MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Service Execution: Visual Basic
T1059.001 Command and Scripting Interpreter: PowerShell
T1059.003 Command and Scripting Interpreter: Windows Command Shell
The file contains Excel 4.0 (XLM) macro sheets, specifically triggering the Auto_Open defined name heuristic. This indicates the workbook is configured to automatically execute a macro upon opening. The presence of dangerous formula APIs like RUN further confirms the intent to execute arbitrary code. While the specific payload is not directly visible, the Auto_Open function is a common method for initial stage malware delivery, often downloading and executing 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.txt7dea3878d9e3a7777dc6b58cbb2175f457ea7caf58c129b05a8a317b72e3900a |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 6629 bytes |
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