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

Static analysis result for SHA-256 c7e40628fb6beb52…

MALICIOUS

Office (OLE) / .XLS

83.0 KB Created: 2021-01-21 18:32:50 Authoring application: Microsoft Excel
MD5: 50fecec126570e4b8fcd531d6711879a SHA-1: 9166aee4a6815e4f67e0ae43344d8ca144958d47 SHA-256: c7e40628fb6beb52d9d73a3b3afd1dca5d2335713593b698637e1a47b42bfc71
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 OLE_XLM_AUTOOPEN heuristic suggests that the macro sheet is designed to execute automatically upon opening. While no specific payload or URLs were extracted, the nature of the heuristics points towards a malicious macro designed for initial execution.

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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