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

Static analysis result for SHA-256 3c86a2134495d264…

MALICIOUS

Office (OLE) / .XLS

177.0 KB Created: 2020-11-09 01:16:11 Authoring application: Microsoft Excel
MD5: b00a3bf016b09e07741b44e58c2684ae SHA-1: 6aa48c6062c67c44ef89fef2e8e69054809fc309 SHA-256: 3c86a2134495d26431c4b6892060b5929705c8ec646bf2589e71350000a42aff
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. This type of file is frequently used to hide malicious code that executes automatically upon opening. The presence of an auto-open macro (OLE_XLM_AUTOOPEN) further supports this. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific intent.

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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