Office (OOXML) / .XLSX malware analysis — malicious · eaf4092fa892c99b

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: e09ca36873a6f19d826d45037fda793b SHA-1: 2f6775b6447a17aa56eabf47617f1934d524fa3a SHA-256: eaf4092fa892c99b4c3f3a843324bd297db4fac6c5a1b775f9a409505b13bfa3

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. While the macro content is truncated, the presence of Excel 4.0 macros strongly suggests an attempt to execute arbitrary commands upon opening the document. Further analysis of the full macro content would be required to determine the specific payload or command execution.

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` `986380f15e19d4312e5d2bec8d9f6fc6022f370a51436f2dc2a85a7b59b7644b`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	253714 bytes

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