MALICIOUS
80
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic for Applications
The file is an Excel spreadsheet containing Excel 4.0 macros, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_AUTOOPEN_DEFINEDNAME heuristics. The macro sheet contains an Auto_Open entry, which is designed to execute automatically when the workbook is opened. The macro code itself is heavily obfuscated but appears to be constructing strings and executing commands, consistent with a downloader or initial execution stage. The presence of an Auto_Open macro sheet is a strong indicator of malicious intent, often used to bypass security controls or deliver further malware.
Heuristics 2
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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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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.txt9a5ff0a1f6d0f5000504af968466f1d45b29c53588b0fd79d8460ee3229e2e15 |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 17021 bytes |
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