Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 2e62bc4e29beddbd…

MALICIOUS

Office (OLE)

94.5 KB Created: 2008-03-24 01:08:26 Authoring application: Microsoft Excel
MD5: 45cb9cf239e7ed4f5adfff67c03f4aaa SHA-1: 99a23fed5d0bd130948082483b9a4afc1c375818 SHA-256: 2e62bc4e29beddbdebe7734f95b7d96f11f553f43292d41c6490f693adb624d7
200 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open macro, which is a strong indicator of malicious intent. The heuristics indicate the use of dangerous formula APIs like RUN, suggesting the macro attempts to execute arbitrary code. The embedded text mentions 'Classic.Poppy by VicodinES' and 'The Narkotic Network 1998', which are likely indicators of the malware's origin or name. The macro also appears to target the xlstart folder, indicating an attempt to infect other Excel workbooks.

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
09d90d78c5255a223aa965f9eb73295de7da40fd73b30976ed3f5abdd5617a8d		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 16208 bytes

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