Overview

overview

10

Static

static

3

c0103fbffe...92.exe

windows10-2004-x64

10

c0103fbffe...92.exe

windows11-ltsc_2024-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    141s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260911-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    17/10/2026, 04:37

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General

  • Target
    c0103fbffe7779bf42d578035f607681620589d65c20e3f7c9d34c509b07cd92.exe
  • Size 11.9MB
  • Sample261017-e81bksdb46
  • SHA256 c0103fbffe7779bf42d578035f607681620589d65c20e3f7c9d34c509b07cd92
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
adwarebackdoordonutloadervalleyrat_s2loaderpersistenceransomwarespyware

Malware Config

Extracted

Family

  • valleyrat_s2

Version

  • 1.0

C2

  • 103.82.54.126:4892

Attributes
  • campaign_date

    2026.10.16

Extracted

Family

  • valleyrat_s2

C2

  • 103.82.54.126:4892

Signatures

  • Family: DonutLoader

    DonutLoader is a position-independent code that enables in-memory execution of VBScript, JScript, EXE, DLL files and dotNET assemblies.

    loaderdonutloader
  • Family: ValleyRat

    ValleyRat stage2 is a backdoor written in C++.

    backdoorvalleyrat_s2
  • Detects DonutLoader 1 IoCs
    loader
  • Detects ValleyRAT payload 4 IoCs
  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 7 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
    persistence
  • Enumerates connected drives 3 TTPs 22 IoCs

    Attempts to read the root path of hard drives other than the default C: drive.

  • Modifies Internet Explorer settings 1 TTPs 2 IoCs
    adwarespyware
  • Modifies registry class 18 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 64 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 4 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

    persistence
  • Uses Volume Shadow Copy WMI provider

    The Volume Shadow Copy service is used to manage backups/snapshots.

    ransomware
  • Uses Volume Shadow Copy service COM API

    The Volume Shadow Copy service is used to manage backups/snapshots.

    ransomware

Processes

  • C:\Windows\explorer.exe
    explorer.exe /LOADSAVEDWINDOWS
    1⤵
    • Adds Run key to start application
    • Enumerates connected drives
    • Modifies Internet Explorer settings
    • Modifies registry class
    • Suspicious behavior: AddClipboardFormatListener
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: GetForegroundWindowSpam
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:572
    • C:\Users\Admin\AppData\Local\Temp\c0103fbffe7779bf42d578035f607681620589d65c20e3f7c9d34c509b07cd92.exe
      "C:\Users\Admin\AppData\Local\Temp\c0103fbffe7779bf42d578035f607681620589d65c20e3f7c9d34c509b07cd92.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2412
      • C:\Users\Admin\AppData\Local\Temp\c0103fbffe7779bf42d578035f607681620589d65c20e3f7c9d34c509b07cd92.exe
        "C:\Users\Admin\AppData\Local\Temp\c0103fbffe7779bf42d578035f607681620589d65c20e3f7c9d34c509b07cd92.exe"
        3⤵
        • Loads dropped DLL
        • Suspicious use of WriteProcessMemory
        PID:2752
        • C:\Windows-SysApp\cloudmusic_reporter.exe
          C:\Windows-SysApp\cloudmusic_reporter.exe
          4⤵
          • Executes dropped EXE
          • Loads dropped DLL
          • Adds Run key to start application
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of WriteProcessMemory
          PID:4656
  • C:\Windows-SysApp\cloudmusic_reporter.exe
    C:\Windows-SysApp\cloudmusic_reporter.exe
    1⤵
    • Executes dropped EXE
    • Loads dropped DLL
    PID:2808
  • C:\Windows\explorer.exe
    C:\Windows\explorer.exe
    1⤵
    • Modifies registry class
    PID:4364
  • C:\Windows\system32\svchost.exe
    C:\Windows\system32\svchost.exe -k GPSvcGroup
    1⤵
      PID:1220

