Analysis

  • max time kernel
    150s
  • max time network
    144s
  • platform
    windows7_x64
  • resource
    win7-20231215-en
  • resource tags

    arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
  • submitted
    03/02/2024, 15:46

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.

  • Drops startup file 2 IoCs
  • Executes dropped EXE 4 IoCs
  • Loads dropped DLL 1 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 22 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 31 IoCs
  • Suspicious use of SetWindowsHookEx 5 IoCs
  • Suspicious use of WriteProcessMemory 20 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\RvcDownloader.exe
    "C:\Users\Admin\AppData\Local\Temp\RvcDownloader.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of NtSetInformationThreadHideFromDebugger
    • Suspicious behavior: GetForegroundWindowSpam
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:2060
    • 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:1724
      • 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:2936
  • C:\Windows\system32\taskeng.exe
    taskeng.exe {F354CF51-9751-44DE-BA79-53DD2A4FA7E0} S-1-5-21-928733405-3780110381-2966456290-1000:VTILVGXH\Admin:Interactive:[1]
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2704
    • C:\Users\Admin\AppData\Local\Temp\Server.exe
      C:\Users\Admin\AppData\Local\Temp/Server.exe
      2⤵
      • Executes dropped EXE
      • Suspicious use of NtSetInformationThreadHideFromDebugger
      • Suspicious use of SetWindowsHookEx
      PID:2680
    • C:\Users\Admin\AppData\Local\Temp\Server.exe
      C:\Users\Admin\AppData\Local\Temp/Server.exe
      2⤵
      • Executes dropped EXE
      • Suspicious use of NtSetInformationThreadHideFromDebugger
      • Suspicious use of SetWindowsHookEx
      PID:2480
    • C:\Users\Admin\AppData\Local\Temp\Server.exe
      C:\Users\Admin\AppData\Local\Temp/Server.exe
      2⤵
      • Executes dropped EXE
      • Suspicious use of NtSetInformationThreadHideFromDebugger
      • Suspicious use of SetWindowsHookEx
      PID:2812

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

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

          Filesize

          1.1MB

          MD5

          7f6ce9a396cae9d375cb1a56de268b84

          SHA1

          4129cc4492f057cc2ec78c195c1badd7ab3d9c65

          SHA256

          604d490b9d5dfff01c9fceb085798c6b42f5778c9f125457be654dc4f436ab04

          SHA512

          e3cfe5afbde8b7889767cd9556ddbff2a3652ab139f06f02ec27cbd638d05604b3cbd5dcc2732a62750ced77d32eeab69b92e7eca38fe434121611c8775c314d

        • memory/1724-30-0x0000000000C80000-0x0000000000FF4000-memory.dmp

          Filesize

          3.5MB

        • memory/1724-18-0x0000000005620000-0x0000000005660000-memory.dmp

          Filesize

          256KB

        • memory/1724-40-0x0000000005620000-0x0000000005660000-memory.dmp

          Filesize

          256KB

        • memory/1724-37-0x00000000026A0000-0x00000000026AA000-memory.dmp

          Filesize

          40KB

        • memory/1724-35-0x0000000005620000-0x0000000005660000-memory.dmp

          Filesize

          256KB

        • memory/1724-12-0x0000000000C80000-0x0000000000FF4000-memory.dmp

          Filesize

          3.5MB

        • memory/1724-13-0x0000000000C80000-0x0000000000FF4000-memory.dmp

          Filesize

          3.5MB

        • memory/1724-34-0x0000000074D70000-0x000000007545E000-memory.dmp

          Filesize

          6.9MB

        • memory/1724-16-0x0000000000C80000-0x0000000000FF4000-memory.dmp

          Filesize

          3.5MB

        • memory/1724-15-0x0000000074D70000-0x000000007545E000-memory.dmp

          Filesize

          6.9MB

        • memory/2060-1-0x0000000000EF0000-0x0000000001264000-memory.dmp

          Filesize

          3.5MB

        • memory/2060-17-0x0000000000EF0000-0x0000000001264000-memory.dmp

          Filesize

          3.5MB

        • memory/2060-19-0x0000000074D70000-0x000000007545E000-memory.dmp

          Filesize

          6.9MB

        • memory/2060-3-0x0000000002E60000-0x0000000002EA0000-memory.dmp

          Filesize

          256KB

        • memory/2060-2-0x0000000074D70000-0x000000007545E000-memory.dmp

          Filesize

          6.9MB

        • memory/2060-9-0x0000000005A80000-0x0000000005DF4000-memory.dmp

          Filesize

          3.5MB

        • memory/2060-0-0x0000000000EF0000-0x0000000001264000-memory.dmp

          Filesize

          3.5MB

        • memory/2480-51-0x0000000074D70000-0x000000007545E000-memory.dmp

          Filesize

          6.9MB

        • memory/2480-45-0x0000000001150000-0x00000000014C4000-memory.dmp

          Filesize

          3.5MB

        • memory/2480-48-0x00000000055E0000-0x0000000005620000-memory.dmp

          Filesize

          256KB

        • memory/2480-47-0x0000000001150000-0x00000000014C4000-memory.dmp

          Filesize

          3.5MB

        • memory/2480-46-0x0000000074D70000-0x000000007545E000-memory.dmp

          Filesize

          6.9MB

        • memory/2480-50-0x0000000001150000-0x00000000014C4000-memory.dmp

          Filesize

          3.5MB

        • memory/2680-27-0x0000000001150000-0x00000000014C4000-memory.dmp

          Filesize

          3.5MB

        • memory/2680-26-0x0000000074D70000-0x000000007545E000-memory.dmp

          Filesize

          6.9MB

        • memory/2680-28-0x0000000001150000-0x00000000014C4000-memory.dmp

          Filesize

          3.5MB

        • memory/2680-29-0x0000000000CF0000-0x0000000000D30000-memory.dmp

          Filesize

          256KB

        • memory/2680-33-0x0000000074D70000-0x000000007545E000-memory.dmp

          Filesize

          6.9MB

        • memory/2680-32-0x0000000001150000-0x00000000014C4000-memory.dmp

          Filesize

          3.5MB

        • memory/2680-25-0x0000000001150000-0x00000000014C4000-memory.dmp

          Filesize

          3.5MB

        • memory/2812-59-0x0000000001340000-0x00000000016B4000-memory.dmp

          Filesize

          3.5MB

        • memory/2812-60-0x0000000074D70000-0x000000007545E000-memory.dmp

          Filesize

          6.9MB

        • memory/2812-61-0x0000000001340000-0x00000000016B4000-memory.dmp

          Filesize

          3.5MB

        • memory/2812-62-0x0000000005910000-0x0000000005950000-memory.dmp

          Filesize

          256KB

        • memory/2812-64-0x0000000001340000-0x00000000016B4000-memory.dmp

          Filesize

          3.5MB

        • memory/2812-65-0x0000000074D70000-0x000000007545E000-memory.dmp

          Filesize

          6.9MB