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

Static analysis result for SHA-256 87149ad8f58e7219…

MALICIOUS

Office (OOXML) / .XLSX

78.0 KB Created: 2021-03-14 21:05:29 UTC Authoring application: Microsoft Excel 16.0300
MD5: 064820f6358fd33f8f14e43045e7c735 SHA-1: 9b55b26fa67d72b0e5fa525d10620bed8fd72c61 SHA-256: 87149ad8f58e72191cfb287c0a130b1b0d2b0066396e639037798e278b0a9a1b
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel file containing an Excel 4.0 macro sheet. This type of macro is frequently used as a loader for malicious payloads, often by downloading and executing further stages from a remote source. The macro content itself is heavily obfuscated and truncated, preventing a more detailed analysis of its specific actions or the reconstruction of any URLs or commands.

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
960c394d736bd28a22cdbaefb32ed1c1df482799f5906b8e65d589d8b807b712		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 88880 bytes

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