MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1566.001 Spearphishing Attachment
The critical heuristic OLE_XLM_DANGEROUS_FN indicates the presence of dangerous Excel 4.0 macro functions, specifically 'RUN'. This suggests the macro is designed to execute arbitrary code. The presence of an 'Auto_Open' defined name further confirms that this macro will execute automatically when the workbook is opened. The macro sheet itself contains a large amount of seemingly random data, which may be obfuscated code or a payload. Without further deobfuscation or network analysis, the exact payload and delivery mechanism remain unclear, but the intent is to execute code.
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.txtd76ad12b39a0f4a23497d679b6bfefeee22ffd2af363c996a8f1bbd09d1b7fbd |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 6537 bytes |
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