Analysis

  • max time kernel
    150s
  • 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
    13/08/2026, 09:45

General

  • Target
    7A0F3EEBFB821131F22FF6EC2645B4FC.exe
  • Size 198KB
  • Sample260813-lrfdeaaa54
  • SHA256 b9f992a46caa3b898a960ceb13b8be215054e74d80b288de82b662c028faecb6
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Extracted

Family
  • valleyrat_s2

Version
  • 1.0

C2
  • 8.210.155.34:6868

Attributes
  • campaign_date

    2026. 8. 5

Signatures

  • Family: ValleyRat

    ValleyRat stage2 is a backdoor written in C++.

  • Detects ValleyRAT payload 18 IoCs
  • Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

    Using powershell.exe command.

  • Downloads MZ/PE file 2 IoCs
  • Executes dropped EXE 2 IoCs
  • Loads dropped DLL 4 IoCs
  • Adds Run key to start application 2 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.

  • Discovers running processes 1 TTPs 2 IoCs

    Running process information can be used to identify security tools or plan follow-on actions.

  • Executes a command shell one-liner 1 TTPs 4 IoCs

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

  • System Location Discovery: System Language Discovery 1 TTPs 16 IoCs

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

  • Delays execution with timeout.exe 2 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 14 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\7A0F3EEBFB821131F22FF6EC2645B4FC.exe
    "C:\Users\Admin\AppData\Local\Temp\7A0F3EEBFB821131F22FF6EC2645B4FC.exe"
    1⤵
    • Downloads MZ/PE file
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:812
    • C:\ProgramData\NGT955888\ZhiMaSkin.exe
      C:\ProgramData\NGT955888\ZhiMaSkin.exe
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Adds Run key to start application
      • Enumerates connected drives
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:4776
      • C:\Windows\SysWOW64\cmd.exe
        cmd.exe /c "C:\Users\Admin\AppData\Local\Temp\\svchost_tmp.bat"
        3⤵
        • Executes a command shell one-liner
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:4392
        • C:\Windows\SysWOW64\tasklist.exe
          tasklist /FI "IMAGENAME eq ZhiMaSkin.exe"
          4⤵
          • Discovers running processes
          • System Location Discovery: System Language Discovery
          PID:5104
        • C:\Windows\SysWOW64\find.exe
          find /I "ZhiMaSkin.exe"
          4⤵
          • System Location Discovery: System Language Discovery
          PID:1196
        • C:\Windows\SysWOW64\timeout.exe
          timeout /t 30 /nobreak
          4⤵
          • System Location Discovery: System Language Discovery
          • Delays execution with timeout.exe
          PID:4108
        • C:\Windows\SysWOW64\tasklist.exe
          tasklist /FI "IMAGENAME eq ZhiMaSkin.exe"
          4⤵
          • Discovers running processes
          • System Location Discovery: System Language Discovery
          PID:5048
        • C:\Windows\SysWOW64\find.exe
          find /I "ZhiMaSkin.exe"
          4⤵
          • System Location Discovery: System Language Discovery
          PID:2000
        • C:\Windows\SysWOW64\timeout.exe
          timeout /t 30 /nobreak
          4⤵
          • System Location Discovery: System Language Discovery
          • Delays execution with timeout.exe
          PID:4308
      • C:\Windows\SysWOW64\cmd.exe
        cmd.exe /C schtasks /query /tn "MicrosoftWindowsUpdate" > "C:\Users\Admin\AppData\Local\Temp\\~tmp_out_4776.txt" 2>nul
        3⤵
        • Executes a command shell one-liner
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:4800
        • C:\Windows\SysWOW64\schtasks.exe
          schtasks /query /tn "MicrosoftWindowsUpdate"
          4⤵
          • System Location Discovery: System Language Discovery
          PID:464
      • C:\Windows\SysWOW64\cmd.exe
        cmd.exe /C powershell -Command Set-ExecutionPolicy Unrestricted -Scope CurrentUser -Force
        3⤵
        • Executes a command shell one-liner
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:1804
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          powershell -Command Set-ExecutionPolicy Unrestricted -Scope CurrentUser -Force
          4⤵
          • Command and Scripting Interpreter: PowerShell
          • System Location Discovery: System Language Discovery
          • Suspicious use of AdjustPrivilegeToken
          PID:1152
      • C:\Windows\SysWOW64\cmd.exe
        cmd.exe /C powershell -ExecutionPolicy Bypass -WindowStyle Hidden -File "C:\Users\Admin\AppData\Local\j5uf1kog.ps1" > "C:\Users\Admin\AppData\Local\j5uf1kog.tmp" 2>nul
        3⤵
        • Executes a command shell one-liner
        • System Location Discovery: System Language Discovery
        • Suspicious use of WriteProcessMemory
        PID:4828
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          powershell -ExecutionPolicy Bypass -WindowStyle Hidden -File "C:\Users\Admin\AppData\Local\j5uf1kog.ps1"
          4⤵
          • Command and Scripting Interpreter: PowerShell
          • System Location Discovery: System Language Discovery
          • Suspicious use of AdjustPrivilegeToken
          PID:3064
  • C:\ProgramData\NGT955888\ZhiMaSkin.exe
    C:\ProgramData\NGT955888\ZhiMaSkin.exe
    1⤵
    • Executes dropped EXE
    • Loads dropped DLL
    • System Location Discovery: System Language Discovery
    PID:3880

