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

Static analysis result for SHA-256 7490a619c30ae5f7…

MALICIOUS

Office (OOXML) / .XLSX

197.2 KB Created: 2021-02-27 09:36:14 UTC Authoring application: Microsoft Excel 16.0300
MD5: a6a40537db53133306787b250d57d86b SHA-1: 0d17d3b2bd1ed8bedceb416680f6c92f9dae9966 SHA-256: 7490a619c30ae5f723575413f3993cc5bf8863ae706e3d504358518a16e6e19d
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The critical heuristic firing indicates the presence of Excel 4.0 macros within the XLSX file. These macros are often used to download and execute malicious payloads, making them a significant threat. The truncated script content prevents a more detailed analysis of the specific actions taken.

Heuristics 1

  • Excel 4.0 macro sheet (1 sheet(s)) critical OOXML_XLM_MACROSHEET
    Spreadsheet contains an Excel 4.0 (XLM) macro sheet — XLM was a major Office malware vector during 2020-2022 and evaded many VBA-focused controls before Microsoft tightened XLM defaults. Even legitimate XLM use is rare in modern workbooks. The macro sheet is stored as XLSB/BIFF12 binary content, which many XML-only OOXML scanners miss.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_sheet_00.bin
fee0c19b0601dec029932940251ffd3f32418b682af34762bb6ab5c31394b287		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 8324 bytes
Preview script
First 1,000 lines of the extracted script
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... (truncated)

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