Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260513-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    19/06/2026, 12:16

General

  • Target
    Tax-Number919863.exe
  • Size 24KB
  • Sample260619-pfty7sg19v
  • SHA256 233086e7d57e16523ac3463df306cfc497a9ba3c3e8268f62c8625ef56b2380e
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Extracted

Family
  • valleyrat_s2

Version
  • 1.0

C2
  • yk.ggdy.com:8003

  • yk.ggdy.com:80

  • 103.97.131.186:8888

  • 103.97.131.186:6666

  • 103.97.128.141:7777

Attributes
  • campaign_date

    2023. 6.30

Signatures

  • Family: ValleyRat

    ValleyRat stage2 is a backdoor written in C++.

  • Detects ValleyRAT payload 16 IoCs
  • Drops file in Drivers directory 3 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Enumerates connected drives 3 TTPs 64 IoCs

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

  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Suspicious use of SetThreadContext 4 IoCs
  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: LoadsDriver 4 IoCs
  • Suspicious use of SetWindowsHookEx 4 IoCs
  • Suspicious use of WriteProcessMemory 29 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Tax-Number919863.exe
    "C:\Users\Admin\AppData\Local\Temp\Tax-Number919863.exe"
    1⤵
    • Drops file in Drivers directory
    • Adds Run key to start application
    • Suspicious use of SetThreadContext
    • Suspicious use of WriteProcessMemory
    PID:3284
    • C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe"
      2⤵
      • Enumerates connected drives
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of SetWindowsHookEx
      PID:2288
    • C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe
      "C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe"
      2⤵
      • Enumerates connected drives
      • System Location Discovery: System Language Discovery
      • Suspicious use of SetWindowsHookEx
      PID:4480
  • C:\Windows\System32\drivers\pcdhost.sys
    C:\Windows\System32\drivers\pcdhost.sys
    1⤵
    • Executes dropped EXE
    PID:1828
  • C:\Windows\system32\cmd.exe
    "cmd /c start "" /D "C:\ProgramData\USB3YTHS" Tax-Number919863.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4300
    • C:\ProgramData\USB3YTHS\Tax-Number919863.exe
      "C:\ProgramData\USB3YTHS\Tax-Number919863.exe"
      2⤵
      • Drops file in Drivers directory
      • Suspicious use of SetThreadContext
      • Executes dropped EXE
      • Loads dropped DLL
      • Suspicious use of WriteProcessMemory
      PID:736
      • C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe
        "C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe"
        3⤵
        • Enumerates connected drives
        • System Location Discovery: System Language Discovery
        • Suspicious use of SetWindowsHookEx
        PID:2280
      • C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe
        "C:\Windows\Microsoft.NET\Framework\v4.0.30319\ngen.exe"
        3⤵
        • Enumerates connected drives
        • System Location Discovery: System Language Discovery
        • Suspicious use of SetWindowsHookEx
        PID:4764

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        Tax-Number919863.exe

        • Path C:\ProgramData\USB3YTHS\Tax-Number919863.exe
        • Size 24KB
        • SHA256 233086e7d57e16523ac3463df306cfc497a9ba3c3e8268f62c8625ef56b2380e
        • MD5 SHA1 SHA512 SSDEEP TLSH

        20260619131922.jpg

        • Path C:\ProgramData\quickScreenShot\20260619\20260619131922.jpg
        • Size 106KB
        • SHA256 ff602482f1a5dfa768f5e61550b3b7bfcaea4287ebfee299f0abcf2dcb429bed
        • MD5 SHA1 SHA512 SSDEEP TLSH

        20260619132024.jpg

        • Path C:\ProgramData\quickScreenShot\20260619\20260619132024.jpg
        • Size 106KB
        • SHA256 8abc634f1b70fc005808cbd2636182c9fac23e0fb09631deca16eac18476a9cf
        • MD5 SHA1 SHA512 SSDEEP TLSH

        pcdhost.sys

        • Path C:\Windows\System32\drivers\pcdhost.sys
        • Size 17KB
        • SHA256 07c5209bf83065fe760f4fee4ed2308b0c523671f68ca73a3854c2c8c28c0541
        • MD5 SHA1 SHA512 SSDEEP TLSH

