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

Static analysis result for SHA-256 c077b34b2f1615ac…

MALICIOUS

Office (OLE) / .XLS

182.0 KB Created: 2021-02-23 19:30:17 Authoring application: Microsoft Excel
MD5: 47cc0cfc230e5faedf83cd439a31b8cb SHA-1: cc0f8b20483d365c5380a252e3ab5d7d5979ffe9 SHA-256: c077b34b2f1615ac33678bf341fd158e09363be5028305e4be906a0ea8ca535e
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 OLE_XLM_AUTOOPEN heuristic further confirms the presence of an auto-executable macro. While no specific payload or URL was extracted, the nature of the heuristics strongly suggests this file is designed to execute malicious code upon opening.

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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