Malicious Office (OLE) / .XLSX — malware analysis report

Static analysis result for SHA-256 25f10fd800ff55d3…

MALICIOUS

Office (OLE) / .XLSX

24.5 KB Created: 2002-06-27 04:53:51 Authoring application: Microsoft Excel
MD5: ac66a111f202579c25ff51eaa05d87f1 SHA-1: cc0d4ebb1f3aa51b9f610b8378ef936bdf565d30 SHA-256: 25f10fd800ff55d398a3cd7348233ad066d3f84ae094b8a5ca606256a877a542
200 Risk Score

Malware Insights

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

The file contains critical heuristic firings indicating the presence of Excel 4.0 (XLM) macros, specifically an Auto_Open macro. The extracted document body and script content reveal references to 'Poppy by VicodinES', 'The Narkotic Network 1998', and a path that suggests an attempt to place a malicious file in the Excel startup directory. The Auto_Open macro likely executes a dangerous formula API such as RUN, indicating it's designed to download and execute a second-stage payload.

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
d7ac61bde6f351445de41322d53c5758115fa033c8bd844a77a72c7d108e267c		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 9484 bytes

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