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

Static analysis result for SHA-256 9a23e402165aacfb…

MALICIOUS

Office (OOXML) / .XLSX

124.0 KB Created: 2021-03-22 09:18:04 UTC Authoring application: Microsoft Excel 16.0300
MD5: 6868be2e748a8d86a880a5268c9c9dc5 SHA-1: b36fb2d3bd736e98eeb7b3b08cf84612301bb575 SHA-256: 9a23e402165aacfbcce237884abebd2ac2bd2373d0ff5289df4095feae667b67
60 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 macros. The macros appear to be designed to download a file from 'http://ballparrop.xyz/program/data/f/lots/h/4g/f.dll' and execute it. The macros also attempt to open a URL, likely for further stages of the attack. The specific family is not identifiable from the provided evidence.

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
4ab31c7b56009e0daf5fdd1d96d7bc765fff915afc7879b5c32ea91f7113c006		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 2612 bytes

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