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

Static analysis result for SHA-256 da96c43577d4c6dd…

MALICIOUS

Office (OOXML) / .XLSX

105.2 KB Authoring application: Microsoft Excel 16.0300
MD5: 2f4b63ce5a78234293deff87179516b1 SHA-1: dc8d9395109784fba1ab4d1a14191d55e79688e6 SHA-256: da96c43577d4c6dd19132027b975456d2f3dc2b7af49ba9257356ede96de78e6
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.002 Spearphishing Attachment

This XLSX file contains a Workbook_Open VBA macro, a common technique for executing malicious code automatically when the document is opened. The presence of 'CreateObject' and 'macros.bas' suggests the macro is designed to download and execute a second-stage payload. While no specific URLs or executable files were directly extracted, the heuristic firings strongly indicate a macro-based downloader. The benign URLs present are standard XML namespace declarations and do not indicate malicious activity.

Heuristics 5

  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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
61e5641500a032549cbce83191f841842d78d6cc2733adc5f40c73ba017059eb		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 3558 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
vbaProject_00.bin
bc3849bf049a1992e4b9f6033fb3020486f942da6350162694d4c4b20007c24d		 vba-project OOXML VBA project: xl/vbaProject.bin 5632 bytes

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