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

Static analysis result for SHA-256 8fba68737719090e…

MALICIOUS

Office (OLE) / .XLS

213.0 KB Created: 2020-09-24 19:33:19 Authoring application: Microsoft Excel
MD5: df93e80d7f2afc7106f4a1416ce2eeab SHA-1: 5b831d56f353ca12e22ee20a86c2861c3f2bf826 SHA-256: 8fba68737719090e0cc6105b8913597f6ffee3c915eda38198489a5a0df9fa78
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 (OLE_XLM_AUTOOPEN) suggests that malicious code is intended to run automatically when the spreadsheet is opened. No specific IOCs were extracted, and the document body was unreadable.

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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