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

Static analysis result for SHA-256 144b05016c2e9750…

MALICIOUS

Office (OLE) / .XLS

57.0 KB Created: 2020-05-05 22:20:39 Authoring application: Microsoft Excel
MD5: 7971dbb315eae3413e7bd7fd119b8cb7 SHA-1: 38dd30e35d4f151bef347ea2b26905d4743424be SHA-256: 144b05016c2e9750daf896aac658f46887706424a3c2730566c4cf5aeb787d3a
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, as indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. This suggests the file is designed to execute malicious macros when opened. The specific functionality of the macro is obscured by encryption, preventing further analysis of its exact behavior or payload.

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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