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

Static analysis result for SHA-256 6819951a1717c112…

MALICIOUS

Office (OLE) / .XLS

104.0 KB Created: 2020-04-21 13:56:55 Authoring application: Microsoft Excel
MD5: dc7936f485e66d0629f80aa772d25d57 SHA-1: 90b6466bf55a7e2c0a4f74853ebe5cd03eb7272e SHA-256: 6819951a1717c1127a9a577740a66ad1dbfb68f04291c54ea4b60fe04d979e40
100 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is an Excel 4.0 macro sheet, indicated by multiple heuristic firings including 'OLE_XLM_ENCRYPTED_MACROSHEET' and 'OLE_XLM_AUTOOPEN'. The presence of encrypted macros suggests an attempt to hide malicious functionality. The document body is heavily obfuscated and truncated, preventing a detailed analysis of its specific intent, but the macro sheet structure strongly implies code execution.

Heuristics 3

  • 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.
  • OLE metadata lists many Excel 4.0 macro sheets high OLE_XLM_DOCPROPS_MACROSHEET_INVENTORY
    Workbook contains a BIFF Excel 4.0 macro-sheet marker and its clear OLE DocumentSummaryInformation stream lists many MacroN sheet titles. This is a useful static signal when FILEPASS encryption prevents formula extraction from the workbook stream.
  • 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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