Office (OOXML) / .XLSX malware analysis — malicious · 2c18dc7deccc56fb

MALICIOUS

Office (OOXML) / .XLSX

201.5 KB Created: 2021-04-01 09:50:24 UTC Authoring application: Microsoft Excel 16.0300

MD5: 90a83cae8829e3afa721ace727c20234 SHA-1: 060c4cf70bd573f0239e44dce45015be240cdfd3 SHA-256: 2c18dc7deccc56fbc7992651102cf8d40d665df570f5d36acc5deb9b53d69083

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The sample is an Excel file containing Excel 4.0 macros, as indicated by the OOXML_XLM_MACROSHEET heuristic. These macros are designed to execute upon enabling content, likely to download and execute a second-stage payload. The specific macro sheet is named 'xlm_sheet_00.bin'.

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` `26ac1a0abae2f44d706d27fb1430c6736e58535406a9d5220c824ae52aade457`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	1877 bytes

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