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

Static analysis result for SHA-256 2324bd01d911cf20…

MALICIOUS

Office (OLE) / .XLS

59.0 KB Created: 2020-04-27 23:19:44 Authoring application: Microsoft Excel
MD5: cc5cd531a77eade3c797a34d6d6f0bf4 SHA-1: 78c77ae450a2f6fc861a5765e4e20a90f1bcd83a SHA-256: 2324bd01d911cf20c75170b3ce6e0f6f2b6e60713812868e8501977f04c84993
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. Due to the encryption and lack of readable document body or script content, the exact payload delivery mechanism cannot be determined, but the structure strongly implies a malicious macro-based 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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