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

Static analysis result for SHA-256 2d95163ef2732027…

MALICIOUS

Office (OOXML) / .XLSX

203.0 KB Created: 2021-03-16 13:14:06 UTC Authoring application: Microsoft Excel 16.0300
MD5: 328069f858de002f5bfe248dbba0d96d SHA-1: 70f5fd7b163dae1d627a4278462cc7991d5f9b77 SHA-256: 2d95163ef2732027615c7c98438da5401e1892707a104d18d703698a17be0806
60 Risk Score

Malware Insights

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

The critical heuristic firing indicates an Excel 4.0 macro sheet, which is often used for malicious purposes. The embedded macro content, when partially reconstructed, reveals strings that suggest downloading and executing a file from the URL 'http://gogodark.xyz/cam/g/g/h4gf.dll'. This indicates a downloader or droppper functionality.

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
5527b28a0e3e81c54d4caac65a095d45378bdea9648d2c2842fd19a57703e6e4		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 2556 bytes

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