Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6da121f3f2cbcc40…

MALICIOUS

Office (OLE)

28.5 KB Created: 2010-05-26 09:14:37 Authoring application: Microsoft Excel
MD5: 409197181fc2e557fa2f433fbb6c01cc SHA-1: 762ab3a846a10cb2a5a52b181f8753a73792346a SHA-256: 6da121f3f2cbcc40062cf715551e7ef76f4d50f7d1725970d3f968feba0b847b
200 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file contains critical heuristics indicating the presence of Excel 4.0 (XLM) macros, specifically an Auto_Open macro that utilizes dangerous functions like RUN. The document body and macro artifacts reveal strings related to 'Classic.Poppy by VicodinES' and 'The Narkotic Network 1998', suggesting a legacy macro virus. The macro's intent appears to be infecting other workbooks by saving itself as 'Book1.xls' in the XLSTART directory, a common technique for macro-based malware.

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
31b6da1fe6ad794d596210d876a83ec012ca8f8906dec711998ebde154ed23de		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 9576 bytes

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