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

Static analysis result for SHA-256 6cdede4798ee4fdf…

MALICIOUS

Office (OOXML) / .XLSX

77.9 KB Created: 2021-03-15 18:25:26 UTC Authoring application: Microsoft Excel 16.0300
MD5: cbc4f6ee4388e7d36dfae1b4f96204d8 SHA-1: a0466665977023268b56686023b27bd737fce457 SHA-256: 6cdede4798ee4fdf130faebafff357482411de8dd51b83b3aa5faaba4a019b2e
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The file is an Excel spreadsheet containing Excel 4.0 macros, indicated by the OOXML_XLM_MACROSHEET heuristic. These macros are likely intended to download and execute a secondary payload, a common technique for initial compromise. The specific commands within the macro are truncated, preventing a more detailed analysis of the payload 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
7053dfd6c45cea5d0c065488e122ee33d12af57740719ab73c26c8ef55ec4aa1		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 97804 bytes

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