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
    windows10-2004_x64
  • resource
    win10v2004-20260911-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260911-enlocale:en-usos:windows10-2004-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
adwarebackdoordefense_evasiondonutloadervalleyrat_s2loaderpersistenceprivilege_escalationransomwarespyware

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 4 IoCs
    adwarespyware
  • Modifies registry class 5 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 52 IoCs
  • Suspicious use of SetWindowsHookEx 3 IoCs
  • Suspicious use of UnmapMainImage 1 TTPs 1 IoCs
    defense_evasionprivilege_escalation
  • 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
    C:\Windows\Explorer.EXE
    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 SetWindowsHookEx
    • Suspicious use of UnmapMainImage
    • Suspicious use of WriteProcessMemory
    PID:3276
    • C:\Users\Admin\AppData\Local\Temp\c0103fbffe7779bf42d578035f607681620589d65c20e3f7c9d34c509b07cd92.exe
      "C:\Users\Admin\AppData\Local\Temp\c0103fbffe7779bf42d578035f607681620589d65c20e3f7c9d34c509b07cd92.exe"
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2352
      • 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:456
        • 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:4688
  • C:\Windows-SysApp\cloudmusic_reporter.exe
    C:\Windows-SysApp\cloudmusic_reporter.exe
    1⤵
    • Executes dropped EXE
    • Loads dropped DLL
    PID:5028
  • C:\Windows\explorer.exe
    C:\Windows\Explorer.EXE
    1⤵
    • Modifies registry class
    PID:3252

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        VCRUNTIME140.dll
        • Path C:\Users\Admin\AppData\Local\Temp\_MEI000009302\VCRUNTIME140.dll
        • Size 174KB
        • SHA256 d1f4225df2cd877dbf130d5668a021dce3f94118455ff5ec952061c30afc9ce7
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        _bz2.pyd
        • Path C:\Users\Admin\AppData\Local\Temp\_MEI000009302\_bz2.pyd
        • Size 84KB
        • SHA256 c8d0e5b1b394597396e3eb04dc73cb26679bbfb9762e7b64332bbd63af385801
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        _decimal.pyd
        • Path C:\Users\Admin\AppData\Local\Temp\_MEI000009302\_decimal.pyd
        • Size 319KB
        • SHA256 23a6c6fc500721d5f87334edb802617ecc0ab923430fd72bbcfa8d7873368f80
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        _hashlib.pyd
        • Path C:\Users\Admin\AppData\Local\Temp\_MEI000009302\_hashlib.pyd
        • Size 71KB
        • SHA256 65f921fdee1a34ef18a5635cd9cfea25f8e6650883be79a1a520d3721383eb3a
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        _lzma.pyd
        • Path C:\Users\Admin\AppData\Local\Temp\_MEI000009302\_lzma.pyd
        • Size 167KB
        • SHA256 717e15be558846375b5c7b93e9275c35147da744786514b3e7e56b7ef7d69b3f
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        _socket.pyd
        • Path C:\Users\Admin\AppData\Local\Temp\_MEI000009302\_socket.pyd
        • Size 86KB
        • SHA256 2ee21e2b37d78458454e81bf529128cb0c98f92254635f5265222647aa850787
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        _ssl.pyd
        • Path C:\Users\Admin\AppData\Local\Temp\_MEI000009302\_ssl.pyd
        • Size 192KB
        • SHA256 581bc1e1ce0522d2ddcdd6e4865fe47f1de9f7f52474e3950ddfc0c8dd966c5b
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        _zstd.pyd
        • Path C:\Users\Admin\AppData\Local\Temp\_MEI000009302\_zstd.pyd
        • Size 494KB
        • SHA256 49eda8c6a95c5b8e0373f880373fc52fab557c1b42e0336f374131cd999565b1
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        base_library.zip
        • Path C:\Users\Admin\AppData\Local\Temp\_MEI000009302\base_library.zip
        • Size 1.4MB
        • SHA256 4e90eff5416346ef0afbf5295ad678d69754aaeec70db7bbdf39025c73529fe7
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        libcrypto-3.dll
        • Path C:\Users\Admin\AppData\Local\Temp\_MEI000009302\libcrypto-3.dll
        • Size 5.7MB
        • SHA256 75495fe0e079ab00d49be740d3c710a0b94e3f74f9648cb7cc9f768fc7f52319
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        libssl-3.dll
        • Path C:\Users\Admin\AppData\Local\Temp\_MEI000009302\libssl-3.dll
        • Size 1.2MB
        • SHA256 8957182a9c385bfd9f3f790921de2ddc614cf91f99edbed4e9e5446a46504e32
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        python315.dll
        • Path C:\Users\Admin\AppData\Local\Temp\_MEI000009302\python315.dll
        • Size 7.5MB
        • SHA256 a302b823d1ca773c534c5692a8a7c6215b4ac93cfcda9fc7e1d3a10e3cdd0eef
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        select.pyd
        • Path C:\Users\Admin\AppData\Local\Temp\_MEI000009302\select.pyd
        • Size 32KB
        • SHA256 bcec7c662876364122be2d03b326d121a79dbc679210248a3e035de52a392631
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        unicodedata.pyd
        • Path C:\Users\Admin\AppData\Local\Temp\_MEI000009302\unicodedata.pyd
        • Size 735KB
        • SHA256 c5cfd858bdaa87e89ce1652739ced36addc62b73f97983dff9e50fc456a7c9e8
        • 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/3276-47-0x0000000002CE0000-0x0000000002D06000-memory.dmp
        Download

        memory/3276-49-0x0000000007C20000-0x0000000007C49000-memory.dmp
        Download

        memory/3276-50-0x0000000002930000-0x0000000002931000-memory.dmp
        Download

        memory/3276-51-0x0000000002B60000-0x0000000002B61000-memory.dmp
        Download

        memory/3276-53-0x0000000010DD0000-0x0000000010E1E000-memory.dmp
        Download

        memory/3276-54-0x0000000010DD0000-0x0000000010E1E000-memory.dmp
        Download

        memory/3276-56-0x0000000010DD0000-0x0000000010E1E000-memory.dmp
        Download

        memory/3276-55-0x0000000010DD0000-0x0000000010E1E000-memory.dmp
        Download