Analysis

  • user interaction
    yes
  • max time kernel
    150s
  • max time network
    151s
  • platform
    windows11-ltsc_2024_x64
  • resource
    win11ltsc2024-20260709-en
  • resource tags

    arch:x64arch:x86image:win11ltsc2024-20260709-enlocale:en-usos:windows11-ltsc_2024-x64systemwindows
  • submitted
    22/07/2026, 11:13

General

  • Target
    EpsonScanDoc.489982.22.07.2026.exe
  • Size 25.3MB
  • Sample260722-nbpy1sgq2y
  • SHA256 199f8d87ccf76bdaa016d7d1c25461b03d7087fd72c6fb3511f3ea9ed402ee22
  • MD5 SHA1 SHA512 SSDEEP TLSH

Malware Config

Signatures

  • Family: RuRAT

    RuRAT is a remote admin tool sold as legitimate software but regularly abused in malicious phishing campaigns.

  • Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

    Run Powershell and hide display window.

  • Contacts a large (514) amount of remote hosts 1 TTPs

    This may indicate a network scan to discover remotely running services.

  • Drops startup file 2 IoCs
  • Executes dropped EXE 10 IoCs
  • Loads dropped DLL 11 IoCs
  • Badlisted process makes network request 2 IoCs

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

  • Enumerates connected drives 3 TTPs 23 IoCs

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

  • Drops file in System32 directory 10 IoCs
  • Executes a VBScript file via the Windows Script Host. 1 TTPs 1 IoCs
  • Drops file in Program Files directory 57 IoCs
  • Drops file in Windows directory 23 IoCs
  • Embeds OpenSSL 1 IoCs

    Embeds OpenSSL, may be used to circumvent TLS interception.

  • Enumerates physical storage devices 1 TTPs

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

  • Executes a command shell one-liner 1 TTPs 2 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 11 IoCs

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

  • System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 2 IoCs

    Adversaries may check for Internet connectivity on compromised systems.

