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

Static analysis result for SHA-256 0c4068936697d08b…

MALICIOUS

Office (OOXML) / .XLSX

105.0 KB Created: 2021-03-29 19:54:15 UTC Authoring application: Microsoft Excel 16.0300
MD5: a65cdaeee33258135e1a6f4721d3c597 SHA-1: 9f5f8aa3f1638505341bdc24f3c189ad1343cfbc SHA-256: 0c4068936697d08bcfab6ef4ed9ea7f73900170073f99a9ef5f173da3bc1a42a
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The critical heuristic firing indicates the presence of Excel 4.0 macros within the XLSX file. These macros are capable of executing arbitrary commands, which is a common technique for downloading and executing further malicious stages. The truncated script content prevents a more detailed analysis of the specific commands being executed.

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
d949a8b7ffa97589188bab8170d521758076d1b4c068e080055a6adbc7dea520		 xlm-macrosheet OOXML XLM macro sheet: xl/macrosheets/sheet1.bin 98782 bytes

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