        memory/1828-2-0x0000000000010000-0x0000000000017000-memory.dmp

        memory/2280-28-0x0000000000750000-0x00000000007A0000-memory.dmp

        memory/2280-31-0x0000000000750000-0x00000000007A0000-memory.dmp

        memory/2280-53-0x0000000000750000-0x00000000007A0000-memory.dmp

        memory/2280-54-0x0000000000750000-0x00000000007A0000-memory.dmp

        memory/2280-55-0x0000000002D70000-0x0000000002DA9000-memory.dmp

        memory/2280-57-0x0000000002D70000-0x0000000002DA9000-memory.dmp

        memory/2280-76-0x0000000002D70000-0x0000000002DA9000-memory.dmp

        memory/2280-75-0x0000000002D70000-0x0000000002DA9000-memory.dmp

        memory/2280-66-0x0000000000750000-0x00000000007A0000-memory.dmp

        memory/2280-67-0x0000000000750000-0x00000000007A0000-memory.dmp

        memory/2280-29-0x0000000000750000-0x00000000007A0000-memory.dmp

        memory/2280-52-0x0000000000750000-0x00000000007A0000-memory.dmp

        memory/2280-30-0x0000000000750000-0x00000000007A0000-memory.dmp

        memory/2288-71-0x0000000003020000-0x0000000003059000-memory.dmp

        memory/2288-44-0x0000000000570000-0x00000000005C0000-memory.dmp

        memory/2288-8-0x0000000000570000-0x00000000005C0000-memory.dmp

        memory/2288-59-0x0000000000570000-0x00000000005C0000-memory.dmp

        memory/2288-41-0x0000000000570000-0x00000000005C0000-memory.dmp

        memory/2288-58-0x0000000000570000-0x00000000005C0000-memory.dmp

        memory/2288-43-0x0000000000570000-0x00000000005C0000-memory.dmp

        memory/2288-72-0x0000000003020000-0x0000000003059000-memory.dmp

        memory/2288-45-0x0000000000570000-0x00000000005C0000-memory.dmp

        memory/2288-46-0x0000000003020000-0x0000000003059000-memory.dmp

        memory/2288-6-0x0000000000570000-0x00000000005C0000-memory.dmp

        memory/2288-7-0x0000000000570000-0x00000000005C0000-memory.dmp

        memory/2288-5-0x0000000000570000-0x00000000005C0000-memory.dmp

        memory/2288-9-0x0000000000570000-0x00000000005C0000-memory.dmp

        memory/2288-51-0x0000000003020000-0x0000000003059000-memory.dmp

        memory/2288-10-0x0000000000570000-0x00000000005C0000-memory.dmp

        memory/4480-49-0x0000000000400000-0x0000000000450000-memory.dmp

        memory/4480-50-0x00000000037B0000-0x00000000037E9000-memory.dmp

        memory/4480-47-0x0000000000400000-0x0000000000450000-memory.dmp

        memory/4480-56-0x00000000037B0000-0x00000000037E9000-memory.dmp

        memory/4480-48-0x0000000000400000-0x0000000000450000-memory.dmp

        memory/4480-42-0x0000000000400000-0x0000000000450000-memory.dmp

        memory/4480-20-0x0000000000400000-0x0000000000450000-memory.dmp

        memory/4480-25-0x0000000000400000-0x0000000000450000-memory.dmp

        memory/4480-21-0x0000000000400000-0x0000000000450000-memory.dmp

        memory/4480-22-0x0000000000400000-0x0000000000450000-memory.dmp

        memory/4480-23-0x0000000000400000-0x0000000000450000-memory.dmp

        memory/4480-64-0x0000000000400000-0x0000000000450000-memory.dmp

        memory/4480-65-0x0000000000400000-0x0000000000450000-memory.dmp

        memory/4480-74-0x00000000037B0000-0x00000000037E9000-memory.dmp

        memory/4480-73-0x00000000037B0000-0x00000000037E9000-memory.dmp

        memory/4480-24-0x0000000000400000-0x0000000000450000-memory.dmp

        memory/4764-60-0x0000000000400000-0x0000000000450000-memory.dmp

        memory/4764-70-0x0000000000400000-0x0000000000450000-memory.dmp

        memory/4764-69-0x0000000000400000-0x0000000000450000-memory.dmp

        memory/4764-36-0x0000000000400000-0x0000000000450000-memory.dmp

        memory/4764-68-0x0000000004200000-0x0000000004239000-memory.dmp

        memory/4764-37-0x0000000000400000-0x0000000000450000-memory.dmp

        memory/4764-63-0x0000000004200000-0x0000000004239000-memory.dmp

        memory/4764-62-0x0000000000400000-0x0000000000450000-memory.dmp

        memory/4764-77-0x0000000004200000-0x0000000004239000-memory.dmp

        memory/4764-78-0x0000000004200000-0x0000000004239000-memory.dmp

        memory/4764-61-0x0000000000400000-0x0000000000450000-memory.dmp

        memory/4764-38-0x0000000000400000-0x0000000000450000-memory.dmp