Office (OOXML) / .XLSX malware analysis — malicious · 994d30653dca14a8

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 1657c2635f1797142192d2a94061326a SHA-1: 43f3b96e776dffacd061962f851431b239679fdc SHA-256: 994d30653dca14a81ca53fa2d60777637339e63322566b1f1ba57b4a4e393fb5

60 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic

The critical heuristic firing indicates the presence of Excel 4.0 macros. The extracted macro content reveals a path that is likely used to stage or execute a malicious payload. The macro appears to be designed to download and execute a second-stage payload from the specified path.

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` `939dd71f6aaa6a6ceebf1e00b312176457eb905fd0d1e4ffbd3d0217fee45722`	xlm-macrosheet	OOXML XLM macro sheet: xl/macrosheets/sheet1.bin	3806 bytes

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