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

Static analysis result for SHA-256 a4585555f38c2b67…

MALICIOUS

Office (OOXML) / .DOCX

123.0 KB Created: 2020-01-30 22:17:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 29cfa4620620f5b97afd6fc9cae5eb76 SHA-1: 23dab03117bb82f5011f3ff68be9a23e5b731fda SHA-256: a4585555f38c2b6710b0e1a304a09263bf411ffc561b70a8f5e77597e1c1ade9
220 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The file is a malicious OOXML document containing VBA macros, specifically a Document_Open macro that utilizes GetObject. ClamAV signatures identify it as 'Doc.Downloader.Chartres-7571094-0', indicating its function as a downloader. The presence of the Document_Open macro and the downloader signature strongly suggests the document's purpose is to fetch and execute a secondary malicious payload.

Heuristics 6

  • ClamAV: Doc.Downloader.Chartres-7571094-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.Chartres-7571094-0
  • 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
f6b5ce3596a3def546a724b075d51071475f548662b15e8536154f403fc060a7		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 5454 bytes
vbaProject_00.bin
54c9054099de1624ee68ee0fab94b4e8a420e2170c7fc41f35a59aeb5070d2df		 vba-project OOXML VBA project: word/vbaProject.bin 42496 bytes
Detection
ClamAV: Doc.Downloader.Chartres-7571094-0
Obfuscation or payload: unlikely

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