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

Static analysis result for SHA-256 194e15af1470c308…

MALICIOUS

Office (OOXML) / .XLSX

123.2 KB Created: 2020-11-16 23:46:15 UTC Authoring application: Microsoft Excel 16.0300
MD5: 99b8adc822b675e556b21c2511a02c46 SHA-1: 319d489df36afa7ada2d229cac87bc65134ba0a4 SHA-256: 194e15af1470c308654bca75c06da143285adde7eea6e18db775756953e6ad7a
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is an Excel spreadsheet containing Excel 4.0 macros, indicated by the OOXML_XLM_MACROSHEET heuristic. These macros are designed to execute arbitrary code, likely to download and run a second-stage payload. The specific commands within the macro sheet are heavily obfuscated and 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
09419c3bcc0c41302a813bfb30c17f1b407076837f5cd577865837fd3950a00e		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 97009 bytes

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