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

Static analysis result for SHA-256 e557f8fe3c35065f…

MALICIOUS

Office (OLE) / .XLS

226.5 KB Created: 2020-10-07 06:39:13 Authoring application: Microsoft Excel
MD5: 31411cd8e75ed9fff030ee44cb19bb1b SHA-1: 54b06bab9f35ddd6212d0c9fda8933d596796d91 SHA-256: e557f8fe3c35065f0461ad9a8a784c66b0f0ccf435c1f36b8210019fe9c292f7
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The OLE_XLM_AUTOOPEN heuristic further suggests that macros are present and likely intended to run automatically. Due to the encrypted nature and lack of readable document body or script content, the specific payload and delivery mechanism cannot be determined, 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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