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Analysis

  • max time kernel
    112s
  • max time network
    150s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    26/12/2023, 01:22

General

  • Target

    48fad24a6419341ce64b063be81e402a.exe

  • Size

    484KB

  • MD5

    48fad24a6419341ce64b063be81e402a

  • SHA1

    aaab00c61a68acaea1f687d3291df88db3092754

  • SHA256

    e1a5b2392f673f9d652727956690a6f135f5c2d129729a23729bda78f18e32d0

  • SHA512

    680d13e3cb49bb3a5712f5f9dff27b9800bdff1287eac9219e5f97061cb99465ff0518c17d268ff31560e089e56525a56c43537d8c06b91738fb343a51e0cd40

  • SSDEEP

    12288:SLdIQpe9G51q7UeRtFB/4zRbqQeg1GNGNrUr8Jyn:SB/sG6waFBARl1mjr8wn

Malware Config

Signatures

  • Drops file in Drivers directory 1 IoCs
  • Executes dropped EXE 3 IoCs
  • Loads dropped DLL 26 IoCs
  • Installs/modifies Browser Helper Object 2 TTPs 2 IoCs

    BHOs are DLL modules which act as plugins for Internet Explorer.

  • Writes to the Master Boot Record (MBR) 1 TTPs 3 IoCs

    Bootkits write to the MBR to gain persistence at a level below the operating system.

  • Drops file in System32 directory 18 IoCs
  • Drops file in Windows directory 13 IoCs
  • Modifies registry class 47 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of WriteProcessMemory 27 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\48fad24a6419341ce64b063be81e402a.exe
    "C:\Users\Admin\AppData\Local\Temp\48fad24a6419341ce64b063be81e402a.exe"
    1⤵
    • Writes to the Master Boot Record (MBR)
    • Drops file in System32 directory
    • Drops file in Windows directory
    • Suspicious use of WriteProcessMemory
    PID:2484
    • C:\Windows\SysWOW64\regsvr32.exe
      C:\Windows\system32\regsvr32.exe /u /s "C:\Windows\system32\8b4o.dll"
      2⤵
        PID:324
      • C:\Windows\SysWOW64\regsvr32.exe
        C:\Windows\system32\regsvr32.exe /s "C:\Windows\system32\8b4o.dll"
        2⤵
        • Loads dropped DLL
        • Installs/modifies Browser Helper Object
        • Modifies registry class
        PID:4360
      • C:\Windows\SysWOW64\bffd.exe
        C:\Windows\system32\bffd.exe -s
        2⤵
        • Executes dropped EXE
        PID:5108
      • C:\Windows\SysWOW64\bffd.exe
        C:\Windows\system32\bffd.exe -i
        2⤵
        • Executes dropped EXE
        PID:4664
      • C:\Windows\SysWOW64\regsvr32.exe
        C:\Windows\system32\regsvr32.exe /u /s "C:\Windows\system32\4f3r.dll"
        2⤵
          PID:1732
        • C:\Windows\SysWOW64\regsvr32.exe
          C:\Windows\system32\regsvr32.exe /u /s "C:\Windows\system32\b4cb.dll"
          2⤵
            PID:2044
          • C:\Windows\SysWOW64\regsvr32.exe
            C:\Windows\system32\regsvr32.exe /u /s "C:\Windows\system32\a1l8.dll"
            2⤵
              PID:4728
            • C:\Windows\SysWOW64\rundll32.exe
              C:\Windows\system32\rundll32 C:\Windows\system32\841e.dll, Always
              2⤵
              • Loads dropped DLL
              • Writes to the Master Boot Record (MBR)
              • Drops file in System32 directory
              PID:5004
          • C:\Windows\SysWOW64\bffd.exe
            C:\Windows\SysWOW64\bffd.exe
            1⤵
            • Drops file in Drivers directory
            • Executes dropped EXE
            • Loads dropped DLL
            • Writes to the Master Boot Record (MBR)
            • Suspicious behavior: EnumeratesProcesses
            • Suspicious use of WriteProcessMemory
            PID:2024
            • C:\Windows\SysWOW64\rundll32.exe
              C:\Windows\system32\rundll32 C:\Windows\system32\841e.dll,Always
              2⤵
              • Loads dropped DLL
              PID:1692

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\h8nil4o8\b.dll

            Filesize

            94KB

            MD5

            1ae08166022de75f393c49ff7e37c9bf

            SHA1

            1c79159f6a7ee289c67a397de870c3ada4a77d65

            SHA256

            cb0597a2c924d5b9b94342dbc53179df3ab4211e7f335efedfaafd67927e870c

            SHA512

            bce409f834bb25eb6d015cba34ad6daca1a0d6466cc5a3b2b487b3be1c5314617b16b85b7f62f8c56ccb075a8e00dfe09950e42134a3242cac41dc2c20e8bb29

          • C:\Users\Admin\AppData\Local\Temp\h8nil4o8\p.dll

            Filesize

            209KB

            MD5

            c3b55b95371e14095479e15bdcf6631c

            SHA1

            a3384a0102cbdd96334b4c32466c8651baa1b6fe

            SHA256

            e6dfca82e901f68320791485807a8d6506bab6c2d2590388f4f0b4da8e103ab9

            SHA512

            ef3e56336b87aeae69e7b630de853ea97d58a722bb051f8b27a77b12c56271f490dd7cefa78bdf383c7dca106cf986ba47a48fad4157dd6c75c33d6eb1bf3654

