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

Static analysis result for SHA-256 a818af0d4996a212…

MALICIOUS

Office (OLE) / .XLS

254.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 17735bdf3f19b51eaa45d6375f943f97 SHA-1: 657d6e9722ee904578d44e16d2c497f04d3bcb1e SHA-256: a818af0d4996a2120bc81e399b946f86b52fababc8904c49cd4ec1f298dc0199
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, as indicated by the OLE_XLM_ENCRYPTED_MACROSHEET heuristic. The OLE_XLM_AUTOOPEN heuristic suggests that macros are present and likely intended to run automatically. The document body content is heavily obfuscated and unreadable, preventing a more detailed analysis of the specific lure or payload. No URLs or other IOCs were extracted.

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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