Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 b67ac718173d1475…

MALICIOUS

Office (OLE)

238.0 KB Created: 2020-08-26 03:47:30 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: c9156908b4eeca7aa7bd826e82cecaf0 SHA-1: 97542716affbe08d61fa89ec140c34fbd6a8b3c5 SHA-256: b67ac718173d147591bd33bc2ae2291a36da795e9ad895fc2da732459c6c103a
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel file identified as containing an encrypted Excel 4.0 macro sheet. This indicates a likely attempt to execute malicious code, potentially for downloading and running a secondary payload. The presence of an encrypted macro sheet is a strong indicator of malicious 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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