Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 147feab74e172561…

MALICIOUS

Office (OLE)

39.5 KB Created: 2000-12-31 23:44:28 Authoring application: Microsoft Excel
MD5: 5972818d638e64c9fde14fd2e8805c10 SHA-1: cfcb70f33b41eb62c3650d579bbd466efa537529 SHA-256: 147feab74e172561b1c16d4f77c0437f9b04d28110192de07c49100989099a7f
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains critical heuristics indicating the presence of Excel 4.0 (XLM) macros, specifically an Auto_Open macro that utilizes dangerous formula APIs like RUN. The document body and macro scripts reveal references to 'Poppy by VicodinES' and 'The Narkotic Network 1998', suggesting a legacy malware strain. The macro is designed to infect other workbooks and save them as 'Book1.xls' in the 'xlstart' directory, indicating an attempt to establish persistence or spread.

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
485f9c8d9c22a81558245f35c810d729c848d5dbf8c5229f8efd609938d7be2b		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 15774 bytes

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