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

Static analysis result for SHA-256 282f5b15cdf8952d…

MALICIOUS

Office (OLE) / .XLS

212.5 KB Created: 2020-09-23 01:02:26 Authoring application: Microsoft Excel
MD5: 1fb660211d66a06889cfb4c46a0282d2 SHA-1: 4f7f8d03d8f46db1747c1acaaabe84f01995529a SHA-256: 282f5b15cdf8952d4fa93f73d82a7a8273a6fee62ef67344fac3c9b1f7611dfb
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 OLE_XLM_AUTOOPEN heuristic further suggests that macros are present and likely intended to execute automatically upon opening. The document body is heavily obfuscated and unreadable, preventing further analysis of its specific intent. Due to the lack of readable content and scripts, the exact payload delivery mechanism cannot be determined.

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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