Office (OOXML) / .XLSX malware analysis — malicious · 47881cd7b0bb1290

MALICIOUS

Office (OOXML) / .XLSX

69.0 KB Created: 2021-03-15 18:20:11 UTC Authoring application: Microsoft Excel 16.0300

MD5: 2d99aefd764c9bf0ba1e5eb1ed657958 SHA-1: 2185c1f9546b67532ac795ef47fa5207efa0634b SHA-256: 47881cd7b0bb12903d07fafb98f917e24aa4520ea257e519aee31fe914cf4d20

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is identified as an Excel 4.0 macro sheet, a known technique for executing malicious code. The macro sheet contains obfuscated commands that are indicative of a downloader or initial execution stage. While the exact payload and destination are not clearly discernible due to truncation and obfuscation, the presence of Excel 4.0 macros strongly suggests an intent to execute arbitrary commands for further compromise.

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.

Filename	Kind	Source	Size
`xlm_sheet_00.bin` `3b30b847ecb3aee3c97475515d4b1ac5ef6cb473175a1f0b3906a981ea7cf456`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	96434 bytes

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