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

Static analysis result for SHA-256 cf4c2af3c3e4ec46…

MALICIOUS

Office (OLE) / .XLSX

386.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: d16f23f1d5b520fa2407793e2318bbec SHA-1: 58d25900741a1a1fc5e8617322eab6957c520c44 SHA-256: cf4c2af3c3e4ec4658c9ee98da829643c85071dec8b91085af1c2ee2811d406a
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 heuristic firings. The presence of encrypted macros suggests an attempt to hide malicious functionality, likely for initial execution or payload delivery. No specific family could be identified due to the obfuscation.

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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