Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a2cd7fdc9f780d0c…

MALICIOUS

Office (OLE)

20.0 KB Created: 2010-06-20 17:28:37 Authoring application: Microsoft Excel
MD5: 08a37b75845a74d3ef2d2732d971c7b1 SHA-1: c4e7fcdb691be3688602d6338383c2436f1277d3 SHA-256: a2cd7fdc9f780d0cc2788fdf7dd9fdfba1dba0b6acd009f2165c8d30dcea9ccd
200 Risk Score

Malware Insights

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

The file contains critical heuristic firings indicating the presence of Excel 4.0 (XLM) macros, specifically an Auto_Open defined name. The macro sheet contains references to dangerous formula APIs like RUN, suggesting it attempts to execute arbitrary commands. The DOC BODY and script excerpts mention 'Classic.Poppy by VicodinES' and 'The Narkotic Network 1998', hinting at older macro virus techniques. The macro appears to be designed to infect other workbooks and potentially execute a payload from a specified path.

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
0d6c80d24bbb6824762d4651e9433b0085f0a729fc31b490bcf88a6b2962db47		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6162 bytes

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