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

Static analysis result for SHA-256 71ff3ef25df1adae…

MALICIOUS

Office (OLE) / .XLS

192.0 KB Created: 2020-11-09 01:15:26 Authoring application: Microsoft Excel
MD5: 88ab1cc135b36d6202c2739d315bdefc SHA-1: 63fe21a623123dc0c95cb88102e7bfa8023b5e10 SHA-256: 71ff3ef25df1adaeb2ec9b699a07cf109e78f6010815657f7f54d3dbad5242ce
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 macro sheet that is encrypted, indicated by the 'OLE_XLM_ENCRYPTED_MACROSHEET' heuristic. The presence of an 'AUTOOPEN' macro suggests it is designed to run automatically when the spreadsheet is opened. The document body was unreadable, preventing further analysis of its specific intent.

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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