Office (OOXML) / .XLSX malware analysis — malicious · 6d0d90262cc48b91

MALICIOUS

Office (OOXML) / .XLSX

100.4 KB Created: 2020-11-16 23:27:24 UTC Authoring application: Microsoft Excel 16.0300

MD5: 65b9f41b86d542df6a3f36248b9adc14 SHA-1: 5dcc990ad4c9aa3d23d3228a07ce741cf114639c SHA-256: 6d0d90262cc48b911332575c66475bca8a9b313c36f51c2a49fbc67bfe0e294c

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 designed to execute arbitrary commands, which is a common technique for delivering secondary payloads. The macro content is truncated, preventing a more detailed analysis of its specific actions or 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` `22d0dcf82adffd3cdf24165267d21cb29389bc4c0532a28921e7021092301b3b`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	95119 bytes

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