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

Static analysis result for SHA-256 10981817b3227bea…

MALICIOUS

Office (OLE) / .XLSX

320.5 KB Created: 2020-07-02 12:55:44 Authoring application: Microsoft Excel
MD5: d9c75696bdf564ed0a046c9afb1510f4 SHA-1: 09362848a75e67f7aea7558a718ddce0442507b4 SHA-256: 10981817b3227bea76ec4cadccca9954f89aaabdfaad448d42f725c1c06681d8
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The presence of an encrypted Excel 4.0 macro sheet, identified by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic, strongly suggests malicious intent. The OLE_XLM_AUTOOPEN heuristic further indicates that this macro sheet is designed to execute automatically. Without a document body or script content, the specific payload and ultimate goal 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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