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

Static analysis result for SHA-256 45ccba341f5a78e2…

MALICIOUS

Office (OLE) / .XLS

42.5 KB Created: 2020-10-16 11:38:24 Authoring application: Microsoft Excel
MD5: def969cd0e44416c19aa73f6bc55417c SHA-1: 74fa0096843986e19affcf30747de9a602cdec69 SHA-256: 45ccba341f5a78e22dc6bfebe6f516bddabc0e5198edb55cfadaeac895ca1525
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 execute automatically upon opening. Due to the encryption and lack of readable document body or script content, the exact payload and delivery mechanism cannot be determined, but the presence of these heuristics strongly suggests a malicious intent to execute code.

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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