Office (OOXML) / .XLSX malware analysis — malicious · 7dcc207eae96034d

MALICIOUS

Office (OOXML) / .XLSX

113.6 KB Created: 2021-08-16 09:36:27 UTC Authoring application: Microsoft Excel 12.0000

MD5: e990ec2f2292a20fa7431377236bd3e2 SHA-1: 10f9c06cc4a3e65c93845bf3492b956b5766283c SHA-256: 7dcc207eae96034d432e889458531b38fe3c4220850945014ef0d65a7cb2a3d9

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The sample is an Excel file containing Excel 4.0 macros, indicated by the OOXML_XLM_MACROSHEET heuristic. Excel 4.0 macros are a legacy feature that can be abused for malicious purposes, typically to download and execute further stages of malware. No specific IOCs were extracted from the macro content due to its truncated nature.

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` `f1247ffcc1baebb9e88cf7504951e8cf7b06ad0cb4a409bd660d7689a8f6bc6e`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	350744 bytes

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