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

Static analysis result for SHA-256 89a1a566060f50a1…

MALICIOUS

Office (OLE) / .XLS

67.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel
MD5: 8584178b387d7dfe4d8e75e13161348a SHA-1: ec49baa5d0d510e1cad1641ca5b205099cd3e5f8 SHA-256: 89a1a566060f50a174f4e9342e478b955105a9890bad400862d55a6b57f27f4c
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 auto-open macro (OLE_XLM_AUTOOPEN) suggests it is designed to execute automatically upon opening. Without a document body or script content, the exact payload and delivery mechanism cannot be determined, but the structure points to a malicious macro-based document.

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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