Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3301f3af60cc86e6…

MALICIOUS

Office (OLE)

21.0 KB Created: 2010-04-30 00:21:42 Authoring application: Microsoft Excel
MD5: 7495bfd92f9030719c8e6b5c464cdf36 SHA-1: e039924cff90733117d6c5e897cb8de254c1da6a SHA-256: 3301f3af60cc86e61f2cf395d0aaa8e32ec3c71fed4acd7e4dc74998f4265741
200 Risk Score

Malware Insights

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

The file is identified as a malicious Excel 4.0 (XLM) macro sheet due to critical heuristic firings indicating the presence of an Auto_Open defined name and the use of dangerous formula APIs like RUN. The document body and script content explicitly reference 'XLM Auto_Open' and 'Excel Formula Macro Virus (XF.Classic)', suggesting the primary intent is to infect other workbooks. The macro appears to be designed to spread itself by saving infected copies as 'Book1.xls' in the startup directory.

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
023cbdce503c2fd68ff886937b924008e513df683aa947966ed2749e95716fc0		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 5132 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.