Overview

overview

10

Static

static

5

Tax-Number715863.exe

windows10-2004-x64

10

Tax-Number715863.exe

windows11-ltsc_2024-x64

10

jli.dll

windows10-2004-x64

1

jli.dll

windows11-ltsc_2024-x64

8

msvcp140.dll

windows10-2004-x64

1

msvcp140.dll

windows11-ltsc_2024-x64

1

ucrtbase.dll

windows10-2004-x64

1

vcruntime140.dll

windows10-2004-x64

1

vcruntime140.dll

windows11-ltsc_2024-x64

1

vcruntime140_1.dll

windows10-2004-x64

1

vcruntime140_1.dll

windows11-ltsc_2024-x64

1

Analysis

  • max time kernel
    300s
  • max time network
    163s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260706-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260706-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    08/07/2026, 03:40

Sharing

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General

  • Target
    Tax-Number715863.exe
  • Size 24KB
  • Sample260708-d8cpvaaz8m
  • SHA256 295fc291d10a5c7319be945c93b2c1d2761e0ab0701f22457a9e1d860e1893c0
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
adwarebackdoorvalleyrat_s2persistenceransomwarespyware

Malware Config

Extracted

Family

  • valleyrat_s2

Version

  • 1.0

C2

  • yk.ggdy.com:8003

  • yk.ggdy.com:80

Attributes
  • campaign_date

    2023. 6.30

Signatures

  • Family: ValleyRat

    ValleyRat stage2 is a backdoor written in C++.

    backdoorvalleyrat_s2
  • Adds Run key to start application 2 TTPs 1 IoCs
    persistence
  • Boot or Logon Autostart Execution: Active Setup 2 TTPs 1 IoCs

    Adversaries may achieve persistence by adding a Registry key to the Active Setup of the local machine.

    persistence
  • Enumerates connected drives 3 TTPs 2 IoCs

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

  • Suspicious use of SetThreadContext 1 IoCs
  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 2 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Checks SCSI registry key(s) 3 TTPs 62 IoCs

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

  • Modifies Internet Explorer settings 1 TTPs 1 IoCs
    adwarespyware
  • Modifies registry class 38 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious behavior: LoadsDriver 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 42 IoCs
  • Suspicious use of FindShellTrayWindow 53 IoCs
  • Suspicious use of SendNotifyMessage 39 IoCs
  • Suspicious use of SetWindowsHookEx 3 IoCs
  • Suspicious use of WriteProcessMemory 9 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:\Users\Admin\AppData\Local\Temp\Tax-Number715863.exe
    "C:\Users\Admin\AppData\Local\Temp\Tax-Number715863.exe"
    1⤵
    • Adds Run key to start application
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:4684
    • C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe"
      2⤵
        PID:4584
    • C:\Windows\Temp\DCRCVDrv.sys
      C:\Windows\Temp\DCRCVDrv.sys
      1⤵
      • Executes dropped EXE
      PID:1548
    • C:\Windows\system32\cmd.exe
      "cmd /c start "" /D "C:\ProgramData\USB3YTFSE" Tax-Number715863.exe"
      1⤵
      • Suspicious use of WriteProcessMemory
      PID:3184
      • C:\ProgramData\USB3YTFSE\Tax-Number715863.exe
        "C:\ProgramData\USB3YTFSE\Tax-Number715863.exe"
        2⤵
        • Executes dropped EXE
        • Loads dropped DLL
        PID:936
        • C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe
          "C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe"
          3⤵
            PID:2832
      • C:\Windows\system32\sihost.exe
        sihost.exe
        1⤵
        • Suspicious use of FindShellTrayWindow
        • Suspicious use of WriteProcessMemory
        PID:236
        • C:\Windows\explorer.exe
          explorer.exe /LOADSAVEDWINDOWS
          2⤵
          • Boot or Logon Autostart Execution: Active Setup
          • Enumerates connected drives
          • Checks SCSI registry key(s)
          • Modifies Internet Explorer settings
          • Modifies registry class
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of FindShellTrayWindow
          • Suspicious use of SendNotifyMessage
          • Suspicious use of SetWindowsHookEx
          PID:3116
      • C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\SearchHost.exe
        "C:\Windows\SystemApps\MicrosoftWindows.Client.CBS_cw5n1h2txyewy\SearchHost.exe" -ServerName:CortanaUI.AppXstmwaab17q5s3y22tp6apqz7a45vwv65.mca
        1⤵
        • Modifies registry class
        • Suspicious use of SetWindowsHookEx
        PID:5548
      • C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe
        "C:\Windows\SystemApps\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\StartMenuExperienceHost.exe" -ServerName:App.AppXywbrabmsek0gm3tkwpr5kwzbs55tkqay.mca
        1⤵
        • Modifies registry class
        • Suspicious use of SetWindowsHookEx
        PID:5616
      • C:\Windows\system32\svchost.exe
        C:\Windows\system32\svchost.exe -k GPSvcGroup
        1⤵
          PID:3872

