Analysis

  • max time kernel
    150s
  • max time network
    148s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260513-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    10/08/2026, 17:04

General

  • Target
    ab42f05f3ed9b27d2d84482d6720886a110a885ecc521e9bb67d0f72fe4b7ab1.exe
  • Size 3.8MB
  • Sample260810-vlnl9stdmb
  • SHA256 ab42f05f3ed9b27d2d84482d6720886a110a885ecc521e9bb67d0f72fe4b7ab1
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Extracted

Family
  • valleyrat_s2

Version
  • 1.0

C2
  • 154.12.19.70:22011

  • 154.12.19.70:22012

Signatures

  • Family: ValleyRat

    ValleyRat stage2 is a backdoor written in C++.

  • Detects ValleyRAT payload 6 IoCs
  • Modifies Windows Defender Real-time Protection settings 3 TTPs 32 IoCs
  • Modifies Windows Defender TamperProtection settings 3 TTPs 2 IoCs
  • Modifies Windows Defender notification settings 3 TTPs 6 IoCs
  • Modifies firewall policy service 3 TTPs 1 IoCs
  • UAC bypass 3 TTPs 3 IoCs
  • Windows security bypass 2 TTPs 4 IoCs
  • Server Software Component: Terminal Services DLL 1 TTPs 1 IoCs
  • Boot or Logon Autostart Execution: LSASS Driver 2 TTPs 2 IoCs

    Adversaries may modify or add LSASS drivers to obtain persistence on compromised systems.

  • Executes dropped EXE 3 IoCs
  • Loads dropped DLL 2 IoCs
  • Windows security modification 2 TTPs 8 IoCs
  • Checks whether UAC is enabled 1 TTPs 1 IoCs
  • Enumerates connected drives 3 TTPs 22 IoCs

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

  • Executes a command shell one-liner 1 TTPs 3 IoCs

    Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

  • Modifies data under HKEY_USERS 19 IoCs
  • Modifies registry class 12 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious behavior: LoadsDriver 3 IoCs
  • Suspicious use of FindShellTrayWindow 2 IoCs
  • Suspicious use of SendNotifyMessage 2 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 9 IoCs
  • System policy modification 1 TTPs 3 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.

  • Uses Volume Shadow Copy WMI provider

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

  • Uses Volume Shadow Copy service COM API

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\ab42f05f3ed9b27d2d84482d6720886a110a885ecc521e9bb67d0f72fe4b7ab1.exe
    "C:\Users\Admin\AppData\Local\Temp\ab42f05f3ed9b27d2d84482d6720886a110a885ecc521e9bb67d0f72fe4b7ab1.exe"
    1⤵
    • Modifies Windows Defender Real-time Protection settings
    • Modifies Windows Defender TamperProtection settings
    • Modifies Windows Defender notification settings
    • Modifies firewall policy service
    • UAC bypass
    • Windows security bypass
    • Server Software Component: Terminal Services DLL
    • Boot or Logon Autostart Execution: LSASS Driver
    • Loads dropped DLL
    • Windows security modification
    • Checks whether UAC is enabled
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of FindShellTrayWindow
    • Suspicious use of SendNotifyMessage
    • Suspicious use of WriteProcessMemory
    • System policy modification
    PID:4508
    • C:\Windows\SYSTEM32\cmd.exe
      cmd.exe /c "gpupdate /force"
      2⤵
      • Executes a command shell one-liner
      • Suspicious use of WriteProcessMemory
      PID:3812
      • C:\Windows\system32\gpupdate.exe
        gpupdate /force
        3⤵
          PID:3772
      • C:\Windows\SYSTEM32\cmd.exe
        cmd.exe /c "gpupdate /force"
        2⤵
        • Executes a command shell one-liner
        • Suspicious use of WriteProcessMemory
        PID:4300
        • C:\Windows\system32\gpupdate.exe
          gpupdate /force
          3⤵
            PID:2232
      • C:\Users\Admin\AppData\Local\Temp\~tmp_93408.tmp
        C:\Users\Admin\AppData\Local\Temp\~tmp_93408.tmp
        1⤵
        • Executes dropped EXE
        PID:2532
      • C:\Users\Admin\AppData\Local\Temp\~tmp_79775.tmp
        C:\Users\Admin\AppData\Local\Temp\~tmp_79775.tmp
        1⤵
        • Executes dropped EXE
        PID:1392
      • C:\Windows\system32\svchost.exe
        C:\Windows\system32\svchost.exe -k KillService -s KillService
        1⤵
        • Modifies Windows Defender Real-time Protection settings
        • Modifies Windows Defender TamperProtection settings
        • Modifies Windows Defender notification settings
        • Windows security bypass
        • Boot or Logon Autostart Execution: LSASS Driver
        • Loads dropped DLL
        • Modifies data under HKEY_USERS
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of WriteProcessMemory
        PID:552
        • C:\Windows\system32\conhost.exe
          "C:\Windows\system32\conhost.exe"
          2⤵
          • Enumerates connected drives
          • Suspicious behavior: GetForegroundWindowSpam
          • Suspicious use of SetWindowsHookEx
          • Suspicious use of WriteProcessMemory
          PID:3848
          • C:\Windows\system32\cmd.exe
            C:\Windows\system32\cmd.exe
            3⤵
              PID:3988
          • C:\Windows\system32\cmd.exe
            cmd.exe /c "gpupdate /force"
            2⤵
            • Executes a command shell one-liner
            • Suspicious use of WriteProcessMemory
            PID:4944
            • C:\Windows\system32\gpupdate.exe
              gpupdate /force
              3⤵
                PID:892
          • C:\Windows\TEMP\drv_BootRepair.sys
            C:\Windows\TEMP\drv_BootRepair.sys
            1⤵
            • Executes dropped EXE
            PID:4432

