Analysis

  • max time kernel
    150s
  • max time network
    157s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231215-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
  • submitted
    29/12/2023, 19:40

General

  • Target

    020711333fb8898672a822c9af9694b9.exe

  • Size

    412KB

  • MD5

    020711333fb8898672a822c9af9694b9

  • SHA1

    9e933fbb03338c72640a8ebf817513be5c40b895

  • SHA256

    e81a4de91012529f67d65116b5690b6a50aa287beb32054c69d479ad1f85c0a8

  • SHA512

    17842a4477db9c0971a28a76b6b4c4868654c9859d1e40de5a9da9e9b68f0705f14d29cc38073fdc1442e2dbbb676de6893b7991a37c9025c5ee402d38ea8d97

  • SSDEEP

    12288:v33Q9q2bGVy/GSX3B9SiGf5NuiVMDsSWzDIw:v3bcGUXxng56tw

Malware Config

Signatures

  • Drops file in Drivers directory 1 IoCs
  • Executes dropped EXE 3 IoCs
  • Loads dropped DLL 30 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\020711333fb8898672a822c9af9694b9.exe
    "C:\Users\Admin\AppData\Local\Temp\020711333fb8898672a822c9af9694b9.exe"
    1⤵
    • Writes to the Master Boot Record (MBR)
    • Drops file in System32 directory
    • Drops file in Windows directory
    • Suspicious use of WriteProcessMemory
    PID:2052
    • C:\Windows\SysWOW64\regsvr32.exe
      C:\Windows\system32\regsvr32.exe /u /s "C:\Windows\system32\a1l8.dll"
      2⤵
        PID:4188
      • C:\Windows\SysWOW64\regsvr32.exe
        C:\Windows\system32\regsvr32.exe /u /s "C:\Windows\system32\b4cb.dll"
        2⤵
          PID:4812
        • C:\Windows\SysWOW64\regsvr32.exe
          C:\Windows\system32\regsvr32.exe /u /s "C:\Windows\system32\4f3r.dll"
          2⤵
            PID:2288
          • C:\Windows\SysWOW64\regsvr32.exe
            C:\Windows\system32\regsvr32.exe /u /s "C:\Windows\system32\8b4o.dll"
            2⤵
              PID:2796
            • 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:1312
            • C:\Windows\SysWOW64\bffd.exe
              C:\Windows\system32\bffd.exe -i
              2⤵
              • Executes dropped EXE
              PID:3920
            • C:\Windows\SysWOW64\bffd.exe
              C:\Windows\system32\bffd.exe -s
              2⤵
              • Executes dropped EXE
              PID:500
            • C:\Windows\SysWOW64\rundll32.exe
              C:\Windows\system32\rundll32 C:\Windows\system32\841e.dll, Always
              2⤵
              • Loads dropped DLL
              PID:4804
          • 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: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:4668

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            159KB

            MD5

            3b710c6c363b131dcbed1f417b6332f1

            SHA1

            13acdeb0f08c90071584b71a8020a5662751e178

            SHA256

            788e86de5e8080b7938af6640fd49833a406453eb806b1b817ae442d1a2c8e32

            SHA512

            a6c816cb23e6cffc841235c5e38775a29d7a45913a14a7eba7831d8c4c4051de6d52bc50c9e251a4a6e9b656b23586f38c370f9c5b23b5d311c98ce72289d074

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

            Filesize

            229KB

            MD5

            36899723f2124fa6d89e2df5565c73db

            SHA1

            b8dd7df5c0da017cf88ad6fad77407cd1d80b317

            SHA256

            5e441acd8cf8cc0edc48112bd384e85454ea6065757013fa67554e41b0aabe4f

            SHA512

            dd870b3173508c6ad02b7f78e2515d1493e7da90f8568d08e40d09221365f170bedffda475819900dbb9d3a4f8f0e58f2cc98be905e8f4d2fca719106b4650cb

          • C:\Users\Admin\AppData\Local\Temp\h8nil4o8\s.exe

            Filesize

            104KB

            MD5

            c078a3539c6201d385a8d4bd2c79d77e

            SHA1

            f18b6b7c325d0528ce1bf9d3d99f40d3abbf5ace

            SHA256

            e6f634d944f000d64e823b9ef3d8a178700024e32ac696275a9e2927a8568eee

            SHA512

            ae6fe604eaf179866bd982b7ea518e7b1f9e0d7f8fcd91358d189a3d1b947977c4a85b1233af30615d99fef78450f9bd4cc2fec47538d813732a98d4b1ce84ee

          • memory/500-63-0x0000000000020000-0x0000000000022000-memory.dmp

            Filesize

            8KB

          • memory/500-66-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/1312-48-0x0000000000550000-0x0000000000552000-memory.dmp

            Filesize

            8KB

          • memory/1312-47-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/3920-58-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/3920-60-0x00000000001C0000-0x00000000001C2000-memory.dmp

            Filesize

            8KB

          • memory/3920-61-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/4668-88-0x0000000010000000-0x00000000100B2000-memory.dmp

