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

Static analysis result for SHA-256 7d5df9e67334ad06…

MALICIOUS

Office (OOXML) / .XLSX

120.5 KB Created: 2021-08-16 09:36:27 UTC Authoring application: Microsoft Excel 12.0000
MD5: 004d31674eab4fda1f8d70c825816054 SHA-1: 72d950592e13cbf2ad6ce3294b5d858da3a56533 SHA-256: 7d5df9e67334ad0661d6471f1183adc083b9809c242641f1227634f583a1d95a
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 additional malicious content. No specific URLs or commands were extracted, limiting the ability to identify a precise family or further 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
707851a35e22abcaabb5c9b79c61c371b4c01e544268b0ce30bc8792ec93fa36		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 224825 bytes

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