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

Static analysis result for SHA-256 d1d0ac76e59b9e2a…

MALICIOUS

Office (OLE) / .XLS

187.0 KB Created: 2021-06-01 12:24:56 Authoring application: Microsoft Excel
MD5: c41a21a821bcdea1d3ab26ebef055eed SHA-1: 912c8c1792dd33bac263df4b71242078d74741e9 SHA-256: d1d0ac76e59b9e2a8ae3a433e0186d74fc61417c89fe5ee4b93c02faa1dc58f8
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is 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 macros are configured to run automatically upon opening. The document body is unreadable, and no scripts were extracted, limiting further analysis of the payload delivery mechanism.

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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