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

Static analysis result for SHA-256 81fcb3dce45b041a…

MALICIOUS

Office (OOXML) / .DOC

162.3 KB Created: 2021-12-05 21:31:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: d74f268b986fecfa03b81029dd134811 SHA-1: d49848ac2888e080883a427ef18b406fdcab6b9b SHA-256: 81fcb3dce45b041a91b0c0e01c27e032d7e8d26217d4b6d669ce258b491a830d
82 Risk Score

Malware Insights

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

The sample is a malicious OOXML document containing an embedded OLE object. This object, identified by the OFFICE_EMBEDDED_MACRO_OBJECT heuristic, carries a VBA macro project. The macro is designed to download a second-stage payload from the URL https://bitly.com/asdqwdwdsfvcxvccv. This indicates a typical macro-based malware delivery chain.

Heuristics 3

  • Embedded Office object carries macros critical OFFICE_EMBEDDED_MACRO_OBJECT
    This document embeds a second Office file that itself contains a VBA macro project or an Excel 4.0 (XLM) macro sheet. Hiding a macro-bearing workbook or document inside another document — frequently under an obfuscated, non-standard part name — is a macro-smuggling technique that defeats scanners which only inspect the outer document's macro storage. No benign authoring workflow stages a hidden macro project this way.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object
  • 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/2020/wordml/sdtdatahash
    • 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
    • https://bitly.com/asdqwdwdsfvcxvccv

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
63871ae61e43aab5c86d02a67f9a949b30e859f746c3f324eb14fa653c19a996		 ooxml-ole-object OOXML embedded OLE part: word/embeddings/ASJDHGAJSKLDJASKDHAJKSDHSAK.xlsm 12330 bytes
emf_00.emf
e7a7f5ffbdf647897cdaab172320c520d17e51031d8f14989e3fa79031348eb7		 ooxml-emf OOXML EMF part: word/media/image2.emf 1816 bytes

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