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

Static analysis result for SHA-256 8a4114e7b4a40203…

MALICIOUS

Office (OLE) / .X

33.5 KB Created: 2010-05-26 06:53:31 Authoring application: Microsoft Excel
MD5: c2f1040b2258c64f102eca769248cdc4 SHA-1: 998590e03f3c04abc3755bedb356a342a0797f4b SHA-256: 8a4114e7b4a402033eea549c7ffe6de6367411ffb795a8c0cae13c86526b838d
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

The file is an Excel 4.0 macro sheet containing an Auto_Open entry, which is a critical indicator of malicious intent. Heuristics confirm the presence of dangerous formula APIs like RUN, suggesting the macro attempts to execute arbitrary code. The 'DOC BODY' and script comments indicate this is a legacy Excel Formula Macro Virus, specifically referencing 'XF.Classic' and 'Poppy by VicodinES'. The macro likely attempts to infect other workbooks or establish persistence by writing to startup locations, as suggested by the presence of 'xlstart\Book1.' and the Auto_Open/Auto_Close entries.

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
942ac43320bcb29c6b18ca2867bdf38d672f3a8e4670335668f6644eb034c269		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 11370 bytes

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