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

Static analysis result for SHA-256 22a04ec533322f6d…

MALICIOUS

Office (OLE) / .XLS

298.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 5938eec8bed03b1e9f1debc3e949592e SHA-1: fd164563202f9de52c6f0eba819322398efdb14f SHA-256: 22a04ec533322f6dbf3a1e99bc9094e6ecf2c7ce9bb2bfaa801cf30ed4aa0aba
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 OLE_XLM_AUTOOPEN heuristic suggests that the macro is designed to run automatically when the spreadsheet is opened. The document body is heavily obfuscated and truncated, preventing a detailed analysis of its specific payload or intent. However, the presence of encrypted macros strongly suggests a malicious purpose, likely for initial execution of a secondary payload.

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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