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

Static analysis result for SHA-256 ee27be884433578e…

MALICIOUS

Office (OLE) / .XLS

398.0 KB Created: 2020-11-18 21:59:48 Authoring application: Microsoft Excel
MD5: f42aafdbdc0dfcea33cacc065a7ed64f SHA-1: 7d7479810bc54d5fc61e3c3e0c49a8f4f870b685 SHA-256: ee27be884433578e09b7476f95d1005a5bbe899f128c24417b8ae4fa722627b5
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, as indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The OLE_XLM_AUTOOPEN heuristic further confirms the presence of an auto-executable macro. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific intent. However, the presence of encrypted macros strongly suggests a malicious payload delivery mechanism.

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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