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

Static analysis result for SHA-256 888614bdf13110e3…

MALICIOUS

Office (OLE) / .XLSX

162.0 KB Created: 2021-05-27 14:59:58 Authoring application: Microsoft Excel
MD5: 40bfdb9c9c1535435fdedc666c34ba20 SHA-1: c6e6ebf08508962edcdf5c294aad95de9538e6ca SHA-256: 888614bdf13110e3934ff3a852074f6cde2998db6631d443bdee73dec5ecfe30
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel file containing encrypted Excel 4.0 macros, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET and OLE_XLM_AUTOOPEN heuristic firings. The presence of encrypted macros strongly suggests an intent to execute arbitrary code. However, the document body is heavily truncated and unreadable, and no specific URLs or scripts were extracted, limiting further analysis of the 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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