Office (OOXML) / .XLSX malware analysis — malicious · 14ee8fe1b5df73da

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 48a10cd89790785f31ebcfc2e1c96ee3 SHA-1: bea251b714aefa43254dd9b252aeb04baf126041 SHA-256: 14ee8fe1b5df73dac77e228d5799595799cd07d9d0ed4ecb61247353d8241f72

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The file is an Excel spreadsheet containing Excel 4.0 macros, indicated by the OOXML_XLM_MACROSHEET heuristic. These macros are designed to execute arbitrary commands, a common technique for downloading and executing further malicious content. The specific commands within the macro are truncated, preventing a more detailed analysis of the payload or specific 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` `ad8fbb671f059d5b58635b0b83e9cb767913e4195473d729bbed0b55ce98628f`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	7197 bytes

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