Analysis

  • max time kernel
    149s
  • max time network
    142s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20260513-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20260513-enlocale:en-usos:windows10-2004-x64systemwindows
  • submitted
    22/07/2026, 09:17

General

  • Target
    Kopiia_elektronnoho_dokumenta.135240.22.07.2026.exe
  • Size 25.3MB
  • Sample260722-k87njsfr21
  • SHA256 f0d2fb5adec8c9ec713d9115fb4f13ba4175d5e51ae3c378dc8472e1565b1b2d
  • 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.

  • Contacts a large (520) amount of remote hosts 1 TTPs

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

  • Checks computer location settings 2 TTPs 5 IoCs

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

  • Executes dropped EXE 10 IoCs
  • Loads dropped DLL 11 IoCs
  • Badlisted process makes network request 8 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 12 IoCs
  • Drops file in Program Files directory 57 IoCs
  • Drops file in Windows directory 19 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).

  • 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.

  • Modifies data under HKEY_USERS 49 IoCs
  • Modifies registry class 25 IoCs
  • Modifies system certificate store 2 TTPs 8 IoCs
  • Suspicious behavior: EnumeratesProcesses 30 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of FindShellTrayWindow 2 IoCs
  • Suspicious use of SendNotifyMessage 2 IoCs
  • Suspicious use of SetWindowsHookEx 40 IoCs
  • Suspicious use of WriteProcessMemory 10 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Kopiia_elektronnoho_dokumenta.135240.22.07.2026.exe
    "C:\Users\Admin\AppData\Local\Temp\Kopiia_elektronnoho_dokumenta.135240.22.07.2026.exe"
    1⤵
    • Checks computer location settings
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:4744
    • C:\Windows\System32\msiexec.exe
      "C:\Windows\System32\msiexec.exe" /i "C:\Users\Admin\AppData\Local\Temp\21.msi" /qn
      2⤵
      • Suspicious use of AdjustPrivilegeToken
      PID:5852
  • 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 WriteProcessMemory
    PID:6096
    • C:\Windows\syswow64\MsiExec.exe
      C:\Windows\syswow64\MsiExec.exe -Embedding 5EBEEE328C6DED492627AAECF8B32AAA
      2⤵
      • Loads dropped DLL
      • System Location Discovery: System Language Discovery
      PID:1208
    • C:\Program Files (x86)\Remote Utilities - Host\rfusclient.exe
      "C:\Program Files (x86)\Remote Utilities - Host\rfusclient.exe" -msi_copy "C:\Users\Admin\AppData\Local\Temp\21.msi"
      2⤵
      • Checks computer location settings
      • Executes dropped EXE
      • Loads dropped DLL
      • System Location Discovery: System Language Discovery
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of SetWindowsHookEx
      PID:6040
    • 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:260
    • 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:4724
    • 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:3648
  • C:\Program Files (x86)\Remote Utilities - Host\rutserv.exe
    "C:\Program Files (x86)\Remote Utilities - Host\rutserv.exe" -service
    1⤵
    • Checks computer location settings
    • Executes dropped EXE
    • Loads dropped DLL
    • System Location Discovery: System Language Discovery
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of SetWindowsHookEx
    PID:5388
  • 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
    • Modifies system certificate store
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:3096
    • 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:1888
      • C:\Program Files (x86)\Remote Utilities - Host\rfusclient.exe
        "C:\Program Files (x86)\Remote Utilities - Host\rfusclient.exe" /tray
        3⤵
        • Checks computer location settings
        • Executes dropped EXE
        • Loads dropped DLL
        • System Location Discovery: System Language Discovery
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of SetWindowsHookEx
        PID:4680
    • C:\Program Files (x86)\Remote Utilities - Host\rfusclient.exe
      "C:\Program Files (x86)\Remote Utilities - Host\rfusclient.exe" /tray
      2⤵
      • Checks computer location settings
      • 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:4728
    • 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:3420

