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

Static analysis result for SHA-256 bdca1a02b2f26fc1…

MALICIOUS

Office (OLE) / .XLS

236.5 KB Created: 2020-09-14 05:58:38 Authoring application: Microsoft Excel
MD5: bbd83c16ab4e739c63f35308dd1c3171 SHA-1: d249329502b1497b348d0e7a29a3a2b77a4c0fe4 SHA-256: bdca1a02b2f26fc14f0463d52dd324cfeeeaaa5dc4bbd218de85e1e7937cad8e
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 macros are present and likely intended to execute automatically. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific intent. Due to the encryption and lack of readable content, the exact payload and delivery mechanism cannot be determined.

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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