MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1059.001 PowerShell
T1566.001 Spearphishing Attachment
The file is an Excel spreadsheet containing Excel 4.0 macros, specifically an Auto_Open macro. This macro is designed to execute automatically when the workbook is opened. The critical heuristics indicate the presence of dangerous formula APIs within the XLM macro, including the 'RUN' function, which is commonly used to execute arbitrary commands or download and run malicious payloads. The presence of an Auto_Open entry strongly suggests an attempt to deliver a secondary payload upon opening the malicious document.
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.txt14ff9b09c3abf0b63b714181cfae1cda6e16f1c26555af3302e29c8b50e790d2 |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 6661 bytes |
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