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

Static analysis result for SHA-256 e4db906633b826b9…

MALICIOUS

Office (OLE) / .XLSX

89.0 KB Created: 2021-05-26 15:30:00 Authoring application: Microsoft Excel
MD5: d2ed93283144a3049c608429bb2ce89c SHA-1: 71b80d3b25285c9b7202c9b3fe9a310aed988f44 SHA-256: e4db906633b826b98a70dfc1f9a59c89139b041cc200c1c8021057e40151d28e
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, indicating a malicious intent to hide its functionality. The presence of encrypted macros is a strong indicator of malicious activity, likely for executing further stages of an attack. No specific IOCs were extracted due to the encrypted nature of the macros.

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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