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

Static analysis result for SHA-256 7fcf7ee56e18d1ac…

MALICIOUS

Office (OLE) / .XLS

191.5 KB Created: 2020-11-09 01:17:34 Authoring application: Microsoft Excel
MD5: 7a42028805503f0f828fc08e7c0a098f SHA-1: 5039688d61f9dd3318445c9beb2f9cbd663ce30e SHA-256: 7fcf7ee56e18d1ac027e12a34188a923974ab801e59ce5da1e286b4c61b42fab
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file 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. The encrypted nature and macro sheet structure strongly imply it's a downloader for a secondary stage, though the specific payload and delivery mechanism are not discernible from the provided evidence.

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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