    Network

          MITRE ATT&CK Enterprise v16

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          VCRUNTIME140.dll
          • Path C:\Users\Admin\AppData\Local\Temp\_MEI0000096c2\VCRUNTIME140.dll
          • Size 174KB
          • SHA256 d1f4225df2cd877dbf130d5668a021dce3f94118455ff5ec952061c30afc9ce7
          • MD5 SHA1 SHA512 SSDEEP TLSH
          Submit Download

          _bz2.pyd
          • Path C:\Users\Admin\AppData\Local\Temp\_MEI0000096c2\_bz2.pyd
          • Size 84KB
          • SHA256 c8d0e5b1b394597396e3eb04dc73cb26679bbfb9762e7b64332bbd63af385801
          • MD5 SHA1 SHA512 SSDEEP TLSH
          Submit Download

          _lzma.pyd
          • Path C:\Users\Admin\AppData\Local\Temp\_MEI0000096c2\_lzma.pyd
          • Size 167KB
          • SHA256 717e15be558846375b5c7b93e9275c35147da744786514b3e7e56b7ef7d69b3f
          • MD5 SHA1 SHA512 SSDEEP TLSH
          Submit Download

          _zstd.pyd
          • Path C:\Users\Admin\AppData\Local\Temp\_MEI0000096c2\_zstd.pyd
          • Size 494KB
          • SHA256 49eda8c6a95c5b8e0373f880373fc52fab557c1b42e0336f374131cd999565b1
          • MD5 SHA1 SHA512 SSDEEP TLSH
          Submit Download

          base_library.zip
          • Path C:\Users\Admin\AppData\Local\Temp\_MEI0000096c2\base_library.zip
          • Size 1.4MB
          • SHA256 4e90eff5416346ef0afbf5295ad678d69754aaeec70db7bbdf39025c73529fe7
          • MD5 SHA1 SHA512 SSDEEP TLSH
          Submit Download

          python315.dll
          • Path C:\Users\Admin\AppData\Local\Temp\_MEI0000096c2\python315.dll
          • Size 7.5MB
          • SHA256 a302b823d1ca773c534c5692a8a7c6215b4ac93cfcda9fc7e1d3a10e3cdd0eef
          • MD5 SHA1 SHA512 SSDEEP TLSH
          Submit Download

          cloudmusic_reporter.exe
          • Path C:\Windows-SysApp\cloudmusic_reporter.exe
          • Size 2.7MB
          • SHA256 5b338b485b643c8c350a2693bbfcfb56b7b64dc2241c49d5eb807a170c600191
          • MD5 SHA1 SHA512 SSDEEP TLSH
          Submit Download

          libcurl.dll
          • Path C:\Windows-SysApp\libcurl.dll
          • Size 236KB
          • SHA256 b21b6dead2e5862295229e162394faf9ac8fe90b623e4ec68fd819ed7d412906
          • MD5 SHA1 SHA512 SSDEEP TLSH
          Submit Download

          pBfaIOT1o6Kj.bin
          • Path C:\Windows-SysApp\pBfaIOT1o6Kj.bin
          • Size 149KB
          • SHA256 5be972e302b216997108bf03a5fe69e535e33cd3599fa66e1fb1652ff551c7d0
          • MD5 SHA1 SHA512 SSDEEP TLSH
          Submit Download

          memory/572-34-0x0000000005890000-0x00000000058B6000-memory.dmp
          Download

          memory/572-38-0x0000000005BB0000-0x0000000005BD9000-memory.dmp
          Download

          memory/572-40-0x0000000003200000-0x0000000003201000-memory.dmp
          Download

          memory/572-39-0x00000000031E0000-0x00000000031E1000-memory.dmp
          Download

          memory/572-54-0x00000000178B0000-0x00000000178FE000-memory.dmp
          Download

          memory/572-55-0x00000000178B0000-0x00000000178FE000-memory.dmp
          Download

          memory/572-56-0x00000000178B0000-0x00000000178FE000-memory.dmp
          Download

          memory/572-57-0x00000000178B0000-0x00000000178FE000-memory.dmp
          Download