Office (OOXML) / .XLSX malware analysis — malicious · b40576b58877a5fd

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: c228cd46ae66842b76254ecbd792a13a SHA-1: 692db936f8c7cbd7af30427aef3ec12fdede21c7 SHA-256: b40576b58877a5fd59bbe9d7e6ba66a296631ff13a9d9d5f0ff88ad374beb604

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The sample is an Excel file identified as containing Excel 4.0 macros. These macros are known to be used for malicious purposes, such as executing arbitrary commands or downloading further payloads. The specific content of the macros was truncated, preventing a more detailed analysis of their exact function or any associated 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` `30e751136ea57c5cad0850bda7c7036bd3336d585cba9dddf41f815099aaac3c`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	7108 bytes

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