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

Static analysis result for SHA-256 bd59566e1dc285c7…

MALICIOUS

Office (OLE) / .XLS

177.5 KB Created: 2021-02-23 19:30:17 Authoring application: Microsoft Excel
MD5: 538a7dc92c5ac91663d8ab3fdef21729 SHA-1: 5efe4d1536f548155794a50aff6448c7cf209889 SHA-256: bd59566e1dc285c71e706b2d3d1f44e15a5acc53ceb661241ad94d9d683ea853
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 OLE_XLM_AUTOOPEN heuristic suggests that macros are present and likely intended to run automatically. While no specific URLs or scripts were extracted, the nature of encrypted macro sheets strongly suggests a downloader or droppper functionality.

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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