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

Static analysis result for SHA-256 f492e30da6b0acde…

MALICIOUS

Office (OLE) / .XLSX

228.5 KB Created: 2021-12-16 12:07:56 Authoring application: Microsoft Excel
MD5: ba5ae4de55adf2ec719f79b840eb60bf SHA-1: 63a7823acbed4be2b2be9be9dfe3b542b2d10bf2 SHA-256: f492e30da6b0acde4fe66be137bd5d9c63c8d588d0974ff039aa19a4f027232c
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel file containing an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an OLE_XLM_AUTOOPEN heuristic suggests that the macro is designed to execute automatically upon opening the document. The document body is heavily obfuscated and truncated, preventing a clear understanding of its specific lure. However, the core functionality points to a macro-based execution of malicious code.

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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