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

Static analysis result for SHA-256 7a257b44a9fb62af…

MALICIOUS

Office (OOXML) / .DOCX

123.8 KB Created: 2020-01-24 17:55:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 634e61a9ee449281006ebc1c0ee9facb SHA-1: b4694f1091c22c70be1513e71e8397f5ba01c228 SHA-256: 7a257b44a9fb62afa665bf698344474aa5ad6ab256a2ba1692223bb491dd938e
262 Risk Score

Malware Insights

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

The sample is a malicious OOXML document containing a VBA project with a Document_Open macro. This macro is designed to execute obfuscated VBA code, as indicated by the GetObject call and p-code auto-execution firings. The presence of the 'macros.bas' and 'vbaProject_00.bin' artifacts further confirms the macro-based nature of this threat. The primary function of the VBA code appears to be downloading and executing a secondary payload, a common technique for initial access via spearphishing attachments.

Heuristics 7

  • ClamAV: Doc.Malware.Generic-7561114-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Malware.Generic-7561114-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • 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
    • http://schemas.microsoft.com/office/drawing/2014/chartex
    • http://schemas.microsoft.com/office/drawing/2015/9/8/chartex
    • http://schemas.microsoft.com/office/drawing/2015/10/21/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/9/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/10/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/11/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/12/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/13/chartex
    • http://schemas.microsoft.com/office/drawing/2016/5/14/chartex
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/drawing/2016/ink
    • http://schemas.microsoft.com/office/drawing/2017/model3d
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/officeDocument/2006/math
    • http://schemas.microsoft.com/office/word/2010/wordprocessingDrawing
    • http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing
    • http://schemas.openxmlformats.org/wordprocessingml/2006/main
    • http://schemas.microsoft.com/office/word/2010/wordml
    • http://schemas.microsoft.com/office/word/2012/wordml
    • http://schemas.microsoft.com/office/word/2018/wordml/cex
    • http://schemas.microsoft.com/office/word/2016/wordml/cid
    • http://schemas.microsoft.com/office/word/2018/wordml
    • http://schemas.microsoft.com/office/word/2015/wordml/symex
    • http://schemas.microsoft.com/office/word/2010/wordprocessingGroup
    • http://schemas.microsoft.com/office/word/2010/wordprocessingInk
    • http://schemas.microsoft.com/office/word/2006/wordml
    • http://schemas.microsoft.com/office/word/2010/wordprocessingShape

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
2e69eaa04feffbb73e98259741bf4755e343bdf74147fd3a247cee8f53495784		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 13241 bytes
vbaProject_00.bin
106eae77aeacfe4074a08429ba8085d0c13fd08596c1596e54ec6b8689605d33		 vba-project OOXML VBA project: word/vbaProject.bin 114176 bytes
Detection
ClamAV: Doc.Malware.Generic-7561114-0
Obfuscation or payload: unlikely

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