Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 ab683c086389f293…

MALICIOUS

Office (OOXML)

60.0 KB Created: 2021-07-09 16:09:00 UTC Authoring application: Microsoft Office Word 16.0000
MD5: 5bf2aea41a83e5786162dced99e5d20c SHA-1: 5b30ad74ee8e98e589da2483908038e147102f64 SHA-256: ab683c086389f2934d37ddf36c2d6413654cbde1fd133f54682ac8c99c75bd35
110 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample contains VBA macros that execute when a button is clicked. The macro uses CreateObject to launch a browser to a survey URL, then attempts to download and save a file named 'update.exe' to the user's Pictures directory. It then attempts to execute this downloaded file, likely a second-stage payload.

Heuristics 5

  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • External relationship high OOXML_EXTERNAL_REL
    External target in word/_rels/settings.xml.rels: file:///C:\Users\me\AppData\Local\Microsoft\Office\16.0\DTS\en-US{9FB8F101-A9BB-4AB8-9D15-7AAE6F9A83A7}\{7794525E-85C6-4
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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 https://survey.edigitaldocument.com/survey/2810480197.html
    • 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
ea826c262fd48f96f1f953fbf217f73d645e8db3f77b3037782dec3b17329797		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1010 bytes
vbaProject_00.bin
b7d426a76cc9eef1052383995b44da152d9719dcc4b18dafded7c252624874e6		 vba-project OOXML VBA project: word/vbaProject.bin 10752 bytes

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