  • Modifies data under HKEY_USERS 48 IoCs
  • Modifies registry class 24 IoCs
  • Runs ping.exe 1 TTPs 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 32 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 2 IoCs
  • Suspicious use of SendNotifyMessage 2 IoCs
  • Suspicious use of SetWindowsHookEx 43 IoCs
  • Suspicious use of WriteProcessMemory 15 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\EpsonScanDoc.489982.22.07.2026.exe
    "C:\Users\Admin\AppData\Local\Temp\EpsonScanDoc.489982.22.07.2026.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:3716
    • C:\Windows\system32\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\ProgramData\install.cmd" "
      2⤵
      • Drops startup file
      • Executes a command shell one-liner
      • Suspicious use of WriteProcessMemory
      PID:1732
      • C:\Windows\system32\wscript.exe
        wscript "C:\Users\Admin\AppData\Local\Temp\elev.vbs"
        3⤵
        • Executes a VBScript file via the Windows Script Host.
        • Suspicious use of WriteProcessMemory
        PID:3528
        • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -NoProfile -Command "try{Start-Process msiexec.exe -ArgumentList '/I','c:\ProgramData\KB5094126.msi','/qn' -Verb RunAs -WindowStyle Hidden -ErrorAction Stop -Wait}catch{exit 1}"
          4⤵
          • Command and Scripting Interpreter: PowerShell
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of WriteProcessMemory
          PID:1300
          • C:\Windows\system32\msiexec.exe
            "C:\Windows\system32\msiexec.exe" /I c:\ProgramData\KB5094126.msi /qn
            5⤵
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of SetWindowsHookEx
            PID:2916
        • C:\Windows\System32\cmd.exe
          "C:\Windows\System32\cmd.exe" /c ping -n 2 127.0.0.1 ^>nul ^& del "C:\Users\Admin\AppData\Local\Temp\elev.vbs"
          4⤵
          • Executes a command shell one-liner
          • System Network Configuration Discovery: Internet Connection Discovery
          • Suspicious use of WriteProcessMemory
          PID:3776
          • C:\Windows\system32\PING.EXE
            ping -n 2 127.0.0.1 >nul & del "C:\Users\Admin\AppData\Local\Temp\elev.vbs"
            5⤵
            • System Network Configuration Discovery: Internet Connection Discovery
            • Runs ping.exe
            PID:5400
  • C:\Windows\system32\msiexec.exe
    C:\Windows\system32\msiexec.exe /V
    1⤵
    • Badlisted process makes network request
    • Enumerates connected drives
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • Modifies data under HKEY_USERS
    • Modifies registry class
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:5484
    • \??\c:\Windows\syswow64\MsiExec.exe
      c:\Windows\syswow64\MsiExec.exe -Embedding BE7B30D86AECBF06C7E97EF369B744FC
      2⤵
      • Loads dropped DLL
      • System Location Discovery: System Language Discovery
      • Suspicious use of SetWindowsHookEx
      PID:4824
    • \??\c:\Program Files (x86)\Remote Utilities - Host\rfusclient.exe
      "c:\Program Files (x86)\Remote Utilities - Host\rfusclient.exe" -msi_copy "c:\ProgramData\KB5094126.msi"
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of SetWindowsHookEx
      PID:4948
    • \??\c:\Program Files (x86)\Remote Utilities - Host\rutserv.exe
      "c:\Program Files (x86)\Remote Utilities - Host\rutserv.exe" /silentinstall
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of SetWindowsHookEx
      PID:3848
    • \??\c:\Program Files (x86)\Remote Utilities - Host\rutserv.exe
      "c:\Program Files (x86)\Remote Utilities - Host\rutserv.exe" -firewall
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of SetWindowsHookEx
      PID:6068
    • \??\c:\Program Files (x86)\Remote Utilities - Host\rutserv.exe
      "c:\Program Files (x86)\Remote Utilities - Host\rutserv.exe" /start
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of SetWindowsHookEx
      PID:5056
  • \??\c:\Program Files (x86)\Remote Utilities - Host\rutserv.exe
    "c:\Program Files (x86)\Remote Utilities - Host\rutserv.exe" -service
    1⤵
    • Executes dropped EXE
    • Loads dropped DLL
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of SetWindowsHookEx
    PID:240
  • \??\c:\Program Files (x86)\Remote Utilities - Host\rutserv.exe
    "c:\Program Files (x86)\Remote Utilities - Host\rutserv.exe" -service
    1⤵
    • Executes dropped EXE
    • Loads dropped DLL
    • Drops file in System32 directory
    • System Location Discovery: System Language Discovery
    • Modifies data under HKEY_USERS
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:4200
    • \??\c:\Program Files (x86)\Remote Utilities - Host\rfusclient.exe
      "c:\Program Files (x86)\Remote Utilities - Host\rfusclient.exe"
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:3924
      • \??\c:\Program Files (x86)\Remote Utilities - Host\rfusclient.exe
        "c:\Program Files (x86)\Remote Utilities - Host\rfusclient.exe" /tray
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • System Location Discovery: System Language Discovery
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of SetWindowsHookEx
        PID:5964
    • \??\c:\Program Files (x86)\Remote Utilities - Host\rfusclient.exe
      "c:\Program Files (x86)\Remote Utilities - Host\rfusclient.exe" /tray
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of FindShellTrayWindow
      • Suspicious use of SendNotifyMessage
      • Suspicious use of SetWindowsHookEx
      PID:2128
    • \??\c:\Program Files (x86)\Remote Utilities - Host\rutserv.exe
      "c:\Program Files (x86)\Remote Utilities - Host\rutserv.exe" -firewall
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • System Location Discovery: System Language Discovery
      • Modifies data under HKEY_USERS
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of SetWindowsHookEx
      PID:7072
  • C:\Windows\System32\rundll32.exe
    C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
    1⤵
      PID:2596

    Network

          MITRE ATT&CK Enterprise v16

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          e59e99e.rbs

          • Path C:\Config.Msi\e59e99e.rbs
          • Size 470KB
          • SHA256 47eb334ae8dd3ed7cc349197f98d4128d206269ec195e73c2b224f4aafa7368e
          • MD5 SHA1 SHA512 SSDEEP TLSH

          rfusclient.exe

          • Path C:\Program Files (x86)\Remote Utilities - Host\rfusclient.exe
          • Size 17.0MB
          • SHA256 e4b203c315f44799e4945c3b95501b9bf5480bda5ff596dadbfebdb39996020a
          • MD5 SHA1 SHA512 SSDEEP TLSH

