Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 aa84384dfc44dcaa…

MALICIOUS

Office (OLE)

231.5 KB Created: 2020-08-26 03:47:30 Authoring application: Microsoft Excel First seen: 2020-09-07
MD5: cb37462eb98c8068091158046ae7ca54 SHA-1: 912646648927c2a8da9ad09592df29a6cf60a584 SHA-256: aa84384dfc44dcaaefdbbd59a3d1430382e2ccd2deb6f788449427e3ce01bf1b
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel file identified as containing encrypted Excel 4.0 macros. The presence of encrypted macros suggests an attempt to conceal malicious code execution. While no specific URLs or scripts were extracted, the nature of the heuristics points towards a macro-based attack. Further analysis would be needed to determine the exact payload.

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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