          • C:\Windows\SysWOW64\8b4o.dll

            Filesize

            93KB

            MD5

            e9611acc4fc4a4178b153377e88d88be

            SHA1

            d20812d47df927fcfcba8f3bdc8c2e7d3824f672

            SHA256

            c999356a2d8ee84b6533eded8c6cd412e45cc01e498cd43e07b804d487bbd53a

            SHA512

            ed14ac1e79cb558b4330551a281c0ee99e792d6a22177aafecb2ce1b33b8c5c6de6eef30a472fe72ce9ae5a7f6b4a3e192691c6345fbf76b2856509a0a0e23ec

          • memory/1692-78-0x0000000010000000-0x00000000100B2000-memory.dmp

            Filesize

            712KB

          • memory/1692-80-0x0000000000DA0000-0x0000000000DA2000-memory.dmp

            Filesize

            8KB

          • memory/2024-118-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/2024-124-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/2024-192-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/2024-186-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/2024-183-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/2024-180-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/2024-182-0x00000000013A0000-0x00000000013A2000-memory.dmp

            Filesize

            8KB

          • memory/2024-181-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/2024-65-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/2024-177-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/2024-178-0x0000000001390000-0x0000000001392000-memory.dmp

            Filesize

            8KB

          • memory/2024-69-0x00000000006F0000-0x00000000006F2000-memory.dmp

            Filesize

            8KB

          • memory/2024-68-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/2024-85-0x0000000000D80000-0x0000000000D82000-memory.dmp

            Filesize

            8KB

          • memory/2024-86-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/2024-90-0x0000000000D90000-0x0000000000D92000-memory.dmp

            Filesize

            8KB

          • memory/2024-89-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/2024-174-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/2024-93-0x0000000000DA0000-0x0000000000DA2000-memory.dmp

            Filesize

            8KB

          • memory/2024-92-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/2024-94-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/2024-172-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/2024-98-0x0000000000EC0000-0x0000000000EC2000-memory.dmp

            Filesize

            8KB

          • memory/2024-97-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/2024-101-0x0000000000ED0000-0x0000000000ED2000-memory.dmp

            Filesize

            8KB

          • memory/2024-100-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/2024-102-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/2024-106-0x0000000001270000-0x0000000001272000-memory.dmp

            Filesize

            8KB

          • memory/2024-105-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/2024-173-0x0000000001380000-0x0000000001382000-memory.dmp

            Filesize

            8KB

          • memory/2024-109-0x0000000001280000-0x0000000001282000-memory.dmp

            Filesize

            8KB

          • memory/2024-108-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/2024-110-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/2024-114-0x0000000001290000-0x0000000001292000-memory.dmp

            Filesize

            8KB

          • memory/2024-113-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/2024-116-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/2024-117-0x00000000012A0000-0x00000000012A2000-memory.dmp

            Filesize

            8KB

          • memory/2024-66-0x00000000001C0000-0x00000000001C2000-memory.dmp

            Filesize

            8KB

          • memory/2024-121-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/2024-122-0x00000000012B0000-0x00000000012B2000-memory.dmp

            Filesize

            8KB

          • memory/2024-170-0x0000000001370000-0x0000000001372000-memory.dmp

            Filesize

            8KB

          • memory/2024-125-0x00000000012C0000-0x00000000012C2000-memory.dmp

            Filesize

            8KB

          • memory/2024-126-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/2024-129-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/2024-130-0x00000000012D0000-0x00000000012D2000-memory.dmp

            Filesize

            8KB

          • memory/2024-132-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/2024-133-0x00000000012E0000-0x00000000012E2000-memory.dmp

            Filesize

            8KB

          • memory/2024-134-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/2024-137-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/2024-138-0x00000000012F0000-0x00000000012F2000-memory.dmp

            Filesize

            8KB

          • memory/2024-140-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/2024-141-0x0000000001300000-0x0000000001302000-memory.dmp

            Filesize

            8KB

          • memory/2024-142-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/2024-145-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/2024-146-0x0000000001310000-0x0000000001312000-memory.dmp

            Filesize

            8KB

          • memory/2024-149-0x0000000001320000-0x0000000001322000-memory.dmp

            Filesize

            8KB

          • memory/2024-148-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/2024-150-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/2024-154-0x0000000001330000-0x0000000001332000-memory.dmp

            Filesize

            8KB

          • memory/2024-153-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/2024-157-0x0000000001340000-0x0000000001342000-memory.dmp

            Filesize

            8KB

          • memory/2024-156-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/2024-158-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/2024-162-0x0000000001350000-0x0000000001352000-memory.dmp

            Filesize

            8KB

          • memory/2024-161-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/2024-164-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/2024-165-0x0000000001360000-0x0000000001362000-memory.dmp

            Filesize

            8KB

          • memory/2024-166-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/2024-169-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/4360-47-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/4360-48-0x0000000001280000-0x0000000001282000-memory.dmp

            Filesize

            8KB

          • memory/4664-61-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/4664-58-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/4664-60-0x00000000001C0000-0x00000000001C2000-memory.dmp

            Filesize

            8KB

          • memory/5004-104-0x0000000010000000-0x00000000100B2000-memory.dmp

            Filesize

            712KB

          • memory/5004-96-0x0000000010000000-0x00000000100B2000-memory.dmp

            Filesize

            712KB

          • memory/5004-88-0x0000000010000000-0x00000000100B2000-memory.dmp

            Filesize

            712KB

          • memory/5004-79-0x0000000010000000-0x00000000100B2000-memory.dmp

            Filesize

            712KB

          • memory/5004-81-0x0000000000B90000-0x0000000000B92000-memory.dmp

            Filesize

            8KB

          • memory/5108-70-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/5108-63-0x0000000000020000-0x0000000000022000-memory.dmp

            Filesize

            8KB