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

Static analysis result for SHA-256 dde907d7612c2d4f…

MALICIOUS

Office (OLE) / .XLS

1.65 MB Created: 2004-05-27 00:47:20 Authoring application: Microsoft Excel
MD5: e6214b5e6ea54a2f6916ce4b741f1bfb SHA-1: a2e8875bb90d6cd769c265ff435cd84eed8a5fef SHA-256: dde907d7612c2d4f43731e81f72db46a07035b10bc723cd18739a2d9eb5d2701
80 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The sample is an Excel 4.0 (XLM) macro sheet, identified by the OLE_XLM_AUTOOPEN heuristic. The DOC BODY contains explicit references to 'Excel Formula Macro Virus (XF.Classic)' and 'Poppy by VicodinES', indicating a known legacy macro virus. The virus appears to infect other workbooks, specifically targeting 'Book1.xls' in the 'xlstart' directory, suggesting an attempt at self-propagation and persistence.

Heuristics 2

  • Legacy Excel formula macro virus marker critical OLE_XLS_FORMULA_MACRO_VIRUS
    Workbook stream contains self-identifying legacy Excel formula macro virus markers. This indicates the document carries formula macro virus content even when no VBA project or modern XLM macro-sheet structure is present.
  • 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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