MALICIOUS
240
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1204.002 Malicious File
T1059.001 PowerShell
T1059.003 Windows Command Shell
This Excel 4.0 macro-enabled spreadsheet contains an Auto_Open macro, which is a critical indicator of malicious intent. The macro utilizes dangerous functions such as RUN and ShellExecute, and references URLDownloadToFile, suggesting it is designed to download and execute a secondary payload. The presence of these functions and the auto-execution mechanism strongly indicate a malicious downloader.
Heuristics 5
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Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOADReference to URLDownloadToFile API
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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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Reference to ShellExecute API high SC_STR_SHELLEXECReference to ShellExecute API
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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.txtd6dbae05077b2289201ee506285dd349bdf66d41221a8bb1f32b36acd5f6a33c |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 24373 bytes |
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