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

Static analysis result for SHA-256 5d55e80c380a9521…

MALICIOUS

Office (OLE) / .XLS

245.0 KB Created: 2020-11-11 04:31:47 Authoring application: Microsoft Excel
MD5: d99ba60cded30dd3c5345dab801bb204 SHA-1: 1c60a29dc239fc83f03ae5725e68bbe2ce61e6e4 SHA-256: 5d55e80c380a95212c07cdcf0f2c49d182d155a261e7720a8758dcfb0c61109c
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, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. This suggests the file is designed to run malicious macros. The OLE_XLM_AUTOOPEN heuristic further confirms the presence of an auto-executable macro. Without a document body or script content, the exact payload and execution flow remain unclear, leading to a moderate confidence score.

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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