Analysis

  • max time kernel
    157s
  • max time network
    164s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03/02/2024, 16:15

General

  • Target

    RvcDownloader.exe

  • Size

    1.1MB

  • MD5

    7f6ce9a396cae9d375cb1a56de268b84

  • SHA1

    4129cc4492f057cc2ec78c195c1badd7ab3d9c65

  • SHA256

    604d490b9d5dfff01c9fceb085798c6b42f5778c9f125457be654dc4f436ab04

  • SHA512

    e3cfe5afbde8b7889767cd9556ddbff2a3652ab139f06f02ec27cbd638d05604b3cbd5dcc2732a62750ced77d32eeab69b92e7eca38fe434121611c8775c314d

  • SSDEEP

    24576:YAKoSJz+0Iw0kyFKLjA4OInTbghKT+5YqyIkIIWV+05rk4o/iq6MH:HCS7wDNjA4OIPiDGqyIkHfy0N

Malware Config

Signatures

  • njRAT/Bladabindi

    Widely used RAT written in .NET.

  • Checks computer location settings 2 TTPs 1 IoCs

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

  • Drops startup file 2 IoCs
  • Executes dropped EXE 3 IoCs
  • Adds Run key to start application 2 TTPs 2 IoCs
  • Legitimate hosting services abused for malware hosting/C2 1 TTPs 1 IoCs
  • Suspicious use of NtSetInformationThreadHideFromDebugger 18 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious behavior: GetForegroundWindowSpam 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 29 IoCs
  • Suspicious use of SetWindowsHookEx 3 IoCs
  • Suspicious use of WriteProcessMemory 6 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\RvcDownloader.exe
    "C:\Users\Admin\AppData\Local\Temp\RvcDownloader.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of NtSetInformationThreadHideFromDebugger
    • Suspicious behavior: GetForegroundWindowSpam
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:2568
    • C:\Users\Admin\AppData\Local\Temp\Dllhost.exe
      "C:\Users\Admin\AppData\Local\Temp\Dllhost.exe"
      2⤵
      • Drops startup file
      • Executes dropped EXE
      • Adds Run key to start application
      • Suspicious use of NtSetInformationThreadHideFromDebugger
      • Suspicious behavior: GetForegroundWindowSpam
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:2544
      • C:\Windows\SysWOW64\schtasks.exe
        schtasks /create /sc minute /mo 1 /tn Server /tr C:\Users\Admin\AppData\Local\Temp/Server.exe
        3⤵
        • Creates scheduled task(s)
        PID:1916
  • C:\Windows\system32\svchost.exe
    C:\Windows\system32\svchost.exe -k LocalSystemNetworkRestricted -p -s DisplayEnhancementService
    1⤵
      PID:4688
    • C:\Users\Admin\AppData\Local\Temp\Server.exe
      C:\Users\Admin\AppData\Local\Temp/Server.exe
      1⤵
      • Executes dropped EXE
      • Suspicious use of NtSetInformationThreadHideFromDebugger
      • Suspicious use of SetWindowsHookEx
      PID:3084
    • C:\Users\Admin\AppData\Local\Temp\Server.exe
      C:\Users\Admin\AppData\Local\Temp/Server.exe
      1⤵
      • Executes dropped EXE
      PID:4868

    Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

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          Downloads

          • C:\Users\Admin\AppData\Local\Temp\Dllhost.exe

            Filesize

            1.1MB

            MD5

            7f6ce9a396cae9d375cb1a56de268b84

            SHA1

            4129cc4492f057cc2ec78c195c1badd7ab3d9c65

            SHA256

            604d490b9d5dfff01c9fceb085798c6b42f5778c9f125457be654dc4f436ab04

            SHA512

            e3cfe5afbde8b7889767cd9556ddbff2a3652ab139f06f02ec27cbd638d05604b3cbd5dcc2732a62750ced77d32eeab69b92e7eca38fe434121611c8775c314d

          • memory/2544-36-0x0000000007530000-0x000000000753A000-memory.dmp

            Filesize

            40KB

          • memory/2544-34-0x00000000060B0000-0x00000000060C0000-memory.dmp

            Filesize

            64KB

          • memory/2544-30-0x0000000005F00000-0x0000000005F0A000-memory.dmp

            Filesize

            40KB

          • memory/2544-33-0x0000000073DA0000-0x0000000074550000-memory.dmp

            Filesize

            7.7MB

          • memory/2544-32-0x0000000007300000-0x0000000007318000-memory.dmp

            Filesize

            96KB

          • memory/2544-29-0x0000000000A30000-0x0000000000DA4000-memory.dmp

            Filesize

            3.5MB

          • memory/2544-31-0x0000000006400000-0x0000000006466000-memory.dmp

            Filesize

            408KB

          • memory/2544-24-0x00000000060B0000-0x00000000060C0000-memory.dmp

            Filesize

            64KB

          • memory/2544-17-0x0000000000A30000-0x0000000000DA4000-memory.dmp

            Filesize

            3.5MB

          • memory/2544-22-0x0000000073DA0000-0x0000000074550000-memory.dmp

            Filesize

            7.7MB

          • memory/2544-21-0x0000000000A30000-0x0000000000DA4000-memory.dmp

            Filesize

            3.5MB

          • memory/2568-0-0x0000000000A40000-0x0000000000DB4000-memory.dmp

            Filesize

            3.5MB

          • memory/2568-1-0x0000000073DA0000-0x0000000074550000-memory.dmp

            Filesize

            7.7MB

          • memory/2568-3-0x0000000006000000-0x000000000609C000-memory.dmp

            Filesize

            624KB

          • memory/2568-2-0x0000000000A40000-0x0000000000DB4000-memory.dmp

            Filesize

            3.5MB

          • memory/2568-8-0x00000000063F0000-0x0000000006482000-memory.dmp

            Filesize

            584KB

          • memory/2568-7-0x00000000068A0000-0x0000000006E44000-memory.dmp

            Filesize

            5.6MB

          • memory/2568-6-0x0000000003C50000-0x0000000003C60000-memory.dmp

            Filesize

            64KB

          • memory/2568-23-0x0000000073DA0000-0x0000000074550000-memory.dmp

            Filesize

            7.7MB

          • memory/2568-20-0x0000000000A40000-0x0000000000DB4000-memory.dmp

            Filesize

            3.5MB

          • memory/2568-5-0x0000000003C50000-0x0000000003C60000-memory.dmp

            Filesize

            64KB

          • memory/3084-41-0x0000000000540000-0x00000000008B4000-memory.dmp

            Filesize

            3.5MB

          • memory/3084-43-0x0000000073DA0000-0x0000000074550000-memory.dmp

            Filesize

            7.7MB

          • memory/3084-44-0x0000000000540000-0x00000000008B4000-memory.dmp

            Filesize

            3.5MB

          • memory/3084-45-0x0000000005850000-0x0000000005860000-memory.dmp

            Filesize

            64KB

          • memory/3084-49-0x0000000000540000-0x00000000008B4000-memory.dmp

            Filesize

            3.5MB

          • memory/3084-50-0x0000000073DA0000-0x0000000074550000-memory.dmp

            Filesize

            7.7MB

          • memory/4868-57-0x0000000000540000-0x00000000008B4000-memory.dmp

            Filesize

            3.5MB

          • memory/4868-61-0x0000000000540000-0x00000000008B4000-memory.dmp

            Filesize

            3.5MB