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

Static analysis result for SHA-256 5268b8a946c64857…

MALICIOUS

Office (OLE) / .XLSX

208.5 KB Created: 2020-10-07 06:39:13 Authoring application: Microsoft Excel
MD5: 7410c28d2f9e5a0f3bd065700e8865d8 SHA-1: c61f38942e3a920ab1cc23cd760d02ba0dca2215 SHA-256: 5268b8a946c6485733be46c6db3a2bdbaf9e0fa4134acd9d18acb0ae84063a28
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an auto-open macro (OLE_XLM_AUTOOPEN) further suggests that malicious code is intended to execute automatically when the file is opened. Without a document body or script content, the specific payload and delivery mechanism remain unclear, leading to an unknown family attribution.

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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