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

Static analysis result for SHA-256 dfe54a5cc97c3d0b…

MALICIOUS

Office (OLE) / .XLSX

38.5 KB Created: 2020-09-28 00:53:43 Authoring application: Microsoft Excel
MD5: ad5b000214a64cad18b5f6b71a1a67bd SHA-1: 6639a6cd5b781ffb9d746312609f8aeb0bccb6fc SHA-256: dfe54a5cc97c3d0b44b7182c6b7d43d161f27bd7bba0959f988e8ddd4be3d631
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an AUTOOPEN macro suggests it is designed to execute automatically upon opening. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific intent.

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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