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

Static analysis result for SHA-256 81eade3eed870703…

MALICIOUS

Office (OLE) / .XLS

184.5 KB Created: 2020-11-09 01:16:41 Authoring application: Microsoft Excel
MD5: e9f76a114b8795b211f5f8c2209c519f SHA-1: 3ed79fee7ff6247a15180259d58ca27d73548051 SHA-256: 81eade3eed870703d86014d2073e677fc8aac2bcd6409dfc71e7df33ac45c160
60 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment 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. While the document body is heavily obfuscated and unreadable, the heuristics strongly point to a malicious macro-based delivery mechanism. No specific IOCs were extracted due to the obfuscation.

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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