          rutserv.exe

          • Path C:\Program Files (x86)\Remote Utilities - Host\rutserv.exe
          • Size 21.7MB
          • SHA256 6fc8237bbb1cb778bf7735fd92963cd1f95acd44e7c987c40e9349ed5be85327
          • MD5 SHA1 SHA512 SSDEEP TLSH

          install.cmd

          • Path C:\ProgramData\install.cmd
          • Size 1KB
          • SHA256 406a20b04179b482a88b5901735256ea7966d8ae3f3658cfbf29269d2a2902fa
          • MD5 SHA1 SHA512 TLSH

          elev.vbs

          • Path C:\Users\Admin\AppData\Local\Temp\elev.vbs
          • Size 706B
          • SHA256 e566943f71f8093f09e24a1fdc688b5d4ed8e1d2e4e98d4471271e06775f7001
          • MD5 SHA1 SHA512 TLSH

          MSI2A6D.tmp

          • Path C:\Windows\Installer\MSI2A6D.tmp
          • Size 165KB
          • SHA256 1f6f0d9f136bc170cfbc48a1015113947087ac27aed1e3e91673ffc91b9f390b
          • MD5 SHA1 SHA512 SSDEEP TLSH

          EULA.rtf

          • Path \??\c:\Program Files (x86)\Remote Utilities - Host\EULA.rtf
          • Size 63KB
          • SHA256 ff89e44b7e6b7c8c9a84c67e40bde6491f851b0e6e4143ac8f665538eec11e87
          • MD5 SHA1 SHA512 SSDEEP TLSH

          Privacy_policy.rtf

          • Path \??\c:\Program Files (x86)\Remote Utilities - Host\Privacy_policy.rtf
          • Size 139KB
          • SHA256 1fcb0c18d74b4157752a5776ca47bf31f893453b4bcb82ba67b402769d054c26
          • MD5 SHA1 SHA512 SSDEEP TLSH

          eventmsg.dll

          • Path \??\c:\Program Files (x86)\Remote Utilities - Host\eventmsg.dll
          • Size 57KB
          • SHA256 badd947460e6ac9ef7d9abc286054b5b73e17ab5694f827f26d56203974f1ea2
          • MD5 SHA1 SHA512 SSDEEP TLSH

          libasset32.dll

          • Path \??\c:\Program Files (x86)\Remote Utilities - Host\libasset32.dll
          • Size 9.4MB
          • SHA256 299b3f5e49d3303e0a4793fee52a1165c340a560729115f1a4d421d6f0416fa5
          • MD5 SHA1 SHA512 SSDEEP TLSH

          libcodec32.dll

          • Path \??\c:\Program Files (x86)\Remote Utilities - Host\libcodec32.dll
          • Size 5.9MB
          • SHA256 a4a53244ea6bafa55c6f1c4b13da9a6a77e758842593e51b01b34dc137465930
          • MD5 SHA1 SHA512 SSDEEP TLSH

          licenses.txt

          • Path \??\c:\Program Files (x86)\Remote Utilities - Host\licenses.txt
          • Size 19KB
          • SHA256 4ef24da2e7933364af0c7918207927283d0b7664c615b888cc80843d7a62faa4
          • MD5 SHA1 SHA512 SSDEEP TLSH

          vp8decoder.dll

          • Path \??\c:\Program Files (x86)\Remote Utilities - Host\vp8decoder.dll
          • Size 384KB
          • SHA256 851093c801f9f2f3ba670ff2c14c0a673b17efd72731c28a49ca3dcb64b57718
          • MD5 SHA1 SHA512 SSDEEP TLSH

          vp8encoder.dll

          • Path \??\c:\Program Files (x86)\Remote Utilities - Host\vp8encoder.dll
          • Size 1.6MB
          • SHA256 1fad67e1677401751b4c1ef7d18167174f72c247d8656e99a91104901d1b1400
          • MD5 SHA1 SHA512 SSDEEP TLSH

          webmmux.dll

          • Path \??\c:\Program Files (x86)\Remote Utilities - Host\webmmux.dll
          • Size 264KB
          • SHA256 1a1b4441fc6fdaf8b9d4a5de3e5855e15217e3810f4aca21a5ca9bb70afab5b4
          • MD5 SHA1 SHA512 SSDEEP TLSH

