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

Static analysis result for SHA-256 8ac7f8487f9e9836…

MALICIOUS

Office (OLE) / .XLS

215.5 KB Created: 2020-09-23 01:02:26 Authoring application: Microsoft Excel
MD5: d8d61b0c8297b0abe147265bab7c9cdb SHA-1: cfd3bbc08a0354040fc5963b6d508a330f308aad SHA-256: 8ac7f8487f9e98365d01e23718e2a9381167afdf5b70dc0cfe668d634ad28d52
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The presence of an encrypted Excel 4.0 macro sheet (OLE_XLM_ENCRYPTED_MACROSHEET) indicates that the file is likely malicious and intended to run arbitrary code. The 'autoopen' heuristic further supports this, suggesting the macros execute automatically. Without a document body or script content, the exact payload and delivery mechanism remain unclear, leading to a lower confidence in family attribution.

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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