Office (OOXML) / .XLSX malware analysis — malicious · 1e494dab0d671280

MALICIOUS

Office (OOXML) / .XLSX

118.3 KB Created: 2021-03-29 19:55:34 UTC Authoring application: Microsoft Excel 16.0300

MD5: ad876de8e881e5230af0aa0d6047ae18 SHA-1: 3b871930c51ef069bc7044c8cd1c33121eb98e3c SHA-256: 1e494dab0d671280c4322fa47130e4805d0b456759f83dd83ac62d82ae8a2766

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The sample is an Excel file containing Excel 4.0 macros. The heuristic firing indicates the presence of these macros, which are often used to download and execute malicious payloads. The macro content is heavily truncated and obfuscated, 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` `db89bcd8a5b69dd53f68c32166ee9e81b4cce3291d1a4b3a29798bad31087433`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	95545 bytes

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