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

Static analysis result for SHA-256 982ad26e5e5c0ce6…

MALICIOUS

Office (OLE) / .XLSX

133.5 KB Created: 2020-07-01 09:47:51 Authoring application: Microsoft Excel
MD5: b9cadb79b0f963645eb3a9bcb06a1c3c SHA-1: 0570c0024e30149b5cb76d3cc624fa728682d1a0 SHA-256: 982ad26e5e5c0ce63c107d3517c69e85881339ff3e7f0678ebf25a273ad4ac14
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 heuristics. This strongly suggests the file is intended to deliver a malicious payload via macro execution. No specific family could be identified due to the lack of readable content and scripts.

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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