        Network

              MITRE ATT&CK Enterprise v16

              Replay Monitor

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              Downloads

              Tax-Number715863.exe
              • Path C:\ProgramData\USB3YTFSE\Tax-Number715863.exe
              • Size 24KB
              • SHA256 295fc291d10a5c7319be945c93b2c1d2761e0ab0701f22457a9e1d860e1893c0
              • MD5 SHA1 SHA512 SSDEEP TLSH
              Submit Download

              VCRUNTIME140.dll
              • Path C:\ProgramData\USB3YTFSE\VCRUNTIME140.dll
              • Size 120KB
              • SHA256 184146852727a9db4eea06178716bec3cdbb1015c911f6b0f915b184ad7775b2
              • MD5 SHA1 SHA512 SSDEEP TLSH
              Submit Download

              msvcp140.dll
              • Path C:\ProgramData\USB3YTFSE\msvcp140.dll
              • Size 540KB
              • SHA256 def46aa6a8f72f27bafac0c43334419486a4d1dcdb6c479a8ef7034b3e1fa4cb
              • MD5 SHA1 SHA512 SSDEEP TLSH
              Submit Download

              ucrtbase.dll
              • Path C:\ProgramData\USB3YTFSE\ucrtbase.dll
              • Size 1.3MB
              • SHA256 c2ed69b4a1bb9432c75134e813c70539e27c8c1fe96a784d9be78c874e93d9d5
              • MD5 SHA1 SHA512 SSDEEP TLSH
              Submit Download

              vcruntime140_1.dll
              • Path C:\ProgramData\USB3YTFSE\vcruntime140_1.dll
              • Size 46KB
              • SHA256 e6bfb3662ab4b1969a73441dbe35c96d51441b6bff8cf1fe7430bd5b246ca605
              • MD5 SHA1 SHA512 SSDEEP TLSH
              Submit Download

              prep_Activatable Class_Hermes_perf.cache
              • Path C:\Users\Admin\AppData\Local\Packages\Microsoft.Windows.StartMenuExperienceHost_cw5n1h2txyewy\TempState\prep_Activatable Class_Hermes_perf.cache
              • Size 599B
              • SHA256 b536a3dae9ea5c69081f0491eed829e3b57e32401fdf49a63031bcd6b20e6fdb
              • MD5 SHA1 SHA512 TLSH
              Submit Download

              DCRCVDrv.sys
              • Path C:\Windows\Temp\DCRCVDrv.sys
              • Size 137KB
              • SHA256 87e8d39db624f37d3e77aedf487a2dfd197f71a4730ea74f4e7a4341deaec2ff
              • MD5 SHA1 SHA512 SSDEEP TLSH
              Submit Download

              memory/1548-2-0x0000000000010000-0x000000000003D000-memory.dmp
              Download

              memory/4584-9-0x0000000000400000-0x0000000000450000-memory.dmp
              Download

              memory/5548-22-0x00000208001E0000-0x00000208002E0000-memory.dmp
              Download

              memory/5548-34-0x0000020803D90000-0x0000020803E90000-memory.dmp
              Download

              memory/5548-68-0x0000020804310000-0x0000020804330000-memory.dmp
              Download

              memory/5548-24-0x00000208001E0000-0x00000208002E0000-memory.dmp
              Download

              memory/5548-54-0x0000020803D10000-0x0000020803D30000-memory.dmp
              Download

              memory/5548-33-0x0000020803930000-0x0000020803950000-memory.dmp
              Download

              memory/5616-211-0x0000021A54340000-0x0000021A54774000-memory.dmp
              Download