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

Static analysis result for SHA-256 5b68d2a9ed5ee3d7…

MALICIOUS

Office (OLE) / .XLS

759.0 KB Created: 2016-02-18 15:08:01 Authoring application: Microsoft Excel
MD5: 825d3d84bbae136aec8346e590100578 SHA-1: 0e9a80fcba2730657762178f74307234bf2a04e4 SHA-256: 5b68d2a9ed5ee3d7b5fcda768fdf45c415c74171260387597dd92f3adcdd559b
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, as indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an AUTOOPEN macro suggests an attempt to automatically execute malicious code when the spreadsheet is opened. No specific IOCs were extracted, and the family is unknown due to the encrypted nature of the macros.

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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