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

Static analysis result for SHA-256 8c21dda00e56b114…

MALICIOUS

Office (OLE) / .XLSX

342.5 KB Created: 2021-12-17 13:23:39 Authoring application: Microsoft Excel
MD5: dde5804d360a4f4c559909ece5439d8c SHA-1: d4cba1fc1005c700efe9c5a9a84207311672afaf SHA-256: 8c21dda00e56b114d226a51beb73c1323e7a988b08b60a5dada10734033837be
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file is an Excel document identified as malicious due to the presence of an encrypted Excel 4.0 macro sheet. This type of macro sheet is often used to deliver malicious payloads. No specific IOCs were extracted, and the document body was heavily truncated, limiting further analysis.

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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