Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 d06e6296746fefb1…

MALICIOUS

Office (OOXML)

244.6 KB Created: 2021-02-07 17:10:00 UTC Authoring application: Microsoft Office Word 16.0000 First seen: 2021-09-17
MD5: a26558411df4e28e856264d6f1cce104 SHA-1: bc4a04b16276cf280fe747479dfd83e9694389f7 SHA-256: d06e6296746fefb18b5ad092eeb16e5a2ce061f6c6f26145f4ff806e66e843bc
122 Risk Score

Malware Insights

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

The file is an OOXML document containing VBA macros, as indicated by multiple heuristics. The 'OLE_VBA_PCODE_AUTOEXEC_EXEC' heuristic specifically points to an auto-executing VBA macro (AutoOpen) that uses 'CreateObject', a common technique for downloading and executing further stages. ClamAV detection further confirms its malicious nature. The presence of VBA macros and the AutoOpen execution method strongly suggest a downloader or droppper functionality.

Heuristics 4

  • ClamAV: Doc.Downloader.BlueWord12213-9918951-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.BlueWord12213-9918951-0
  • VBA project inside OOXML medium 1 related finding OOXML_VBA
    Document contains a VBA project — VBA macros present
  • 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.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) 619 bytes
SHA-256: 8dedc428de81eadbcb1a51e2fd8b6f913abc8a91cbf478c1efefea38b5812d21
Preview script
First 1,000 lines of the extracted script
Attribute VB_Name = "ThisDocument"
Attribute VB_Base = "0{D5BC09B9-F0EA-4930-86A1-8F3D07EC2FE8}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True

Attribute VB_Name = "InstrumentationUtil"
Attribute VB_Base = "0{D5BC09B9-F0EA-4930-86A1-8F3D07EC2FE8}"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = True
Attribute VB_TemplateDerived = False
Attribute VB_Customizable = True
vbaProject_00.bin vba-project OOXML VBA project: word/vbaProject.bin 96256 bytes
SHA-256: 60d40412894d2d23c424f7c905679335bc0142dd267abbb54d132a1519d4fa58

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