Overview

overview

10

Static

static

7abff9c8b9...7f.exe

windows7_x64

10

7abff9c8b9...7f.exe

windows10_x64

10

Analysis

  • max time kernel
    117s
  • max time network
    144s
  • platform
    windows10_x64
  • resource
    win10-en-20211208
  • submitted
    28/01/2022, 20:08

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General

  • Target
    7abff9c8b9afca1ca7634e7e52e6408df4b8c1af0a51fb2bdad87364847a267f.exe
  • Size 11.5MB
  • Sample220128-ywj9dacdbp
  • SHA256 7abff9c8b9afca1ca7634e7e52e6408df4b8c1af0a51fb2bdad87364847a267f
  • MD5 SHA1 SHA512
Score
10/10
ruratbackdoordiscoverytrojan

Malware Config

Signatures

  • RuRAT

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

    trojanbackdoorrurat
  • Blocklisted process makes network request 2 IoCs
  • Executes dropped EXE 5 IoCs
  • Checks computer location settings 2 TTPs 2 IoCs

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

  • Loads dropped DLL 1 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

    discovery
  • Enumerates connected drives 3 TTPs 24 IoCs

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

  • Drops file in System32 directory 24 IoCs
  • Drops file in Program Files directory 64 IoCs
  • Drops file in Windows directory 22 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Checks SCSI registry key(s) 3 TTPs 10 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Modifies data under HKEY_USERS 64 IoCs
  • Modifies registry class 24 IoCs
  • Suspicious behavior: EnumeratesProcesses 26 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of SetWindowsHookEx 13 IoCs
  • Suspicious use of WriteProcessMemory 24 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\7abff9c8b9afca1ca7634e7e52e6408df4b8c1af0a51fb2bdad87364847a267f.exe
    "C:\Users\Admin\AppData\Local\Temp\7abff9c8b9afca1ca7634e7e52e6408df4b8c1af0a51fb2bdad87364847a267f.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2324
    • C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\installer.exe
      "C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\installer.exe" /rsetup
      2⤵
      • Executes dropped EXE
      • Checks computer location settings
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:1520
      • C:\Windows\SysWOW64\msiexec.exe
        "C:\Windows\System32\msiexec.exe" /i "C:\Users\Admin\AppData\Local\Temp\7ZipSfx.000\host.msi" /qn
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:980
  • C:\Windows\system32\msiexec.exe
    C:\Windows\system32\msiexec.exe /V
    1⤵
    • Blocklisted process makes network request
    • Enumerates connected drives
    • Drops file in Program Files directory
    • Drops file in Windows directory
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:60
    • C:\Windows\syswow64\MsiExec.exe
      C:\Windows\syswow64\MsiExec.exe -Embedding 963DA22FC8FDB76F9F0B41CDC9C1D4A4
      2⤵
      • Loads dropped DLL
      PID:3244
    • 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\7ZipSfx.000\host.msi"
      2⤵
      • Executes dropped EXE
      • Checks computer location settings
      PID:2584
    • C:\Program Files (x86)\Remote Utilities - Host\rutserv.exe
      "C:\Program Files (x86)\Remote Utilities - Host\rutserv.exe" /silentinstall
      2⤵
      • Executes dropped EXE
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of SetWindowsHookEx
      PID:1292
    • C:\Program Files (x86)\Remote Utilities - Host\rutserv.exe
      "C:\Program Files (x86)\Remote Utilities - Host\rutserv.exe" -dispinstall
      2⤵
      • Executes dropped EXE
      • Modifies data under HKEY_USERS
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:1820
      • C:\Program Files (x86)\Remote Utilities - Host\Monitor\x64\drvinstaller64.exe
        "C:\Program Files (x86)\Remote Utilities - Host\Monitor\x64\drvinstaller64.exe" -dispinstall
        3⤵
        • Executes dropped EXE
        • Drops file in Windows directory
        • Checks SCSI registry key(s)
        • Modifies data under HKEY_USERS
        • Suspicious use of SetWindowsHookEx
        PID:2024
  • \??\c:\windows\system32\svchost.exe
    c:\windows\system32\svchost.exe -k dcomlaunch -s DeviceInstall
    1⤵
    • Checks SCSI registry key(s)
    • Suspicious use of WriteProcessMemory
    PID:2436
    • C:\Windows\system32\DrvInst.exe
      DrvInst.exe "4" "1" "c:\program files (x86)\remote utilities - host\monitor\x64\lockscr.inf" "9" "4351f1d4b" "0000000000000168" "WinSta0\Default" "000000000000016C" "208" "c:\program files (x86)\remote utilities - host\monitor\x64"
      2⤵
      • Drops file in System32 directory
      • Drops file in Windows directory
      • Modifies data under HKEY_USERS
      • Suspicious use of WriteProcessMemory
      PID:3032
      • C:\Windows\system32\rundll32.exe
        rundll32.exe C:\Windows\system32\pnpui.dll,InstallSecurityPromptRunDllW 20 Global\{277c8f65-c87e-d340-865d-651ba99b3169} Global\{a0711e26-3f60-8643-b9e9-bc28e771ecb0} C:\Windows\System32\DriverStore\Temp\{aa24b29e-659d-b84a-a09a-c262ccdae362}\lockscr.inf C:\Windows\System32\DriverStore\Temp\{aa24b29e-659d-b84a-a09a-c262ccdae362}\lockscr.cat
        3⤵
        • Drops file in System32 directory
        • Drops file in Windows directory
        • Modifies data under HKEY_USERS
        PID:3376

Network

        MITRE ATT&CK Enterprise v6

        Replay Monitor

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        Downloads

        memory/1292-203-0x0000000001220000-0x0000000001221000-memory.dmp
        Download

        memory/1520-117-0x0000000004650000-0x0000000004651000-memory.dmp
        Download

        memory/1820-206-0x00000000011B0000-0x00000000011B1000-memory.dmp
        Download

        memory/2584-200-0x0000000000FC0000-0x0000000000FC1000-memory.dmp
        Download