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

Static analysis result for SHA-256 1a50bb44cfa8b331…

MALICIOUS

Office (OOXML) / .DOC

42.4 KB Created: 2021-12-16 08:57:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 5205feb59d1a3ed1b5def9fd9f30e6d7 SHA-1: afbaab2ed231ab6cd1a4cedb326de92560a3b42f SHA-256: 1a50bb44cfa8b331586e8cfa8b8e85183f4b0e46cd04949859f82b75ef59f383
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample is a malicious OOXML document containing VBA macros. The `autoopen` subroutine saves the document with a name derived from the document's keywords (reversed) and then executes it using `GetObject`. This indicates a downloader or dropper functionality, aiming to execute a second-stage payload. The ClamAV detection name 'Doc.Downloader.BlueWord12210-9915312-0' further supports this assessment.

Heuristics 5

  • ClamAV: Doc.Downloader.BlueWord12210-9915312-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.BlueWord12210-9915312-0
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen 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.openxmlformats.org/markup-compatibility/2006
    • 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/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
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://ns.adobe.com/tiff/1.0/
    • http://ns.adobe.com/exif/1.0/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
aa5e2231c7d6da5ab0591fd7fbe5b3dccbd25924b96fba0cfbf54250d4287880		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 893 bytes
vbaProject_00.bin
a61136e579b04ee36cec31295ffd74c2743c4b3c7c9220c60b3605e771e583e5		 vba-project OOXML VBA project: word/vbaProject.bin 14336 bytes

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