a3-4e85-9f09-a4448501a707\build2.exe
        • Size 325KB
        • SHA256 8ecc0426ea37a5c9e59d00b4fde1508175a950372ec3870965f1e527634b3419
        • MD5 SHA1 SHA512 SSDEEP

        build2.exe

        • Path C:\Users\Admin\AppData\Local\bab72b1b-69a3-4e85-9f09-a4448501a707\build2.exe
        • Size 325KB
        • SHA256 8ecc0426ea37a5c9e59d00b4fde1508175a950372ec3870965f1e527634b3419
        • MD5 SHA1 SHA512 SSDEEP

        build3.exe

        • Path C:\Users\Admin\AppData\Local\bab72b1b-69a3-4e85-9f09-a4448501a707\build3.exe
        • Size 9KB
        • SHA256 8d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
        • MD5 SHA1 SHA512 SSDEEP

        build3.exe

        • Path C:\Users\Admin\AppData\Local\bab72b1b-69a3-4e85-9f09-a4448501a707\build3.exe
        • Size 9KB
        • SHA256 8d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
        • MD5 SHA1 SHA512 SSDEEP

        mstsca.exe

        • Path C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        • Size 9KB
        • SHA256 8d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
        • MD5 SHA1 SHA512 SSDEEP

        mstsca.exe

        • Path C:\Users\Admin\AppData\Roaming\Microsoft\Network\mstsca.exe
        • Size 9KB
        • SHA256 8d7f0e6b6877bdfb9f4531afafd0451f7d17f0ac24e2f2427e9b4ecc5452b9f0
        • MD5 SHA1 SHA512 SSDEEP

        memory/484-156-0x00000000008B5000-0x00000000008DD000-memory.dmp

        memory/484-158-0x0000000002240000-0x0000000002284000-memory.dmp

        memory/744-160-0x0000000000400000-0x0000000000458000-memory.dmp

        memory/744-159-0x0000000000400000-0x0000000000458000-memory.dmp

        memory/744-157-0x0000000000400000-0x0000000000458000-memory.dmp

        memory/744-168-0x0000000000400000-0x0000000000458000-memory.dmp

        memory/744-154-0x0000000000400000-0x0000000000458000-memory.dmp

        memory/3020-149-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3020-147-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3020-145-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/3700-146-0x00000000020BF000-0x0000000002151000-memory.dmp

        memory/4436-138-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4436-134-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4436-142-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4436-133-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4436-137-0x0000000000400000-0x0000000000537000-memory.dmp

        memory/4932-135-0x0000000002227000-0x00000000022B9000-memory.dmp

        memory/4932-136-0x00000000023B0000-0x00000000024CB000-memory.dmp