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

Static analysis result for SHA-256 d3e6387c8c6ba306…

MALICIOUS

Office (OLE) / .XLS

370.5 KB Created: 2018-12-10 14:35:46 Authoring application: Microsoft Excel
MD5: c93ffce9f1f665dd7ebb7ed8160132c0 SHA-1: c8947bd48ccd0ce4547cd7e3c1db68b24ea91547 SHA-256: d3e6387c8c6ba3060a1dd90333a80ccac9c5dee328770f22e6860d314d8eb547
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 AUTOOPEN macro suggests it is designed to run automatically upon opening. The document body is heavily corrupted and unreadable, preventing a more specific analysis of the lure or payload. The encrypted nature and use of XLM macros point to a downloader or initial access mechanism.

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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