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

Static analysis result for SHA-256 28beb49e9a4c6b15…

MALICIOUS

Office (OLE) / .XLSX

244.5 KB Created: 2020-09-14 05:57:51 Authoring application: Microsoft Excel
MD5: 36acadfa8ef988ad55f8de45526cff98 SHA-1: 0e5f666b71ce40b1575291baccaf1e2eb4f3368d SHA-256: 28beb49e9a4c6b1503543e8ff47d3bbf026be85e65d7f54353408585f55550e2
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic for Applications

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) further suggests that malicious code is intended to execute automatically upon opening the file. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific lure or payload. Without readable script content or extracted URLs, the exact execution flow and final payload remain unknown.

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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