Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 66e5ba41c63d4eb0…

MALICIOUS

Office (OOXML) / .XLSX

95.9 KB Created: 2020-03-19 15:06:18 UTC Authoring application: Microsoft Excel 16.0300
MD5: 1366e619fb34b1734da013191d7d6ca8 SHA-1: 67f473f2b124b6a233c1af64df75bb785783ff9a SHA-256: 66e5ba41c63d4eb06dfb578fb24107fa2ef2cfc24e11945398076aee17d36479
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The critical heuristic firing indicates the presence of Excel 4.0 macros within the XLSX file. These macros are likely designed to download and execute a second-stage payload, a common technique for initial execution and payload delivery. The truncated script content prevents a more detailed analysis of the specific actions taken.

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.

FilenameKindSourceSize
xlm_sheet_00.bin
567428a85f797c97cc01b81520ec98ab2b28311754e4f49eeb425ea0feb6bbbb		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 22875 bytes

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