Network

        MITRE ATT&CK Enterprise v16

        Replay Monitor

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        Downloads

        e58464e.rbs

        • Path C:\Config.Msi\e58464e.rbs
        • Size 470KB
        • SHA256 5f9a895f52b83683ba5264f76b82c5593e4be096da68d690918339479acd127f
        • 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

        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

        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

        21.msi

        • Path C:\Users\Admin\AppData\Local\Temp\21.msi
        • Size 27.6MB
        • SHA256 70eada83d62a7aeb27c5952fe0a85cdba9c2e85b9cbeb0dd127e7b0d6bac5a7f
        • MD5 SHA1 SHA512 SSDEEP TLSH

        MSIC416.tmp

        • Path C:\Windows\Installer\MSIC416.tmp
        • Size 165KB
        • SHA256 1f6f0d9f136bc170cfbc48a1015113947087ac27aed1e3e91673ffc91b9f390b
        • MD5 SHA1 SHA512 SSDEEP TLSH

        memory/260-122-0x000000006D280000-0x000000006D9B6000-memory.dmp

        memory/260-121-0x0000000000B20000-0x00000000021A0000-memory.dmp

        memory/1888-167-0x0000000000AD0000-0x0000000001C85000-memory.dmp

        memory/1888-168-0x000000006D280000-0x000000006D9B6000-memory.dmp

        memory/3096-213-0x0000000000B20000-0x00000000021A0000-memory.dmp

        memory/3096-206-0x0000000000B20000-0x00000000021A0000-memory.dmp

        memory/3096-219-0x0000000000B20000-0x00000000021A0000-memory.dmp

        memory/3096-195-0x0000000000B20000-0x00000000021A0000-memory.dmp

        memory/3096-164-0x000000006D280000-0x000000006D9B6000-memory.dmp

        memory/3096-163-0x0000000000B20000-0x00000000021A0000-memory.dmp

        memory/3096-226-0x0000000000B20000-0x00000000021A0000-memory.dmp

        memory/3096-188-0x0000000000B20000-0x00000000021A0000-memory.dmp

        memory/3096-174-0x0000000000B20000-0x00000000021A0000-memory.dmp

        memory/3096-181-0x0000000000B20000-0x00000000021A0000-memory.dmp

        memory/3420-203-0x0000000000B20000-0x00000000021A0000-memory.dmp

        memory/3420-204-0x000000006D280000-0x000000006D9B6000-memory.dmp

        memory/3648-160-0x000000006D280000-0x000000006D9B6000-memory.dmp

        memory/3648-159-0x0000000000B20000-0x00000000021A0000-memory.dmp

        memory/4680-172-0x000000006D280000-0x000000006D9B6000-memory.dmp

        memory/4680-171-0x0000000000AD0000-0x0000000001C85000-memory.dmp

        memory/4724-130-0x000000006D280000-0x000000006D9B6000-memory.dmp

        memory/4724-129-0x0000000000B20000-0x00000000021A0000-memory.dmp

        memory/4728-201-0x0000000000AD0000-0x0000000001C85000-memory.dmp

        memory/4728-192-0x0000000000AD0000-0x0000000001C85000-memory.dmp

        memory/4728-170-0x000000006D280000-0x000000006D9B6000-memory.dmp

        memory/4728-185-0x0000000000AD0000-0x0000000001C85000-memory.dmp

        memory/4728-169-0x0000000000AD0000-0x0000000001C85000-memory.dmp

        memory/4728-178-0x0000000000AD0000-0x0000000001C85000-memory.dmp

        memory/4728-210-0x0000000000AD0000-0x0000000001C85000-memory.dmp

        memory/4728-217-0x0000000000AD0000-0x0000000001C85000-memory.dmp

        memory/4728-224-0x0000000000AD0000-0x0000000001C85000-memory.dmp

        memory/5388-127-0x0000000000B20000-0x00000000021A0000-memory.dmp

        memory/5388-128-0x000000006D280000-0x000000006D9B6000-memory.dmp

        memory/6040-99-0x0000000000AD0000-0x0000000001C85000-memory.dmp

        memory/6040-100-0x000000006D280000-0x000000006D9B6000-memory.dmp