Office (OOXML) / .XLSX malware analysis — malicious · 810b669d19151df1

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: d2a8d53a7f4ff5f2a8fecf44dbb8c92e SHA-1: f2427e6b2efae30133fc2e2225aca7446ccf4cb7 SHA-256: 810b669d19151df1461804da5057fe57f355369adf5770b0b5022ee82317dc54

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel document containing Excel 4.0 macros, indicated by the OOXML_XLM_MACROSHEET heuristic. These macros are typically used to execute arbitrary code or download additional payloads. No specific URLs or further script details were extracted due to truncation, limiting the ability to identify a specific family or more detailed 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` `9ec52668d4baad371f6d63f843a8720ed16017506ad84c3db8d5f32c8622dcd1`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	221749 bytes

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