Office (OOXML) / .XLSX malware analysis — malicious · e4683f11c3451a78

MALICIOUS

Office (OOXML) / .XLSX

79.0 KB Created: 2021-03-14 19:50:37 UTC Authoring application: Microsoft Excel 16.0300

MD5: 33ac1564ba11c697dced406e7f11a26e SHA-1: e942a64b0d1f8bd6744a31e5a7075a1efe2a0f7c SHA-256: e4683f11c3451a78961282b2cd2174fc0f2c2e0669ffadc4f2ceba8adca0e246

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The critical heuristic firing indicates the presence of Excel 4.0 macros within an XLSX file. While the macro content is truncated and heavily obfuscated, the presence of such macros is a strong indicator of malicious intent, typically used to download and execute further stages of an attack. The file is identified as malicious with a risk score of 60.

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` `b2408d0b6c593d5edd3aaf5ea23f0796ace10bfc1a0a7658009a14a543f61ffe`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	97004 bytes

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