MALICIOUS
200
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 that execute automatically via an Auto_Open entry. Heuristics indicate the use of dangerous formula APIs (RUN=439), which are typically used to execute shell commands or download payloads. The document body contains a large amount of obfuscated, randomized string data that likely serves as a source for the macro to reconstruct a C2 URL or payload, though the specific URL is not explicitly reconstructed in the provided script excerpt.
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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ClamAV: Xls.Dropper.Agent-7865798-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Xls.Dropper.Agent-7865798-0
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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.txt7b678a45af0d88541100d2cbadb0395daf77729faaa675e836359cf74b18aa81 |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 50299 bytes |
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