Analysis

  • max time kernel
    102s
  • max time network
    106s
  • platform
    windows7_x64
  • resource
    win7-20230220-en
  • resource tags

    arch:x64arch:x86image:win7-20230220-enlocale:en-usos:windows7-x64system
  • submitted
    08/03/2023, 10:25

General

  • Target
    20899b27a51843830df2084dce88cc97d752a7e2dd1a64ad3238080a145fceaf.docx
  • Size 10KB
  • Sample230308-mgcefafd86
  • SHA256 20899b27a51843830df2084dce88cc97d752a7e2dd1a64ad3238080a145fceaf
  • MD5 SHA1 SHA512 SSDEEP
Score
8/10

Malware Config

Signatures

  • Blocklisted process makes network request 1 IoCs
  • Downloads MZ/PE file
  • Abuses OpenXML format to download file from external location 2 IoCs
  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 1 IoCs
  • Uses the VBS compiler for execution 1 TTPs
  • Drops file in System32 directory 1 IoCs
  • Drops file in Windows directory 1 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Office loads VBA resources, possible macro or embedded object present
  • Launches Equation Editor 1 TTPs 1 IoCs

    Equation Editor is an old Office component often targeted by exploits such as CVE-2017-11882.

  • Modifies Internet Explorer settings 1 TTPs 31 IoCs
  • Modifies registry class 64 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 2 IoCs
  • Suspicious use of AdjustPrivilegeToken 3 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 12 IoCs

Processes

  • C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE
    "C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE" /n "C:\Users\Admin\AppData\Local\Temp\20899b27a51843830df2084dce88cc97d752a7e2dd1a64ad3238080a145fceaf.docx"
    1⤵
    • Abuses OpenXML format to download file from external location
    • Drops file in Windows directory
    • Modifies Internet Explorer settings
    • Modifies registry class
    • Suspicious behavior: AddClipboardFormatListener
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of SetWindowsHookEx
    • Suspicious use of WriteProcessMemory
    PID:2012
    • C:\Windows\splwow64.exe
      C:\Windows\splwow64.exe 12288
      2⤵
        PID:1532
    • C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE
      "C:\Program Files (x86)\Common Files\Microsoft Shared\EQUATION\EQNEDT32.EXE" -Embedding
      1⤵
      • Blocklisted process makes network request
      • Loads dropped DLL
      • Launches Equation Editor
      • Suspicious use of WriteProcessMemory
      PID:1096
      • C:\Users\Public\vbc.exe
        "C:\Users\Public\vbc.exe"
        2⤵
        • Executes dropped EXE
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of WriteProcessMemory
        PID:1592
        • C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
          "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" Add-MpPreference -ExclusionPath "C:\Users\Admin\AppData\Roaming\TdPQEEr.exe"
          3⤵
          • Drops file in System32 directory
          • Suspicious behavior: EnumeratesProcesses
          • Suspicious use of AdjustPrivilegeToken
          PID:924

    Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

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          Downloads

          FSD-CNRY.FSD

          • Path C:\Users\Admin\AppData\Local\Microsoft\Office\14.0\OfficeFileCache\LocalCacheFileEditManager\FSD-CNRY.FSD
          • Size 128KB
          • SHA256 1a888331b6b8652d48125c5c56c8fb28f2b96e79d8b0e60b45e9b26445042046
          • MD5 SHA1 SHA512 SSDEEP

          FSD-{864F43B9-781C-4AA1-9C13-A81A0F77979F}.FSD

          • Path C:\Users\Admin\AppData\Local\Microsoft\Office\14.0\OfficeFileCache\LocalCacheFileEditManager\FSD-{864F43B9-781C-4AA1-9C13-A81A0F77979F}.FSD
          • Size 128KB
          • SHA256 dd3ced2e8a93da57372545ca4fa35b44bb866d06417cc94795e01f8bb119bc88
          • MD5 SHA1 SHA512 SSDEEP

          31.31.31[1].doc

          • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\Temporary Internet Files\Content.IE5\ACT9UUKV\31.31.31[1].doc
          • Size 11KB
          • SHA256 caa7719f6020d911cc3e6ad542331508e22180445d7fa9206bf60193cb69d5e9
          • MD5 SHA1 SHA512 SSDEEP

          {F6AF17A4-D285-4344-82AF-6399E81286A3}

          • Path C:\Users\Admin\AppData\Local\Temp\{F6AF17A4-D285-4344-82AF-6399E81286A3}
          • Size 128KB
          • SHA256 d073acf15bb90af722305442f6611ad998c4403853c1899dd174be18516fd1d7
          • MD5 SHA1 SHA512 SSDEEP

          index.dat

          • Path C:\Users\Admin\AppData\Roaming\Microsoft\Office\Recent\index.dat
          • Size 72B
          • SHA256 1252f040391357cb272f398f38980dff24c1b917a53044cdde512602085fa5cf
          • MD5 SHA1 SHA512

          Normal.dotm

          • Path C:\Users\Admin\AppData\Roaming\Microsoft\Templates\Normal.dotm
          • Size 20KB
          • SHA256 f970ddde44a839325432766adc464ff6b328554a758b28aae4f70587144ae692
          • MD5 SHA1 SHA512 SSDEEP

          vbc.exe

          • Path C:\Users\Public\vbc.exe
          • Size 1003KB
          • SHA256 120de63b8f726ad218289a7562f96160b9a01b5cc62bf98761628b1667502bfa
          • MD5 SHA1 SHA512 SSDEEP

          vbc.exe

          • Path C:\Users\Public\vbc.exe
          • Size 1003KB
          • SHA256 120de63b8f726ad218289a7562f96160b9a01b5cc62bf98761628b1667502bfa
          • MD5 SHA1 SHA512 SSDEEP

          vbc.exe

          • Path C:\Users\Public\vbc.exe
          • Size 1003KB
          • SHA256 120de63b8f726ad218289a7562f96160b9a01b5cc62bf98761628b1667502bfa
          • MD5 SHA1 SHA512 SSDEEP

          vbc.exe

          • Path \Users\Public\vbc.exe
          • Size 1003KB
          • SHA256 120de63b8f726ad218289a7562f96160b9a01b5cc62bf98761628b1667502bfa
          • MD5 SHA1 SHA512 SSDEEP

          memory/924-160-0x0000000002450000-0x0000000002490000-memory.dmp

          memory/924-159-0x0000000002450000-0x0000000002490000-memory.dmp

          memory/924-158-0x0000000002450000-0x0000000002490000-memory.dmp

          memory/1592-143-0x0000000000360000-0x0000000000376000-memory.dmp

          memory/1592-150-0x0000000000500000-0x0000000000540000-memory.dmp

          memory/1592-151-0x00000000003D0000-0x00000000003DC000-memory.dmp

          memory/1592-152-0x0000000005F80000-0x000000000602A000-memory.dmp

          memory/1592-142-0x0000000000500000-0x0000000000540000-memory.dmp

          memory/1592-141-0x0000000000840000-0x0000000000942000-memory.dmp

          memory/2012-54-0x000000005FFF0000-0x0000000060000000-memory.dmp

          memory/2012-187-0x000000005FFF0000-0x0000000060000000-memory.dmp