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

Static analysis result for SHA-256 561dcdf3a6586031…

MALICIOUS

Office (OOXML) / .XLSX

117.7 KB Created: 2021-03-29 19:54:15 UTC Authoring application: Microsoft Excel 16.0300
MD5: 1202475c36846f47de00c0e6642bd7b9 SHA-1: b6058b81cd9ae5a98cf78c797aff5a9f7ce7f066 SHA-256: 561dcdf3a6586031e1e00f0276fca6bf33f01f09603589c25f9bb205e26dc62d
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel file containing Excel 4.0 macros, indicated by the OOXML_XLM_MACROSHEET heuristic. The macro sheet itself is heavily obfuscated and truncated, preventing a detailed analysis of its specific actions. However, the presence of Excel 4.0 macros strongly suggests an intent to execute arbitrary commands or download further payloads.

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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