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

        Loading Replay Monitor...

        Downloads

        ZhiMaSkin.exe

        • Path C:\ProgramData\NGT955888\ZhiMaSkin.exe
        • Size 4.3MB
        • SHA256 9556b7d5bb6e1db6ea73e2d20ef2c1edb46a645a5324570b717941aa2d0e40cd
        • MD5 SHA1 SHA512 SSDEEP TLSH

        ZhiMaUpdate.dll

        • Path C:\ProgramData\NGT955888\ZhiMaUpdate.dll
        • Size 110KB
        • SHA256 2d566f10587833b70b7b042e1fedd3d0b04116a17eafcb6e36c78185d1f1b919
        • MD5 SHA1 SHA512 SSDEEP TLSH

        libcurl.dll

        • Path C:\ProgramData\NGT955888\libcurl.dll
        • Size 978KB
        • SHA256 6bcde8c9d5c7198816b4dcfe39427e421d50a1e7dedb000901fced1cf6a66a6f
        • MD5 SHA1 SHA512 SSDEEP TLSH

        powershell.exe.log

        • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\powershell.exe.log
        • Size 2KB
        • SHA256 80d19c23e407ccffe9f5b43087c752b2157294a1e42d887705b9924ceb9e6af9
        • MD5 SHA1 SHA512 TLSH

        StartupProfileData-NonInteractive

        • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
        • Size 16KB
        • SHA256 3e2b5f610a192672e62f3358966d097914cd0c77ae8379031f6943241077379d
        • MD5 SHA1 SHA512 SSDEEP TLSH

        __PSScriptPolicyTest_yxfh4bok.deu.ps1

        • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_yxfh4bok.deu.ps1
        • Size 60B
        • SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
        • MD5 SHA1 SHA512 TLSH

        svchost_tmp.bat

        • Path C:\Users\Admin\AppData\Local\Temp\svchost_tmp.bat
        • Size 614B
        • SHA256 88b40fb80183d4ba737daa441ddb09b53c980a5976bc8d2fc104ff64507cc160
        • MD5 SHA1 SHA512 TLSH

        j5uf1kog.ps1

        • Path C:\Users\Admin\AppData\Local\j5uf1kog.ps1
        • Size 521B
        • SHA256 a17d529dca2825e362c9ce87b92376bcd6a0822134480867c7146973da0e2f01
        • MD5 SHA1 SHA512 TLSH

        j5uf1kog.tmp

        • Path C:\Users\Admin\AppData\Local\j5uf1kog.tmp
        • Size 9B
        • SHA256 421a244564c34296e185cdcf70d2269227ae102f2e7eeef94afddd495c4e06c2
        • MD5 SHA1 SHA512

