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

Static analysis result for SHA-256 0909cec03bb1ca92…

MALICIOUS

Office (OLE) / .XLSX

203.0 KB Created: 2020-10-18 22:55:30 Authoring application: Microsoft Excel
MD5: 9bc2154113ba091d093e93e67c738426 SHA-1: 36465213dd588f7243858e8e57fde215fed18b0a SHA-256: 0909cec03bb1ca92f55d8c684208dbbd4ad33785d832fd140cc8daeaf82dd87a
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file contains an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. This suggests the macro sheet is designed to execute code, likely for downloading and executing a secondary payload. The presence of an OLE_XLM_AUTOOPEN heuristic further supports the execution of macros upon opening the document.

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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