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

Static analysis result for SHA-256 e59bd2dcd8254bcb…

MALICIOUS

Office (OLE) / .XLS

196.0 KB Created: 2020-11-09 01:16:41 Authoring application: Microsoft Excel
MD5: f0c89e7120949065d188d160db759928 SHA-1: a6bdf9bbba878d042317a6f70ff3d353299a5161 SHA-256: e59bd2dcd8254bcb468dbca68493e93c9992d353c0eadc79bf4c4723a581a670
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 when the spreadsheet is opened. Due to the encryption and lack of readable document body or script content, the specific payload and delivery mechanism cannot be determined, leading to an unknown family classification.

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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