MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic for Applications
T1204.002 User Execution: Malicious File
T1105 Ingress Tool Transfer
The sample is an Excel workbook containing Excel 4.0 (XLM) macros designed for auto-execution via an Auto_Open entry. Heuristics indicate the use of dangerous formula APIs (RUN=434), which are typically used to execute arbitrary system commands or download payloads. While the document body contains a large amount of obfuscated or randomized text, no clear second-stage URL was reconstructed from the truncated script excerpts provided.
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.txt605f278b37c0df79aac4f33175d8fff8f397835bba98ac1b45e4e41e5b28cdfe |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 74673 bytes |
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