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

Static analysis result for SHA-256 e3e8734b6c469b65…

MALICIOUS

Office (OOXML) / .XLSX

112.0 KB Created: 2021-03-29 19:54:15 UTC Authoring application: Microsoft Excel 16.0300
MD5: 0ff4cffa09e185597bb7868fe9074832 SHA-1: 6264bd34535aa6b0e82da90b01af470273b87105 SHA-256: e3e8734b6c469b65527eae4d41f69c97dd670d2711cfbdf3cb12e82dc9cc81f8
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel file containing a single Excel 4.0 macro sheet. The heuristic firing indicates the presence of these macros, which are often used to download and execute malicious payloads. The macro content is heavily truncated and obfuscated, preventing a more detailed analysis of its specific actions 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
d949a8b7ffa97589188bab8170d521758076d1b4c068e080055a6adbc7dea520		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 98782 bytes

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