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

Static analysis result for SHA-256 6fdfc3e5c1c04fae…

MALICIOUS

Office (OOXML) / .XLSX

81.3 KB Created: 2021-02-26 07:53:41 UTC Authoring application: Microsoft Excel 16.0300
MD5: d7685e93288b06ca90d75290f639264b SHA-1: a6cd1eb8be701c257731c8e951e7d3e31f7f6ff1 SHA-256: 6fdfc3e5c1c04faec9f771b1ed595de0487368e394c0b62c6ede03695f73c322
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file contains Excel 4.0 macros, indicated by the OOXML_XLM_MACROSHEET heuristic. These macros are likely used to execute arbitrary commands, a common technique for initial execution or payload delivery. The specific commands within the macro are truncated, preventing a more detailed analysis of the execution flow or IOCs.

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
6cfaedc786ca72f5520cdb5436fe09d2d67047eda4aa8c2ea02be423b7d42a37		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 4569 bytes

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