MALICIOUS
200
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1203 Exploitation for Client Execution
The file contains legacy Excel 4.0 (XLM) macros, indicated by multiple critical heuristic firings including OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN. The macros utilize dangerous functions such as RUN, suggesting an intent to execute arbitrary code. The presence of strings like 'Classic.Poppy by VicodinES' and 'The Narkotic Network 1998' points to known malware families, though a specific family could not be definitively identified. The macro also attempts to write to the Book1.xls file in the xlstart directory, a common technique for persistence.
Heuristics 4
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Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAMEoletools 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.
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XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FNExcel 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.
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Legacy Excel formula macro virus marker critical OLE_XLS_FORMULA_MACRO_VIRUSWorkbook 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.
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Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPENWorkbook 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.
| Filename | Kind | Source | Size |
|---|---|---|---|
xlm_macros.txt |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 490402 bytes |
SHA-256: d2fd01c61d14a54e8d8213561dce4fe5aede6d957189749310641c9bb552ec3d |
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Preview scriptFirst 1,000 lines of the extracted script
' 0085 10 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - c ' 0085 10 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - M ' 0085 10 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - C ' 0085 10 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - C ' 0085 10 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - L ' 0085 10 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - L ' 0085 10 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - L ' 0085 10 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - L ' 0085 10 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - L ' 0085 10 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - L ' 0085 22 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - L á ' 0085 10 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - n ' 0085 26 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - B ¢ N G ' 0085 14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - SDD.T ' 0085 10 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - M ' 0085 10 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - 1 ' 0085 10 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - 1 ' 0085 10 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - 1 ' 0085 9 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - ' 0085 9 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - ' 0085 9 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - ' 0085 9 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - ' 0085 9 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - ' 0085 16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, hidden - XL4Popp ' 0018 31 LABEL : Cell Value, String Constant - _Fill hidden len=11 ptgArea3d *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x0c\x00\x03\x008\x00\x00\x00\x00\x00' ' 0018 23 LABEL : Cell Value, String Constant - built-in-name 2 Auto_Close len=7 ptgRef3d SDD.T!C4 ' 0018 23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d SDD.T!C4 ' 0018 26 LABEL : Cell Value, String Constant - Bust len=7 ptgRef3d SDD.T!C31 ' 0018 29 LABEL : Cell Value, String Constant - cap len=11 ptgArea3d *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x07\x00\xdf\x00\xdf\x00\x01\x00\x08\x00' ' 0018 28 LABEL : Cell Value, String Constant - cap0.7 len=7 ptgRef3d c!G20 ' 0018 24 LABEL : Cell Value, String Constant - CL len=7 ptgRef3d L!D77 ' 0018 30 LABEL : Cell Value, String Constant - Continue len=7 ptgRef3d SDD.T!C9 ' 0018 30 LABEL : Cell Value, String Constant - ctdn9697 len=7 ptgRef3d L!D511 ' 0018 29 LABEL : Cell Value, String Constant - dao len=11 ptgArea3d *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x08\x00\x1c\x00\x1c\x00\x01\x00\x07\x00' ' 0018 30 LABEL : Cell Value, String Constant - dao1 len=11 ptgArea3d *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x08\x00\x9e\x00\x9e\x00\x01\x00\x07\x00' ' 0018 30 LABEL : Cell Value, String Constant - dao1 len=11 ptgArea3d *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x05\x00\xbc\x00\xbc\x00\x01\x00\x07\x00' ' 0018 30 LABEL : Cell Value, String Constant - dao2 len=11 ptgArea3d *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x05\x00\xa0\x00\xa0\x00\x01\x00\x07\x00' ' 0018 31 LABEL : Cell Value, String Constant - daotd len=11 ptgArea3d *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x05\x00B\x01B\x01\x01\x00\x07\x00' ' 0018 29 LABEL : Cell Value, String Constant - dap len=11 ptgArea3d *INCOMPLETE FORMULA PARSING* Remaining, ... (truncated) |
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