MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1059.001 PowerShell
The file is an Excel spreadsheet containing Excel 4.0 (XLM) macros. The critical heuristic OLE_XLM_DANGEROUS_FN indicates the presence of dangerous formula APIs within the Auto_Open macro, specifically the 'RUN' function. This suggests the macro is designed to execute arbitrary commands or download and run additional malicious content. The presence of an Auto_Open defined name further confirms the auto-execution capability. No specific family could be identified, but the technique is common for initial payload delivery.
Heuristics 3
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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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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.txta6f040454ef9873e4fef92783e2b8971e1cdaa5bdfebbfba4e84c1c30f9de690 |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 8038 bytes |
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