Office (OOXML) / .XLSX malware analysis — malicious · 17166dbf4f4d830b

MALICIOUS

Office (OOXML) / .XLSX

109.7 KB Created: 2021-08-16 09:36:27 UTC Authoring application: Microsoft Excel 12.0000

MD5: 93a478f4d10d33926b53a4d8e339ec62 SHA-1: 8eac8e08a7dbc1ec4c416ffe6165d497065a9bb5 SHA-256: 17166dbf4f4d830b26bc57c1fd591a4b248df038ae67eae73de3ce21d96b9975

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel spreadsheet containing Excel 4.0 macros, identified by the OOXML_XLM_MACROSHEET heuristic. These macros are known to be used for executing arbitrary commands, often to download and execute further malicious content. The specific macro sheet 'xlm_sheet_00.bin' is the primary artifact of interest.

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` `fce1b2830bccde4eac9b5486293070b10630e2226be7a463d51bfeaf10e79bbd`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	293016 bytes

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