            Filesize

            712KB

          • memory/4668-77-0x0000000010000000-0x00000000100B2000-memory.dmp

            Filesize

            712KB

          • memory/4668-80-0x00000000013B0000-0x00000000013B2000-memory.dmp

            Filesize

            8KB

          • memory/4668-103-0x0000000010000000-0x00000000100B2000-memory.dmp

            Filesize

            712KB

          • memory/4668-96-0x0000000010000000-0x00000000100B2000-memory.dmp

            Filesize

            712KB

          • memory/4728-122-0x00000000012C0000-0x00000000012C2000-memory.dmp

            Filesize

            8KB

          • memory/4728-135-0x00000000012D0000-0x00000000012D2000-memory.dmp

            Filesize

            8KB

          • memory/4728-85-0x0000000000E90000-0x0000000000E92000-memory.dmp

            Filesize

            8KB

          • memory/4728-86-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/4728-190-0x0000000001010000-0x0000000001012000-memory.dmp

            Filesize

            8KB

          • memory/4728-89-0x00000000001C0000-0x00000000001C2000-memory.dmp

            Filesize

            8KB

          • memory/4728-90-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/4728-91-0x0000000000FB0000-0x0000000000FB2000-memory.dmp

            Filesize

            8KB

          • memory/4728-93-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/4728-94-0x0000000000FC0000-0x0000000000FC2000-memory.dmp

            Filesize

            8KB

          • memory/4728-95-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/4728-69-0x0000000000E60000-0x0000000000E62000-memory.dmp

            Filesize

            8KB

          • memory/4728-98-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/4728-99-0x0000000000FD0000-0x0000000000FD2000-memory.dmp

            Filesize

            8KB

          • memory/4728-101-0x0000000000FE0000-0x0000000000FE2000-memory.dmp

            Filesize

            8KB

          • memory/4728-102-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/4728-68-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/4728-105-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/4728-106-0x0000000001270000-0x0000000001272000-memory.dmp

            Filesize

            8KB

          • memory/4728-108-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/4728-109-0x0000000001280000-0x0000000001282000-memory.dmp

            Filesize

            8KB

          • memory/4728-110-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/4728-113-0x0000000001290000-0x0000000001292000-memory.dmp

            Filesize

            8KB

          • memory/4728-115-0x00000000012A0000-0x00000000012A2000-memory.dmp

            Filesize

            8KB

          • memory/4728-116-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/4728-119-0x00000000012B0000-0x00000000012B2000-memory.dmp

            Filesize

            8KB

          • memory/4728-120-0x0000000001290000-0x0000000001292000-memory.dmp

            Filesize

            8KB

          • memory/4728-65-0x00000000001C0000-0x00000000001C2000-memory.dmp

            Filesize

            8KB

          • memory/4728-123-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/4728-125-0x00000000012A0000-0x00000000012A2000-memory.dmp

            Filesize

            8KB

          • memory/4728-127-0x00000000012D0000-0x00000000012D2000-memory.dmp

            Filesize

            8KB

          • memory/4728-128-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/4728-131-0x00000000012E0000-0x00000000012E2000-memory.dmp

            Filesize

            8KB

          • memory/4728-134-0x00000000012F0000-0x00000000012F2000-memory.dmp

            Filesize

            8KB

          • memory/4728-133-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/4728-84-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/4728-136-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/4728-139-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/4728-140-0x0000000001300000-0x0000000001302000-memory.dmp

            Filesize

            8KB

          • memory/4728-142-0x00000000012E0000-0x00000000012E2000-memory.dmp

            Filesize

            8KB

          • memory/4728-143-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/4728-144-0x0000000001310000-0x0000000001312000-memory.dmp

            Filesize

            8KB

          • memory/4728-145-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/4728-148-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/4728-149-0x0000000001320000-0x0000000001322000-memory.dmp

            Filesize

            8KB

          • memory/4728-152-0x0000000001330000-0x0000000001332000-memory.dmp

            Filesize

            8KB

          • memory/4728-151-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/4728-153-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/4728-156-0x0000000001340000-0x0000000001342000-memory.dmp

            Filesize

            8KB

          • memory/4728-158-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/4728-159-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/4728-160-0x0000000001350000-0x0000000001352000-memory.dmp

            Filesize

            8KB

          • memory/4728-161-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/4728-163-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/4728-165-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/4728-166-0x0000000001360000-0x0000000001362000-memory.dmp

            Filesize

            8KB

          • memory/4728-167-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/4728-169-0x0000000001340000-0x0000000001342000-memory.dmp

            Filesize

            8KB

          • memory/4728-171-0x0000000001370000-0x0000000001372000-memory.dmp

            Filesize

            8KB

          • memory/4728-170-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/4728-172-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/4728-175-0x0000000001380000-0x0000000001382000-memory.dmp

            Filesize

            8KB

          • memory/4728-176-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/4728-179-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/4728-180-0x0000000000FF0000-0x0000000000FF2000-memory.dmp

            Filesize

            8KB

          • memory/4728-181-0x0000000010000000-0x0000000010026000-memory.dmp

            Filesize

            152KB

          • memory/4728-183-0x0000000000400000-0x000000000041E000-memory.dmp

            Filesize

            120KB

          • memory/4728-187-0x0000000001000000-0x0000000001002000-memory.dmp

            Filesize

            8KB

          • memory/4804-78-0x0000000010000000-0x00000000100B2000-memory.dmp

            Filesize

            712KB

          • memory/4804-79-0x0000000002D00000-0x0000000002D02000-memory.dmp

            Filesize

            8KB