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

Static analysis result for SHA-256 cbec2b40fb13c8f7…

MALICIOUS

Office (OOXML) / .XLSX

59.1 KB Created: 2021-03-15 18:26:22 UTC Authoring application: Microsoft Excel 16.0300
MD5: 7cdbd3ca25037a12c6ec3f38dfc4833e SHA-1: 92dcb3f314aabfcd234965d7b1244850e4a2c90a SHA-256: cbec2b40fb13c8f78b0e87af9e691f0227a853617d3b816539e2bf28c6b25425
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is an Excel 4.0 macro sheet, identified by the OOXML_XLM_MACROSHEET heuristic. The embedded macro content is heavily obfuscated and truncated, preventing a detailed analysis of its specific actions. However, the presence of Excel 4.0 macros strongly suggests an intent to execute arbitrary commands, typically for downloading and executing further malicious content.

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
4e3c8883b95c67e9968a1613e737b4582eb0131060db15f7211c005707dbf2c2		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 93382 bytes

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