Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 c4b60c9023537e68…

MALICIOUS

Office (OLE)

288.5 KB Created: 2020-07-15 07:56:55 Authoring application: Microsoft Excel
MD5: fcf51d797f15a44c474dfcdbc1e89903 SHA-1: 5305ebf106fbf75e4a94e9cdc880d5d1909cedef SHA-256: c4b60c9023537e68309c20194ad83a2a9a6a87cf29200aaed7a6c8ad708f250c
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, as indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an auto-open macro (OLE_XLM_AUTOOPEN) suggests it is designed to execute malicious code upon opening. Without further script content or network indicators, the exact payload and delivery mechanism remain unclear, but the core functionality points to a macro-based execution.

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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