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

Static analysis result for SHA-256 e57c0bfb17d0f5f9…

MALICIOUS

Office (OOXML) / .DOCX

96.2 KB Created: 2018-11-08 11:42:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2026-06-25
MD5: d43ba33aa807388d2ba5040ee07983de SHA-1: b0ffd10ed874145b29dc49f69b03203f4f367a5a SHA-256: e57c0bfb17d0f5f9e5b4b9bd002c112e364a631ada7cde0bf72e397fec0ef84d
190 Risk Score

Malware Insights

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

The sample is a DOCX file containing a VBA macro with a Document_Open subroutine. This macro attempts to download and embed an image from the URL http://kanzlei-doersert.bzfsm.de/a2c569a0-8da2-40ba-b7a2-ffa37603d315 into the document. This behavior is indicative of a spearphishing attachment designed to lure users into opening a document that may then download additional malicious content or track the user.

Heuristics 8

  • Embedded Office document has suspicious static findings critical EMBEDDED_OFFICE_CHILD_STATIC_TRIAGE
    A CFB/OLE Office document was found inside another file type and its carved contents matched Office exploit or payload heuristics. This catches wrapped exploit documents where the top-level file routes to a PE, archive, or generic scanner instead of Office.
  • OLE document has large unaccounted-for region high OLE_SLACK_ANOMALY
    This finding applies to a carved embedded Office document found at a nonzero offset inside the submitted file, not directly to the top-level document. OLE file is 59,583 bytes but its declared streams total only 11,728 bytes — 47,855 bytes (80%) live in unallocated sector slack. This is the canonical hiding place for pre-macro-era Office exploit payloads (XOR-encoded shellcode reached via a parser pointer-corruption bug in the document structure).
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Remote image (web beacon / tracking pixel) medium OOXML_IMAGE_BEACON
    Document references an external image URL — loads automatically on open, revealing IP address and timestamp to the server (used for phishing tracking and NTLM hash theft on corporate networks)
  • External relationship medium OOXML_EXTERNAL_REL
    External target in word/_rels/document.xml.rels: http://kanzlei-doersert.bzfsm.de/a2c569a0-8da2-40ba-b7a2-ffa37603d315
  • VBA macros detected medium 1 related finding OLE_VBA_MACROS
    This finding applies to a carved embedded Office document found at a nonzero offset inside the submitted file, not directly to the top-level document. Document contains VBA macro code
  • Document_Open macro low OLE_VBA_DOCOPEN
    Document_Open macro
    Matched line in script
    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://kanzlei-doersert.bzfsm.de/c5968647-ca3d-40f8-970a-1d4aa9ff1d32 In document text (OOXML body / shared strings)
    • http://kanzlei-doersert.bzfsm.de/a2c569a0-8da2-40ba-b7a2-ffa37603d315OOXML external relationship
    • 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.microsoft.com/office/drawing/2015/10/21/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartexIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartexIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/markup-compatibility/2006In document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2016/inkIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/drawing/2017/model3dIn 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/2016/wordml/cidIn 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)
    • http://schemas.openxmlformats.org/package/2006/content-typesIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/package/2006/relationshipsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships/extended-propertiesIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/package/2006/relationships/metadata/core-propertiesIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocumentIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships/imageIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships/headerIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships/stylesIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships/endnotesIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships/footerIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships/customXmlIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships/themeIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/2006/relationships/vbaProjectIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships/footnotesIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships/webSettingsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships/fontTableIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships/settingsIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/mainIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/drawingml/2006/pictureIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/thememl/2012/mainIn document text (OOXML body / shared strings)
    • http://schemas.microsoft.com/office/2006/relationships/wordVbaDataIn document text (OOXML body / shared strings)
    • http://schemas.openxmlformats.org/schemaLibrary/2006/mainIn document text (OOXML body / shared strings)
    +11 more URL(s)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 682 bytes
SHA-256: ef26c98c357120d77435ef9ed27c5ea8f79a36ac9f30c9aa5e4bb9a5ac6d6660
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

Sub Document_Open()

    Dim imagePath As String
    imagePath = (Trim(Split(ActiveDocument.Sections(1).Headers(wdHeaderFooterPrimary).Range.Text, vbCr)(0)))

    ActiveDocument.Shapes.AddPicture FileName:=imagePath, _
    LinkToFile:=False, _
    SaveWithDocument:=True, _
    Left:=-71, _
    Top:=-71, _
    Anchor:=Selection.Range, _
    Width:=843, _
    Height:=596
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 15872 bytes
SHA-256: c3fb3487e030f915ee3a2046183e0907b0deeeeec9ddf0639d7f55473c9f5fc1
embedded_office_off00009814.ole embedded-office Embedded OLE/CFB Office body inside ooxml container at offset 0x9814 59583 bytes
SHA-256: 881719d436d59343a949571e4a57b5db1f60ae0af3667773865f1daf53fe6f66

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