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

Static analysis result for SHA-256 fc30edf4e1a28918…

MALICIOUS

Office (OLE) / .XLS

198.5 KB Created: 2021-02-23 19:30:51 Authoring application: Microsoft Excel
MD5: cf75715edcf7a9f6ba673c9a2602d010 SHA-1: 9d321839fc0bbe32656931dbff4d69787d9025e5 SHA-256: fc30edf4e1a289183150ccfb00467743ebff4e572141bcb93e119fda40bb40a7
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 auto-open macro (OLE_XLM_AUTOOPEN) suggests it is designed to execute automatically upon opening. While no specific payload or URLs were extracted, the nature of the heuristics points to a malicious document designed for payload delivery.

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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