Office (OOXML) / .XLSX malware analysis — malicious · d2ebc46ddc391d82

MALICIOUS

Office (OOXML) / .XLSX

86.3 KB Created: 2021-10-27 10:31:49 UTC Authoring application: Microsoft Excel 12.0000

MD5: a24a6fe26eeca112cc1b39a1cb710d8b SHA-1: 5216e55a1ba1238d8ec394cf65ba567509ab872b SHA-256: d2ebc46ddc391d821fdec1b108fa63fbb02130c9965fd03059842af503822c9f

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The critical heuristic firing indicates the presence of Excel 4.0 macros. The extracted macro content, though partially truncated and obfuscated, contains a path that appears to be an attempt to create a directory and potentially execute a file from it. This suggests the macro's purpose is to download and execute a second-stage payload.

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` `088ee832d1aa271255831929188f96e7214c48fd6e16b9db2060a425b7722eca`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	4010 bytes

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