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

Static analysis result for SHA-256 eadcd3dc65845d65…

MALICIOUS

Office (OOXML) / .XLSX

111.2 KB Created: 2021-03-29 19:54:15 UTC Authoring application: Microsoft Excel 16.0300
MD5: 425f900a862e2eefedeef6eb01891b3c SHA-1: 31635d2fa9212080542aacf280e8fc18088ba2fc SHA-256: eadcd3dc65845d65bd6c20928d4ad83239c178bce024d256ef9edf87da7af422
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel file containing a macro sheet, indicated by the OOXML_XLM_MACROSHEET heuristic. The extracted macro content is heavily truncated but suggests the execution of commands. Without further deobfuscation or content, the specific payload and delivery mechanism remain unclear, leading to an unknown family attribution and moderate confidence.

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
d949a8b7ffa97589188bab8170d521758076d1b4c068e080055a6adbc7dea520		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 98782 bytes

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