        memory/812-13-0x0000000010000000-0x000000001001B000-memory.dmp

        memory/812-18-0x0000000010000000-0x000000001001B000-memory.dmp

        memory/812-19-0x0000000010000000-0x000000001001B000-memory.dmp

        memory/812-20-0x0000000010000000-0x000000001001B000-memory.dmp

        memory/812-12-0x00000000007C0000-0x00000000007D8000-memory.dmp

        memory/812-21-0x0000000010000000-0x000000001001B000-memory.dmp

        memory/1152-141-0x00000000079F0000-0x0000000007A86000-memory.dmp

        memory/1152-126-0x0000000006480000-0x00000000064CC000-memory.dmp

        memory/1152-140-0x00000000077E0000-0x00000000077EA000-memory.dmp

        memory/1152-138-0x0000000007DB0000-0x000000000842A000-memory.dmp

        memory/1152-139-0x0000000007770000-0x000000000778A000-memory.dmp

        memory/1152-137-0x0000000007450000-0x00000000074F3000-memory.dmp

        memory/1152-136-0x0000000006A30000-0x0000000006A4E000-memory.dmp

        memory/1152-127-0x00000000069F0000-0x0000000006A22000-memory.dmp

        memory/1152-128-0x000000006F110000-0x000000006F15C000-memory.dmp

        memory/1152-115-0x0000000005D80000-0x0000000005DE6000-memory.dmp

        memory/1152-125-0x0000000006450000-0x000000000646E000-memory.dmp

        memory/1152-124-0x0000000005E60000-0x00000000061B4000-memory.dmp

        memory/1152-142-0x0000000007970000-0x0000000007981000-memory.dmp

        memory/1152-114-0x00000000054A0000-0x00000000054C2000-memory.dmp

        memory/1152-116-0x0000000005DF0000-0x0000000005E56000-memory.dmp

        memory/1152-112-0x0000000004E70000-0x0000000004EA6000-memory.dmp

        memory/1152-113-0x00000000055A0000-0x0000000005BC8000-memory.dmp

        memory/3064-155-0x000000006F110000-0x000000006F15C000-memory.dmp

        memory/4776-40-0x0000000003850000-0x0000000003896000-memory.dmp

        memory/4776-111-0x0000000003850000-0x0000000003896000-memory.dmp

        memory/4776-110-0x0000000003850000-0x0000000003896000-memory.dmp

        memory/4776-72-0x0000000003850000-0x0000000003896000-memory.dmp

        memory/4776-73-0x0000000005080000-0x00000000050C2000-memory.dmp

        memory/4776-96-0x0000000003850000-0x0000000003896000-memory.dmp

        memory/4776-56-0x0000000003850000-0x0000000003896000-memory.dmp

        memory/4776-67-0x0000000003850000-0x0000000003896000-memory.dmp

        memory/4776-68-0x0000000003850000-0x0000000003896000-memory.dmp

        memory/4776-57-0x0000000010000000-0x0000000010034000-memory.dmp

        memory/4776-55-0x0000000003850000-0x0000000003896000-memory.dmp

        memory/4776-54-0x0000000003850000-0x0000000003896000-memory.dmp

        memory/4776-53-0x0000000003850000-0x0000000003896000-memory.dmp

        memory/4776-42-0x0000000003850000-0x0000000003896000-memory.dmp

        memory/4776-43-0x0000000010000000-0x000000001001C000-memory.dmp

        memory/4776-41-0x0000000003850000-0x0000000003896000-memory.dmp

        memory/4776-39-0x0000000003850000-0x0000000003896000-memory.dmp

        memory/4776-37-0x0000000003850000-0x0000000003896000-memory.dmp

        memory/4776-38-0x0000000003850000-0x0000000003896000-memory.dmp

        memory/4776-36-0x0000000003810000-0x000000000384F000-memory.dmp

        memory/4776-167-0x0000000003850000-0x0000000003896000-memory.dmp