Analysis

  • max time kernel
    150s
  • max time network
    156s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240319-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240319-enlocale:en-usos:windows10-2004-x64system
  • submitted
    20/03/2024, 20:00

General

  • Target
    d9b0fb92a02937b6a631213dbb629a3f.dll
  • Size 472KB
  • Sample240320-yrfqdshe63
  • SHA256 2961edba7105ab3ad7388b75500ecd56dc60682af4839c1210bc06a40309e056
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • Drops file in Drivers directory 1 IoCs
  • Executes dropped EXE 4 IoCs
  • Loads dropped DLL 32 IoCs
  • Adds Run key to start application 2 TTPs 1 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 19 IoCs
  • Drops file in Windows directory 13 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Modifies registry class 47 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 33 IoCs

Processes

  • C:\Windows\system32\rundll32.exe
    rundll32.exe C:\Users\Admin\AppData\Local\Temp\d9b0fb92a02937b6a631213dbb629a3f.dll,#1
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:3824
    • C:\Windows\SysWOW64\rundll32.exe
      rundll32.exe C:\Users\Admin\AppData\Local\Temp\d9b0fb92a02937b6a631213dbb629a3f.dll,#1
      2⤵
      • Adds Run key to start application
      • Writes to the Master Boot Record (MBR)
      • Drops file in System32 directory
      • Drops file in Windows directory
      • Suspicious use of WriteProcessMemory
      PID:4612
      • C:\Windows\SysWOW64\regsvr32.exe
        C:\Windows\system32\regsvr32.exe /u /s "C:\Windows\system32/45l6.dll"
        3⤵
          PID:492
        • C:\Windows\SysWOW64\regsvr32.exe
          C:\Windows\system32\regsvr32.exe /u /s "C:\Windows\system32/21c2.dll"
          3⤵
            PID:1640
          • C:\Windows\SysWOW64\regsvr32.exe
            C:\Windows\system32\regsvr32.exe /u /s "C:\Windows\system32/d0br.dll"
            3⤵
              PID:4860
            • C:\Windows\SysWOW64\regsvr32.exe
              C:\Windows\system32\regsvr32.exe /u /s "C:\Windows\system32/2bdo.dll"
              3⤵
                PID:2004
              • C:\Windows\SysWOW64\regsvr32.exe
                C:\Windows\system32\regsvr32.exe /s "C:\Windows\system32/2bdo.dll"
                3⤵
                • Loads dropped DLL
                • Installs/modifies Browser Helper Object
                • Modifies registry class
                PID:4796
              • C:\Windows\SysWOW64\b15d.exe
                C:\Windows\system32/b15d.exe -i
                3⤵
                • Executes dropped EXE
                PID:1904
              • C:\Windows\SysWOW64\b15d.exe
                C:\Windows\system32/b15d.exe -s
                3⤵
                • Executes dropped EXE
                PID:1992
              • C:\Users\Admin\AppData\Local\Temp\h8nil4o8\mtv.exe
                C:\Users\Admin\AppData\Local\Temp\h8nil4o8\mtv.exe
                3⤵
                • Executes dropped EXE
                • Drops file in System32 directory
                • Suspicious use of SetWindowsHookEx
                PID:2956
              • C:\Windows\SysWOW64\rundll32.exe
                C:\Windows\system32\rundll32 C:\Windows\system32/b15e.dll, Always
                3⤵
                • Loads dropped DLL
                PID:5060
          • C:\Windows\SysWOW64\b15d.exe
            C:\Windows\SysWOW64\b15d.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:5056
            • C:\Windows\SysWOW64\rundll32.exe
              C:\Windows\system32\rundll32 C:\Windows\system32/b15e.dll,Always
              2⤵
              • Loads dropped DLL
              • Writes to the Master Boot Record (MBR)
              • Drops file in System32 directory
              PID:4744
          • C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
            "C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --mojo-platform-channel-handle=4304 --field-trial-handle=2000,i,9877262470271371196,11878025205711850266,262144 --variations-seed-version /prefetch:8
            1⤵
              PID:452

            Network

                  MITRE ATT&CK Enterprise v15

                  Replay Monitor

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                  Downloads

                  b.dll

                  • Path C:\Users\Admin\AppData\Local\Temp\h8nil4o8\b.dll
                  • Size 164KB
                  • SHA256 e5866d1dc680926b0af54ddac6736a977e545e5dfbdf13b28712d284dceb2622
                  • MD5 SHA1 SHA512 SSDEEP

                  mtv.exe

                  • Path C:\Users\Admin\AppData\Local\Temp\h8nil4o8\mtv.exe
                  • Size 52KB
                  • SHA256 c8347edf87efce61880c7bcc4f57e662c2fbe1b9c30967be9630ccc0ddcc5470
                  • MD5 SHA1 SHA512 SSDEEP

                  p.dll

                  • Path C:\Users\Admin\AppData\Local\Temp\h8nil4o8\p.dll
                  • Size 506KB
                  • SHA256 e1a21500081965acb55802601e8fe3681e2021ab349d355774d4c37d9bedc2ae
                  • MD5 SHA1 SHA512 SSDEEP

                  s.exe

                  • Path C:\Users\Admin\AppData\Local\Temp\h8nil4o8\s.exe
                  • Size 184KB
                  • SHA256 912442a6190e9de8802560c4793cf029151aecbb1486025d0c89d857cca1c1fa
                  • MD5 SHA1 SHA512 SSDEEP

                  tmp.exe

                  • Path C:\Users\Admin\AppData\Local\Temp\ufyh\tmp.exe
                  • Size 60KB
                  • SHA256 e11baff2187e07cda07da7536aa4efbc5633614f9be28f44c19a8dc82ea1f273
                  • MD5 SHA1 SHA512 SSDEEP

                  b15d.exe

                  • Path C:\Windows\SysWOW64\b15d.exe
                  • Size 83KB
                  • SHA256 3a3163e3fe018585cc9920f7d1e9e07dd22add2d1e7c512c985fd0bedf9edece
                  • MD5 SHA1 SHA512 SSDEEP

                  b15d.exe

                  • Path C:\Windows\SysWOW64\b15d.exe
                  • Size 139KB
                  • SHA256 fc6e99536a6b5fd1daab2b7e6b2001b5d5a1d611cdaa185c73de29f3ae166f6b
                  • MD5 SHA1 SHA512 SSDEEP