Office (OOXML) / .XLSX malware analysis — malicious · 568c9641ec9a32ae

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: be816f75d4a32f1288893ebb8038c72c SHA-1: 40fcd8ed5a2e1e971b975b728768b241e17b63fb SHA-256: 568c9641ec9a32aefdd46ecde982f3f2b5a136ea02b43d355478d4622a9f8329

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The sample is an Excel file containing a macro sheet, identified by the OOXML_XLM_MACROSHEET heuristic. While the macro content is heavily obfuscated and truncated, the presence of Excel 4.0 macros strongly suggests an intent to execute arbitrary commands, likely for malicious purposes such as downloading and running a second-stage payload. The specific commands or URLs are not discernible from the provided script excerpt.

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` `2d82cc98c460b2832560648c56f111c881f72aabe8f52cff92dc07e486ef1bfc`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	318184 bytes

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