MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1059.001 PowerShell
T1059.003 Windows Command Shell
The sample is an Excel file containing Excel 4.0 macros, specifically an Auto_Open macro. The critical heuristics indicate the presence of dangerous formula APIs, including the RUN function, which is commonly used to execute arbitrary commands. The macro sheet itself is heavily obfuscated, but the presence of the Auto_Open entry and the use of the RUN function strongly suggest the intent is to download and execute 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.txte8afc71fde888696ad17c8e1b896a0e028ffce2a1566878025de34bf53943f8c |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 8056 bytes |
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