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

Static analysis result for SHA-256 4f2b9f453705b198…

MALICIOUS

Office (OLE) / .XLS

125.1 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: b7a31bb0dc5f3d906e6a67d9df45461c SHA-1: e016cd92574bcfba9bd1c7eb7f82228bf903184f SHA-256: 4f2b9f453705b1984b3701d0ac757fcd98dba87a082291a517d24c47ca082181
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 and OLE_XLM_AUTOOPEN heuristics. This suggests the file is designed to run embedded macros upon opening. The encrypted nature and lack of readable document body text prevent further analysis of the specific payload or lure, but the presence of XLM macros points to a common delivery mechanism for older malware or exploits.

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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