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

Static analysis result for SHA-256 96b15f583fb37ed2…

MALICIOUS

Office (OOXML) / .XLSX

203.0 KB Created: 2021-03-16 13:14:06 UTC Authoring application: Microsoft Excel 16.0300
MD5: 5187bb10c4c811eacccbac886973c774 SHA-1: 463a9466922667b97da0f62e3998cf7ec8a5e5c1 SHA-256: 96b15f583fb37ed282ab93ef6e1ee80f0e0d309bc93edfd7c85a87f533fc4af3
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications

The critical heuristic firing indicates the presence of Excel 4.0 macros. The extracted macro content reveals commands to download a DLL from 'http://goda.r.xyz/camp/g/g4f.dll' and then execute it. This suggests the file acts as a downloader for a second-stage malicious payload.

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
6d374f43da678490b1522b1499d9410e80fc370f3e41527da748183880e5e3b8		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 2556 bytes

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