MALICIOUS
160
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1204.002 Malicious File
The sample is an Excel file containing Excel 4.0 macros, specifically an Auto_Open macro. This macro utilizes the RUN function, which is a critical indicator of malicious intent as it can execute arbitrary commands. The presence of a macro-enable lure further supports the malicious nature of the file, aiming to trick users into enabling macros to initiate the execution chain. The macro sheet itself contains references to other cells, but the primary execution vector is the Auto_Open function calling RUN.
Heuristics 4
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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.
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Macro/content-enable lure medium SE_ENABLE_LUREDocument instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
xlm_macros.txt7f9759c0bfb1748c5389228aa8e4c71506861b27b97135c617636aec6a562703 |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 3555 bytes |
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