Analysis

  • max time kernel
    150s
  • max time network
    155s
  • platform
    windows10-1703_x64
  • resource
    win10-20231215-en
  • resource tags

    arch:x64arch:x86image:win10-20231215-enlocale:en-usos:windows10-1703-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.

  • Drops startup file 2 IoCs
  • Executes dropped EXE 4 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 6 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\RvcDownloader.exe
    "C:\Users\Admin\AppData\Local\Temp\RvcDownloader.exe"
    1⤵
    • Suspicious use of NtSetInformationThreadHideFromDebugger
    • Suspicious behavior: GetForegroundWindowSpam
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:2124
    • 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:4052
      • 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:3960
  • 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:3776
  • 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:4616
  • 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:2892

Network

        MITRE ATT&CK Enterprise v15

        Replay Monitor

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        Downloads

        • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0_32\UsageLogs\Server.exe.log

          Filesize

          507B

          MD5

          0de4a673c46d192f575c41e7c80ffc3e

          SHA1

          7a1da7e8ec2efd904ecb237ebedd4d7a3ee826f1

          SHA256

          c18d0ff8e7b83a8623a8515d91d65f68deef6da9f68d84886864177f45acbf65

          SHA512

          b505619848b2f6038e68a2d7baaa4cf314d39023a5b7a32001262ecda03a905986ac8a45a249745e29637b0acfaba1ae06bfaecc678283a808e6f9f4b455e209

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

          Filesize

          1.1MB

          MD5

          7f6ce9a396cae9d375cb1a56de268b84

          SHA1

          4129cc4492f057cc2ec78c195c1badd7ab3d9c65

          SHA256

          604d490b9d5dfff01c9fceb085798c6b42f5778c9f125457be654dc4f436ab04

          SHA512

          e3cfe5afbde8b7889767cd9556ddbff2a3652ab139f06f02ec27cbd638d05604b3cbd5dcc2732a62750ced77d32eeab69b92e7eca38fe434121611c8775c314d

        • memory/2124-0-0x0000000000040000-0x00000000003B4000-memory.dmp

          Filesize

          3.5MB

        • memory/2124-17-0x0000000073250000-0x000000007393E000-memory.dmp

          Filesize

          6.9MB

        • memory/2124-4-0x0000000003490000-0x00000000034A0000-memory.dmp

          Filesize

          64KB

        • memory/2124-5-0x0000000005C80000-0x000000000617E000-memory.dmp

          Filesize

          5.0MB

        • memory/2124-6-0x0000000005820000-0x00000000058B2000-memory.dmp

          Filesize

          584KB

        • memory/2124-2-0x0000000073250000-0x000000007393E000-memory.dmp

          Filesize

          6.9MB

        • memory/2124-1-0x0000000000040000-0x00000000003B4000-memory.dmp

          Filesize

          3.5MB

        • memory/2124-15-0x0000000000040000-0x00000000003B4000-memory.dmp

          Filesize

          3.5MB

        • memory/2124-3-0x00000000054E0000-0x000000000557C000-memory.dmp

          Filesize

          624KB

        • memory/2892-67-0x0000000000930000-0x0000000000CA4000-memory.dmp

          Filesize

          3.5MB

        • memory/2892-66-0x0000000000930000-0x0000000000CA4000-memory.dmp

          Filesize

          3.5MB

        • memory/2892-65-0x0000000073250000-0x000000007393E000-memory.dmp

          Filesize

          6.9MB

        • memory/2892-64-0x0000000000930000-0x0000000000CA4000-memory.dmp

          Filesize

          3.5MB

        • memory/2892-68-0x0000000005270000-0x0000000005280000-memory.dmp

          Filesize

          64KB

        • memory/3776-34-0x0000000073250000-0x000000007393E000-memory.dmp

          Filesize

          6.9MB

        • memory/3776-39-0x0000000073250000-0x000000007393E000-memory.dmp

          Filesize

          6.9MB

        • memory/3776-38-0x0000000000930000-0x0000000000CA4000-memory.dmp

          Filesize

          3.5MB

        • memory/3776-35-0x0000000000930000-0x0000000000CA4000-memory.dmp

          Filesize

          3.5MB

        • memory/3776-32-0x0000000000930000-0x0000000000CA4000-memory.dmp

          Filesize

          3.5MB

        • memory/4052-18-0x0000000073250000-0x000000007393E000-memory.dmp

          Filesize

          6.9MB

        • memory/4052-24-0x0000000005710000-0x000000000571A000-memory.dmp

          Filesize

          40KB

        • memory/4052-31-0x0000000073250000-0x000000007393E000-memory.dmp

          Filesize

          6.9MB

        • memory/4052-28-0x0000000000270000-0x00000000005E4000-memory.dmp

          Filesize

          3.5MB

        • memory/4052-26-0x00000000066D0000-0x00000000066E8000-memory.dmp

          Filesize

          96KB

        • memory/4052-40-0x0000000006810000-0x000000000681A000-memory.dmp

          Filesize

          40KB

        • memory/4052-13-0x0000000000270000-0x00000000005E4000-memory.dmp

          Filesize

          3.5MB

        • memory/4052-25-0x0000000005880000-0x00000000058E6000-memory.dmp

          Filesize

          408KB

        • memory/4052-19-0x0000000000270000-0x00000000005E4000-memory.dmp

          Filesize

          3.5MB

        • memory/4052-33-0x00000000055C0000-0x00000000055D0000-memory.dmp

          Filesize

          64KB

        • memory/4052-16-0x0000000000270000-0x00000000005E4000-memory.dmp

          Filesize

          3.5MB

        • memory/4052-20-0x00000000055C0000-0x00000000055D0000-memory.dmp

          Filesize

          64KB

        • memory/4616-51-0x0000000000930000-0x0000000000CA4000-memory.dmp

          Filesize

          3.5MB

        • memory/4616-56-0x0000000073250000-0x000000007393E000-memory.dmp

          Filesize

          6.9MB

        • memory/4616-55-0x0000000000930000-0x0000000000CA4000-memory.dmp

          Filesize

          3.5MB

        • memory/4616-53-0x0000000003080000-0x0000000003090000-memory.dmp

          Filesize

          64KB

        • memory/4616-52-0x0000000000930000-0x0000000000CA4000-memory.dmp

          Filesize

          3.5MB

        • memory/4616-50-0x0000000073250000-0x000000007393E000-memory.dmp

          Filesize

          6.9MB

        • memory/4616-47-0x0000000000930000-0x0000000000CA4000-memory.dmp

          Filesize

          3.5MB