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

Static analysis result for SHA-256 03366fc9aeab827d…

MALICIOUS

Office (OLE) / .XLS

210.5 KB Created: 2020-09-23 01:02:53 Authoring application: Microsoft Excel
MD5: c8f8858700122223a7a29df104c30758 SHA-1: d45ea66bf76f77ef27fd541411e5a470783d79d3 SHA-256: 03366fc9aeab827d001eb814954a5ab2f3b37adefa9b6167495145ba0f58a2a0
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel file containing an encrypted Excel 4.0 macro sheet, identified by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. This suggests the file is designed to run malicious macros, likely for initial execution of a payload. The presence of an auto-open macro further supports this. No specific family could be identified.

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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