Overview

overview

10

Static

static

5

Install_s9ri.exe

windows10-2004-x64

10

Install_s9ri.exe

windows11-ltsc_2024-x64

10

Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260513-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    27/07/2026, 15:21

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General

  • Target
    Install_s9ri.exe
  • Size 347KB
  • Sample260727-src2lswthx
  • SHA256 e93bfa7cc056600ca5f72727fc6c35f74318c0fe41d989af432efb179a03dd3e
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
backdoordefense_evasionexecutionvalleyrat_s2persistenceransomware

Malware Config

Extracted

Family

  • valleyrat_s2

Version

  • 1.0

C2

  • 47.242.198.248:5252

  • 47.242.198.248:80

Attributes
  • campaign_date

    2026. 7.21

Signatures

  • Family: ValleyRat

    ValleyRat stage2 is a backdoor written in C++.

    backdoorvalleyrat_s2
  • Detects ValleyRAT payload 2 IoCs
  • Looks for VirtualBox Guest Additions in registry 2 TTPs 1 IoCs
    defense_evasion
  • Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

    Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

    execution
  • Drops file in Drivers directory 1 IoCs
  • Looks for VMWare Tools registry key 2 TTPs 1 IoCs
    defense_evasion
  • Deletes itself 1 IoCs
  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 1 IoCs
  • Enumerates connected drives 3 TTPs 22 IoCs

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

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: LoadsDriver 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 2 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\Install_s9ri.exe
    "C:\Users\Admin\AppData\Local\Temp\Install_s9ri.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:4492
    • C:\Users\Admin\AppData\Local\Temp\0000118C0E58605B.exe
      "C:\Users\Admin\AppData\Local\Temp\0000118C0E58605B.exe" --child "C:\Users\Admin\AppData\Local\Temp\Install_s9ri.exe"
      2⤵
      • Looks for VirtualBox Guest Additions in registry
      • Drops file in Drivers directory
      • Looks for VMWare Tools registry key
      • Deletes itself
      • Executes dropped EXE
      • Loads dropped DLL
      • Enumerates connected drives
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:1988
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        powershell.exe -WindowStyle Hidden -NonInteractive -Command "Add-MpPreference -ExclusionPath 'C:\Windows\System32\drivers' -ExclusionProcess 'services.exe'"
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious use of AdjustPrivilegeToken
        PID:1992
  • C:\Windows\System32\drivers\k32.sys
    C:\Windows\System32\drivers\k32.sys
    1⤵
    • Executes dropped EXE
    PID:2780

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        0000118C0E58605B.exe
        • Path C:\Users\Admin\AppData\Local\Temp\0000118C0E58605B.exe
        • Size 347KB
        • SHA256 e93bfa7cc056600ca5f72727fc6c35f74318c0fe41d989af432efb179a03dd3e
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        Plg8846.tmp
        • Path C:\Users\Admin\AppData\Local\Temp\Plg8846.tmp
        • Size 449KB
        • SHA256 e5832f3521fb4d56026bd59437c1d25c05cb98d998883e23d8bc280ba6ca2445
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        __PSScriptPolicyTest_lax5ieao.3wp.ps1
        • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_lax5ieao.3wp.ps1
        • Size 60B
        • SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
        • MD5 SHA1 SHA512 TLSH
        Submit Download

        k32.sys
        • Path C:\Windows\System32\drivers\k32.sys
        • Size 27KB
        • SHA256 b8de157d2ccc5208643470c97e319030581121c51e4d48876cc25b8fbd0adb5a
        • MD5 SHA1 SHA512 SSDEEP TLSH
        Submit Download

        memory/1988-6-0x000001CA6BE60000-0x000001CA6BEB6000-memory.dmp
        Download

        memory/1988-9-0x000001CA6BE60000-0x000001CA6BEB6000-memory.dmp
        Download

        memory/1988-10-0x000001CA6BE60000-0x000001CA6BEB6000-memory.dmp
        Download

        memory/1988-7-0x000001CA6BE60000-0x000001CA6BEB6000-memory.dmp
        Download

        memory/1988-5-0x000001CA6BE60000-0x000001CA6BEB6000-memory.dmp
        Download

        memory/1988-23-0x000001CA6BE60000-0x000001CA6BEB6000-memory.dmp
        Download

        memory/1988-4-0x000001CA6A560000-0x000001CA6A5AF000-memory.dmp
        Download

        memory/1992-14-0x000001ED53BE0000-0x000001ED53BF0000-memory.dmp
        Download

        memory/1992-20-0x000001ED53B90000-0x000001ED53BB2000-memory.dmp
        Download