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

Static analysis result for SHA-256 2c03916f18aac1fe…

MALICIOUS

Office (OLE) / .XLS

271.0 KB Created: 2020-04-23 12:26:24 Authoring application: Microsoft Excel
MD5: 38be5283a775caba96abffa8094d2651 SHA-1: 40541a43f79da087c246edce7712727d24a48e62 SHA-256: 2c03916f18aac1fe632e6df6f918e7130fe2a3d414fd977661ab320ee465f24a
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 auto-open macro (OLE_XLM_AUTOOPEN) suggests it's designed to execute automatically upon opening. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure or payload delivery mechanism. Therefore, the exact attack pattern and family remain unknown, but the core mechanism is macro-based execution.

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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