Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 ad73613ffc9a12a5…

MALICIOUS

Office (OLE) / .XLS

299.8 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: a6bf323a254ca1c16d055d83596172c2 SHA-1: 6d493bb5d7b5df781d54ce99902718c6c93aa3ff SHA-256: ad73613ffc9a12a59a72de4c66145d4c4f5e107556861e9a59704e76e8c10951
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, as indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The OLE_XLM_AUTOOPEN heuristic suggests that the macro is designed to run automatically when the spreadsheet is opened. The document body content is heavily obfuscated and truncated, preventing a detailed analysis of its specific payload or intent. However, the presence of encrypted macros strongly suggests malicious activity.

Heuristics 2

  • Encrypted Excel 4.0 macro sheet high OLE_XLM_ENCRYPTED_MACROSHEET
    Workbook contains an Excel 4.0 macro sheet and BIFF FILEPASS encryption. Password-protected XLM macro sheets, especially the default Excel password path, are a common malware evasion pattern because static formula extraction may fail until the workbook is decrypted.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

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