Office (OOXML) / .XLSX malware analysis — malicious · 068eb2b690144b1a

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 7616efd9d10fd2c8d2b9f313410dc8e1 SHA-1: 9211184df686b4f870d1e615c98a1e0629273b3f SHA-256: 068eb2b690144b1a9aef6a1f93c41d1b7c7f804d172124199e20952fe0b6d5be

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel spreadsheet containing Excel 4.0 macros, indicated by the OOXML_XLM_MACROSHEET heuristic. These macros are capable of executing arbitrary commands, which is a common technique for downloading and executing further malicious content. The specific commands within the macro are heavily obfuscated and truncated, preventing a more detailed analysis of the payload or specific IOCs.

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` `7e80b4d767df7c79d414f6be278cb2470e6edf351a305884c8790652ed15d5da`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	717426 bytes

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