Office (OOXML) / .XLSX malware analysis — malicious · dea9186680f1be2a

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 5a17e06784b7efede7ed049a26459171 SHA-1: a54207294a55cedbfea29c179f34502b19333e01 SHA-256: dea9186680f1be2a7f80650985dc51bcf8a74fb6921d80b25c2cd631f9722832

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The sample is an Excel file containing Excel 4.0 macros. This type of macro is frequently used as a delivery mechanism for malware, often to download and execute a second-stage payload. 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` `dfd91d0737eaff9733917de0b9cdd3be68ae5a934482e830bbb6817fd364d607`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	4537 bytes

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