MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Service Execution: Service Execution
T1059.001 PowerShell: PowerShell
The critical heuristics OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN indicate the presence of Excel 4.0 macros designed to auto-execute. The macro uses the RUN function, which is a dangerous API that can execute arbitrary commands. The extracted document body contains paths that may be used by the macro to locate or stage malicious files. The macro's intent is to execute commands, likely for downloading and running a second-stage payload.
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.txt34659f34746a4e3bf956186553ce7fb67884fdec7714f40c612cba3149a21b98 |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 38141 bytes |
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