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

Static analysis result for SHA-256 a6eb350d57e07a68…

MALICIOUS

Office (OLE) / .XLS

245.5 KB Created: 2020-09-20 23:07:45 Authoring application: Microsoft Excel
MD5: a09ce707bb8f0f6f687b2881ce8a3fc1 SHA-1: c52b4f13ee25641a9ad219ac9ab1f1d6a6fd9d75 SHA-256: a6eb350d57e07a6812c59bdf3d8df7c94b299256f14fffec31e16e3dda901f14
60 Risk Score

Malware Insights

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

The sample is an Excel 4.0 macro sheet that is encrypted, which is a strong indicator of malicious intent. The presence of an 'AUTOOPEN' macro further suggests that malicious code is intended to run automatically upon opening the document. The encrypted nature of the macro sheet prevents detailed analysis of its specific actions, but the overall pattern points to a macro-based attack.

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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