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

Static analysis result for SHA-256 8df76765a19d8bc4…

MALICIOUS

Office (OLE) / .XLS

197.0 KB Created: 2020-11-09 01:15:26 Authoring application: Microsoft Excel
MD5: 1aef0207269bfca80f5f119624528982 SHA-1: 795b85e8e900c655175cd31b3143aa07544bd66b SHA-256: 8df76765a19d8bc4817375921ed283a79fdbb93ada88ea7f67c7c90e5aa08270
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's designed to execute code upon opening. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific intent. However, the core functionality relies on the execution of XLM macros.

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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