Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 47eafba484079fa8…

MALICIOUS

Office (OLE)

338.0 KB Created: 2020-07-13 11:03:58 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: 19f638b99815a1e1862ad2c36448eb31 SHA-1: d2314e3f0a5a476b4dc479f6f5cc8a5fb3ea95c2 SHA-256: 47eafba484079fa8aa5d24fbc4b7cca836f3695b9276770f48b0d134041d3f5e
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel file containing an encrypted Excel 4.0 macro sheet, indicated by the 'OLE_XLM_ENCRYPTED_MACROSHEET' heuristic. The presence of an 'AUTOOPEN' macro suggests it is designed to execute automatically when the document is opened. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific intent.

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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