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

Static analysis result for SHA-256 fd66cda00a358cc0…

MALICIOUS

Office (OLE) / .XLS

125.1 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: a2908ed51cf0657ac9a8d6b50597ac6f SHA-1: 57adb2a912795fcde377d5136ff789a4bd0e1d85 SHA-256: fd66cda00a358cc0013668efe7068c3c09307e29ac7e45b726a3f768217346bc
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 AutoOpen macro (OLE_XLM_AUTOOPEN) suggests that the macro sheet is designed to execute automatically upon opening the spreadsheet. The document body is unreadable, but the heuristics strongly indicate a malicious macro execution attempt.

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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