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

Static analysis result for SHA-256 030af453e0140f45…

MALICIOUS

Office (OLE) / .XLS

254.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 32d28b4f61d985d50cf9beb53cee4ad7 SHA-1: e5abe4cfd0b9b23f7e3cf35a9df676d202d27887 SHA-256: 030af453e0140f45b22c9e2fa1dc1441371e55455e4d207eaed78229800ff6b7
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is an encrypted Excel 4.0 macro sheet, indicated by the 'OLE_XLM_ENCRYPTED_MACROSHEET' heuristic. This suggests the file was likely delivered as a spearphishing attachment. The macro sheet's presence and encryption point towards an attempt to hide malicious code execution, typical of macro-based malware.

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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