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

Static analysis result for SHA-256 5fdb1b3df88e4912…

MALICIOUS

Office (OLE) / .XLS

254.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 7e15415b138af90c8388aa309276ef7e SHA-1: 23aba1aaf9d35894333fe29c86f76a236f602bdd SHA-256: 5fdb1b3df88e49123804cb3cbdfee96b1e29371ca7ac6f27e3c57228a563aa10
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 code is designed to execute automatically upon opening the spreadsheet. The document body is heavily obfuscated and truncated, preventing a detailed analysis of its specific payload or intent, but the macro execution capability is a strong indicator of malicious activity.

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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