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

Static analysis result for SHA-256 96e08603df95e9e4…

MALICIOUS

Office (OOXML) / .XLSX

3.37 MB Created: 2021-04-18 22:18:27 UTC Authoring application: Microsoft Excel 16.0300
MD5: 6802a732fa84893f4d4374357865808a SHA-1: cc36626d3d8a88bcdcce5e2b71e6eba65371aea7 SHA-256: 96e08603df95e9e47877cc3ff2c3a02c68579acc8ebc703f726032a9b786a7f4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell

This XLSX file contains VBA macros, including a Workbook_Open macro, which is a common technique for executing malicious code upon opening. The presence of a Shell() call and a CreateObject call strongly suggests that the macro is designed to download and execute a secondary payload. No specific family could be identified, and no external IOCs like URLs or hashes were extracted.

Heuristics 5

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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.openxmlformats.org/spreadsheetml/2006/main
    • http://schemas.openxmlformats.org/officeDocument/2006/relationships
    • http://schemas.openxmlformats.org/markup-compatibility/2006
    • http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac
    • http://schemas.microsoft.com/office/spreadsheetml/2014/revision
    • http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
    • http://schemas.microsoft.com/office/spreadsheetml/2016/revision3

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
aa9a3cd7968345e1b7166e47ca4f970065412cb6fa5d02f4f3a256888c768a76		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 8388608 bytes
vbaProject_00.bin
679f435569e276eb32e3b8f78106750ddfca17fa1422d3848c9a0965a9d71ad8		 vba-project OOXML VBA project: xl/vbaProject.bin 3785728 bytes

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