          webmvorbisdecoder.dll

          • Path \??\c:\Program Files (x86)\Remote Utilities - Host\webmvorbisdecoder.dll
          • Size 369KB
          • SHA256 2d2a368c897f3aadeb4a8d0f46016f0148799fdc7b18059f1a6cce62883ae7de
          • MD5 SHA1 SHA512 SSDEEP TLSH

          webmvorbisencoder.dll

          • Path \??\c:\Program Files (x86)\Remote Utilities - Host\webmvorbisencoder.dll
          • Size 864KB
          • SHA256 f858c62cac8d5063a3cffb8a7beb241725b94ab326e0bd2442dacb8e70461721
          • MD5 SHA1 SHA512 SSDEEP TLSH

          KB5094126.msi

          • Path \??\c:\ProgramData\KB5094126.msi
          • Size 27.6MB
          • SHA256 2f232597fcae99d5be7968f31ba4738207df8e9005093c86405745e78d0ba2ba
          • MD5 SHA1 SHA512 SSDEEP TLSH

          memory/240-142-0x000000006D280000-0x000000006D9B6000-memory.dmp

          memory/240-141-0x0000000000490000-0x0000000001B10000-memory.dmp

          memory/1300-27-0x000002153E200000-0x000002153E222000-memory.dmp

          memory/2128-200-0x0000000000BC0000-0x0000000001D75000-memory.dmp

          memory/2128-183-0x0000000000BC0000-0x0000000001D75000-memory.dmp

          memory/2128-239-0x0000000000BC0000-0x0000000001D75000-memory.dmp

          memory/2128-232-0x0000000000BC0000-0x0000000001D75000-memory.dmp

          memory/2128-225-0x0000000000BC0000-0x0000000001D75000-memory.dmp

          memory/2128-216-0x0000000000BC0000-0x0000000001D75000-memory.dmp

          memory/2128-207-0x0000000000BC0000-0x0000000001D75000-memory.dmp

          memory/2128-193-0x0000000000BC0000-0x0000000001D75000-memory.dmp

          memory/2128-184-0x000000006D280000-0x000000006D9B6000-memory.dmp

          memory/3848-136-0x0000000000490000-0x0000000001B10000-memory.dmp

          memory/3848-137-0x000000006D280000-0x000000006D9B6000-memory.dmp

          memory/3924-182-0x000000006D280000-0x000000006D9B6000-memory.dmp

          memory/3924-181-0x0000000000BC0000-0x0000000001D75000-memory.dmp

          memory/4200-210-0x0000000000490000-0x0000000001B10000-memory.dmp

          memory/4200-221-0x0000000000490000-0x0000000001B10000-memory.dmp

          memory/4200-234-0x0000000000490000-0x0000000001B10000-memory.dmp

          memory/4200-189-0x0000000000490000-0x0000000001B10000-memory.dmp

          memory/4200-178-0x0000000000490000-0x0000000001B10000-memory.dmp

          memory/4200-196-0x0000000000490000-0x0000000001B10000-memory.dmp

          memory/4200-227-0x0000000000490000-0x0000000001B10000-memory.dmp

          memory/4200-203-0x0000000000490000-0x0000000001B10000-memory.dmp

          memory/4200-179-0x000000006D280000-0x000000006D9B6000-memory.dmp

          memory/4948-114-0x0000000000BC0000-0x0000000001D75000-memory.dmp

          memory/4948-115-0x000000006D280000-0x000000006D9B6000-memory.dmp

          memory/5056-174-0x000000006D280000-0x000000006D9B6000-memory.dmp

          memory/5056-173-0x0000000000490000-0x0000000001B10000-memory.dmp

          memory/5964-187-0x000000006D280000-0x000000006D9B6000-memory.dmp

          memory/5964-186-0x0000000000BC0000-0x0000000001D75000-memory.dmp

          memory/6068-145-0x000000006D280000-0x000000006D9B6000-memory.dmp

          memory/6068-144-0x0000000000490000-0x0000000001B10000-memory.dmp

          memory/7072-218-0x0000000000490000-0x0000000001B10000-memory.dmp

          memory/7072-219-0x000000006D280000-0x000000006D9B6000-memory.dmp