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

Static analysis result for SHA-256 8f2d47f912f0b8cb…

MALICIOUS

Office (OLE) / .XLSX

330.5 KB Created: 2020-07-02 12:55:44 Authoring application: Microsoft Excel
MD5: f4b5bbd8c8da1e66e8eeb608d56b9ae1 SHA-1: 23272fad85ee5046769fb55a9243732940c647e4 SHA-256: 8f2d47f912f0b8cb934caa8d53a2b8187f48f9abb0ef3831ed88882190adc92b
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The OLE_XLM_AUTOOPEN heuristic further confirms the presence of an auto-executable macro. The document body is heavily obfuscated and truncated, preventing a detailed analysis of its specific payload or intent. However, the presence of encrypted XLM macros strongly suggests an attempt to execute arbitrary code upon opening.

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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