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

Static analysis result for SHA-256 6346b797501676fd…

MALICIOUS

Office (OLE) / .XLS

65.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: dda364a5f867d61cb46d1ee9bca94922 SHA-1: 82f0a37c8cdd28b9f467c4f9ed236660246cba04 SHA-256: 6346b797501676fde1f51363c7fd0834a532b39dbadcdf4339b42199648408dc
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The sample is an encrypted Excel 4.0 macro sheet, indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an AUTOOPEN macro suggests an attempt to automatically execute code upon opening. This type of macro is commonly used to download and execute further malicious content, hence the classification as an unknown family downloader.

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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