Overview

overview

10

Static

static

3

39a75b6107...c2.dll

windows10-2004-x64

10

39a75b6107...c2.dll

windows11-ltsc_2024-x64

10

Analysis

  • max time kernel
    150s
  • max time network
    151s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260911-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260911-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    17/10/2026, 00:50

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General

  • Target
    39a75b6107c51bba0076a547b9643a8b9df9448baab26eaed218f130e59c84c2.dll
  • Size 5.3MB
  • Sample261017-a67knazs6l
  • SHA256 39a75b6107c51bba0076a547b9643a8b9df9448baab26eaed218f130e59c84c2
  • MD5 SHA1 SHA512 SSDEEP TLSH
Score
10/10
backdoordiscoveryexecutionvalleyrat_s2persistenceransomwarespywarestealer

Malware Config

Extracted

Family

  • valleyrat_s2

C2

  • dtfva6.club:6803

  • dtfva6.club:6801

Signatures

  • Family: ValleyRat

    ValleyRat stage2 is a backdoor written in C++.

    backdoorvalleyrat_s2
  • Detects ValleyRAT payload 7 IoCs
  • Badlisted process makes network request 5 IoCs

    Network request originating from process or tool commonly abused by malware.

  • Executes dropped EXE 1 IoCs
  • Reads user/profile data of web browsers 3 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

    spywarestealer
  • Enumerates connected drives 3 TTPs 22 IoCs

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

  • Looks up external IP address via web service 1 TTPs 3 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

    discovery
  • Drops file in System32 directory 2 IoCs
  • Executes a command shell one-liner 1 TTPs 1 IoCs

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

    execution
  • Reads the TCP/IP host and domain name from the registry 1 TTPs 2 IoCs

    The configured hostname and DNS domain identify the machine and are commonly collected to profile a host before it reports in.

    discovery
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: LoadsDriver 47 IoCs
  • Suspicious use of AdjustPrivilegeToken 40 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:\Windows\system32\rundll32.exe
    rundll32.exe C:\Users\Admin\AppData\Local\Temp\39a75b6107c51bba0076a547b9643a8b9df9448baab26eaed218f130e59c84c2.dll,#1
    1⤵
    • Badlisted process makes network request
    • Enumerates connected drives
    • Drops file in System32 directory
    • Reads the TCP/IP host and domain name from the registry
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:3280
    • C:\Windows\System32\cmd.exe
      "C:\Windows\System32\cmd.exe" /c start "" "C:\Windows\System32\rundll32.exe" "C:\Windows\system32\CRCLIENT.dll",RESOURCES "C:\Windows\system32\rundll32.exe"
      2⤵
      • Executes a command shell one-liner
      • Suspicious use of WriteProcessMemory
      PID:1216
      • C:\Windows\System32\rundll32.exe
        "C:\Windows\System32\rundll32.exe" "C:\Windows\system32\CRCLIENT.dll",RESOURCES "C:\Windows\system32\rundll32.exe"
        3⤵
          PID:3360
    • C:\Windows\system32\rundll32.exe
      C:\Windows\system32\rundll32.exe
      1⤵
      • Executes dropped EXE
      PID:2160

    Network

          MITRE ATT&CK Enterprise v16

          Replay Monitor

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          Downloads

          46^[#^}(})})&^+{)&!'`]~},%'=`.484
          • Path C:\ProgramData\267$~@`]!=^(%&^[765\46^[#^}(})})&^+{)&!'`]~},%'=`.484
          • Size 16KB
          • SHA256 d82108e6578f4866d7114d6847282c04f0b146809bc66ded3300fe993b42d20f
          • MD5 SHA1 SHA512 SSDEEP TLSH
          Submit Download

          46^[#^}(})})&^+{)&!'`]~},%'=`.484.Logo
          • Path C:\ProgramData\267$~@`]!=^(%&^[765\46^[#^}(})})&^+{)&!'`]~},%'=`.484.Logo
          • Size 16KB
          • SHA256 3be70f5424c5cd2682e2db3b7ecc1cfa06def78bb7784827e861598e324052b7
          • MD5 SHA1 SHA512 SSDEEP TLSH
          Submit Download

          rundll32.exe
          • Path C:\Windows\System32\rundll32.exe
          • Size 88KB
          • SHA256 4b84dc6750937eb47b19cde0d23debd4d2f2211300171b36d13ef5ad11dd60f9
          • MD5 SHA1 SHA512 SSDEEP TLSH
          Submit Download

          memory/3280-15-0x000001B28DCF0000-0x000001B28DD59000-memory.dmp
          Download

          memory/3280-16-0x000001B28DEA0000-0x000001B28DF10000-memory.dmp
          Download

          memory/3280-20-0x000001B28DEA0000-0x000001B28DF10000-memory.dmp
          Download

          memory/3280-17-0x000001B28DEA0000-0x000001B28DF10000-memory.dmp
          Download

          memory/3280-24-0x000001B28DEA0000-0x000001B28DF10000-memory.dmp
          Download

          memory/3280-25-0x000001B28DEA0000-0x000001B28DF10000-memory.dmp
          Download

          memory/3280-47-0x000001B28DEA0000-0x000001B28DF10000-memory.dmp
          Download