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

Static analysis result for SHA-256 d5f723b139eeaf03…

MALICIOUS

Office (OLE) / .ORI

473.0 KB Created: 2009-03-26 02:38:04 Authoring application: Microsoft Excel
MD5: c971d41d092ccc9cfdcb8f6a3bcdc3a6 SHA-1: 44eeabba2b47bae41c3dfd7db1f2b6d2ea70d66c SHA-256: d5f723b139eeaf03ac2812a5efa955c774d8736a134184e7b4fa60de9f5178f1
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The sample contains critical Excel 4.0 (XLM) macro firings, specifically indicating the presence of an Auto_Open macro and the use of dangerous functions like RUN. The document body explicitly mentions 'Excel Formula Macro Virus (XF.Classic)' and 'Poppy by VicodinES', along with instructions to 'Add New Workbook, Infect It, Save It As Book1.xls'. This strongly suggests the macro is designed to infect other Excel files, particularly those in the startup directory, and potentially download further stages.

Heuristics 4

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
addeef417364e4d75e4dcf012394695c9358373da42c5681ecaab8356370f703		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 11576 bytes

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