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

Static analysis result for SHA-256 2302f75d2a0891d3…

MALICIOUS

Office (OLE) / .XLS

246.0 KB Created: 2020-09-14 21:28:14 Authoring application: Microsoft Excel
MD5: 9f171583ec0d7b08af6aa1eaf1367a24 SHA-1: 7faa446cd24f67e00c12ece5f75ce25f045c6f04 SHA-256: 2302f75d2a0891d3a7031ffb5eebee5f561d3998ce8e08fc4cea9fee8ba30fdd
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an encrypted Excel 4.0 macro sheet, as indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The presence of an auto-open macro (OLE_XLM_AUTOOPEN) suggests it is 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 uncertain.

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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