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

Static analysis result for SHA-256 8bd1a30f57b31999…

MALICIOUS

Office (OOXML) / .DOCX

123.8 KB Created: 2020-01-24 17:55:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 78b024214286f57932466039c56006b1 SHA-1: 4c096108d2d65d6428a162a00af05bf1edec345d SHA-256: 8bd1a30f57b31999bbef71643e003596aeaaf73e4719459b6c882fe778651ae8
220 Risk Score

Malware Insights

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

The OOXML document contains VBA macros, specifically a Document_Open macro, which is a common technique for executing malicious code automatically when the document is opened. The presence of ClamAV detections for 'Doc.Malware.Generic-7561114-0' on both the main file and an extracted artifact strongly indicates malicious intent. The GetObject call heuristic further suggests the macro is attempting to load and execute external code. The overall pattern points to a macro-based malware delivery mechanism.

Heuristics 6

  • 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 project inside OOXML medium OOXML_VBA
    Document contains vbaProject.bin — 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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