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

Static analysis result for SHA-256 9ed53f6713fecf85…

MALICIOUS

Office (OLE) / .XLSX

311.0 KB Created: 2020-07-02 12:55:44 Authoring application: Microsoft Excel
MD5: 954e437c4e9f66a2b49db01d6e6b1041 SHA-1: 141f6f85845922aee4e00f0bd17182895f7194b1 SHA-256: 9ed53f6713fecf854ffb5489fa9a1cdbc8f249870f944434ee3940c8d633df4b
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The presence of encrypted Excel 4.0 macros (XLM) is a strong indicator of malicious intent, as this is a common technique for obfuscating malware delivery. The 'OLE_XLM_ENCRYPTED_MACROSHEET' and 'OLE_XLM_AUTOOPEN' heuristics confirm the use of this method. Without further script content or network indicators, the exact payload and delivery mechanism remain unclear, leading to an 'unknown family' classification.

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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