Office (OOXML) / .XLSX malware analysis — malicious · 4449394fb44d3169

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 61f534da1002124f4352bde4e786fec3 SHA-1: da668a643616d9e283520b7f6604d011a0a2e8dd SHA-256: 4449394fb44d3169450f8041fe0d5eaf202f6b743124d7f52327773e02c65541

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel spreadsheet containing Excel 4.0 macros, as indicated by the OOXML_XLM_MACROSHEET heuristic. These macros are known to be capable of executing arbitrary commands, which is a common technique for downloading and executing further stages of malware. The script content is heavily truncated and obfuscated, preventing a more detailed analysis of its specific actions or payload.

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` `aa83d6e07e5bab98528db4f50bd39b87a35adabd175134a49f7736871001c7e7`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	7839 bytes

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