MALICIOUS
200
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1204.002 Malicious File
This Excel 4.0 macro-enabled document contains an Auto_Open macro, which is a critical indicator of malicious intent. The macro utilizes dangerous formula APIs, specifically the RUN function, to execute arbitrary code. ClamAV signature 'Xls.Dropper.Agent-8508438-0' further confirms its malicious nature. The macro's primary function appears to be downloading and executing a second-stage payload, as indicated by the use of the RUN function and the presence of a large, obfuscated macro script.
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-8508438-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Xls.Dropper.Agent-8508438-0
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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.txt30e693aff9850e5406ab12f6e3550e2f528f8979a4be19634fb798626c3a0a32 |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 129920 bytes |
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