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

Static analysis result for SHA-256 1422d8fb7423d843…

MALICIOUS

Office (OLE) / .XLSX

325.5 KB Created: 2020-07-02 12:55:44 Authoring application: Microsoft Excel
MD5: c6ef74e116f458a627c71b56236bd042 SHA-1: 7a08d3e90dae7a2925324382473550cee2dd58da SHA-256: 1422d8fb7423d8439047c74717a56658b19359cf55999c09a896e086e2168280
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel file identified as malicious due to the presence of an encrypted Excel 4.0 macro sheet. This type of macro sheet is often used to download and execute further malicious payloads. The specific macro sheet was detected with an 'AUTOOPEN' heuristic, suggesting it may execute automatically when the workbook is opened.

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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