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

Static analysis result for SHA-256 f1651ac0f683287e…

MALICIOUS

Office (OLE) / .XLSX

310.5 KB Created: 2020-07-02 12:55:44 Authoring application: Microsoft Excel
MD5: 8e134106a223d869b46773e82575769f SHA-1: 7ceb0ddef38963b946c5f4e982ceb07401cb9593 SHA-256: f1651ac0f683287e0f38acd67cc3d267d8066dbc875020eb6a8621327b485dd8
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 heuristic. The presence of an AutoOpen macro (OLE_XLM_AUTOOPEN) suggests an attempt to automatically execute malicious code upon opening the document. 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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