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

Static analysis result for SHA-256 ab245cbfc433ac59…

MALICIOUS

Office (OLE) / .XLS

195.0 KB Created: 2020-11-09 01:17:34 Authoring application: Microsoft Excel
MD5: f8412bef48b2738a55a72a42e49faef8 SHA-1: 475a93184e8076d14a8ee2bc823f8b5c49ae2862 SHA-256: ab245cbfc433ac599cb18a4a4d866d5c39c2da52cafa9389936729b1d23cd4e6
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 presence of an AUTOOPEN macro suggests it is designed to execute automatically upon opening. Due to the encryption and lack of readable document body or script content, the exact payload delivery mechanism cannot be determined, but the structure strongly implies a malicious intent.

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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