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

Static analysis result for SHA-256 e5570d957e40a891…

MALICIOUS

Office (OLE) / .XLS

117.5 KB Created: 2020-10-06 03:01:38 Authoring application: Microsoft Excel
MD5: 3674dc21f8a3be6442c15e4f5dabdd6d SHA-1: 7f9b1be4c406c073dbc4edae53452440f612e4b7 SHA-256: e5570d957e40a89120ae3828b835992d51f848d359a8549733ddca6932903d24
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 a macro is set to execute automatically when the file is opened. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific intent. However, the combination of encryption and auto-executing macros strongly implies a malicious 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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