          Network

                MITRE ATT&CK Enterprise v16

                Replay Monitor

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                Downloads

                Svchost.dll

                • Path C:\ProgramData\OpenraVPN\Svchost.dll
                • Size 1007KB
                • SHA256 9307331912424541feccdc8b347f17d68d3478d6413905b382d3024fb3eddaf4
                • MD5 SHA1 SHA512 SSDEEP TLSH

                ~tmp_79775.tmp

                • Path C:\Users\Admin\AppData\Local\Temp\~tmp_79775.tmp
                • Size 29KB
                • SHA256 d25e2d524c5abf1de38bd286117f79d4c9a36a020efb3faa6de0ce42a5274eef
                • MD5 SHA1 SHA512 SSDEEP TLSH

                ~tmp_93408.tmp

                • Path C:\Users\Admin\AppData\Local\Temp\~tmp_93408.tmp
                • Size 265KB
                • SHA256 84e3cd38f23376851e5b1b083e869bf3fe50513d13c75e6a8c42b6447d6e1051
                • MD5 SHA1 SHA512 SSDEEP TLSH

                drv_BootRepair.sys

                • Path C:\Windows\Temp\drv_BootRepair.sys
                • Size 29KB
                • SHA256 5ab36c116767eaae53a466fbc2dae7cfd608ed77721f65e83312037fbd57c946
                • MD5 SHA1 SHA512 SSDEEP TLSH

                memory/3848-17-0x000001937BCB0000-0x000001937BCD9000-memory.dmp

                memory/3848-23-0x000001937BF60000-0x000001937BFAD000-memory.dmp

                memory/3848-15-0x000001937BCB0000-0x000001937BCD9000-memory.dmp

                memory/3848-16-0x000001937BCB0000-0x000001937BCD9000-memory.dmp

                memory/3848-13-0x0000019377AD0000-0x0000019377AD1000-memory.dmp

                memory/3848-18-0x000001937BF60000-0x000001937BFAD000-memory.dmp

                memory/3848-19-0x000001937BF60000-0x000001937BFAD000-memory.dmp

                memory/3848-14-0x000001937BCB0000-0x000001937BCD9000-memory.dmp

                memory/3848-22-0x000001937BF60000-0x000001937BFAD000-memory.dmp

                memory/3848-24-0x000001937BCB0000-0x000001937BCD9000-memory.dmp

                memory/3848-25-0x000001937BCB0000-0x000001937BCD9000-memory.dmp

                memory/3848-26-0x000001937BF60000-0x000001937BFAD000-memory.dmp

                memory/3848-27-0x0000000180000000-0x0000000180076000-memory.dmp

                memory/3848-42-0x000001937BF60000-0x000001937BFAD000-memory.dmp