Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 5cdbe240e0210e04…

MALICIOUS

Office (OLE)

85.0 KB Created: 2009-04-09 04:35:04 Authoring application: Microsoft Excel
MD5: df3ec6618f55b85c25343940041af88c SHA-1: 5909ebcc0231d45f6638d65935bd31384f3149d3 SHA-256: 5cdbe240e0210e04b1cba5093605c3866ef445b65317161d25fd4bdf914fe275
200 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macros, indicated by multiple critical heuristic firings including OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN. The macros utilize the RUN function, suggesting an intent to execute arbitrary code, likely for downloading and executing a second-stage payload. The presence of strings like 'XL4Poppy', 'Classic.Poppy by VicodinES', and 'The Narkotic Network 1998' within the macro context points to a known legacy macro virus family.

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
b839ce854317ca81e8c8cfe7c34f48d01b90b51178f4ec785f43beb33b2c8aed		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 98663 bytes

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