MALICIOUS
200
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Service Execution: Visual Basic
T1059.001 Command and Scripting Interpreter: PowerShell
T1204.002 Malicious File Execution: User Execution of Malicious File
The file contains Excel 4.0 macros with an Auto_Open function, a known technique for executing malicious code. The macros construct a URL from concatenated strings, which is then likely used to download and execute a second-stage payload. The ClamAV detection explicitly names Emotet, and the heuristic firings strongly indicate a downloader functionality.
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.Downloader.Emotet-adc2d23d2dc26dd0-9950240-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Xls.Downloader.Emotet-adc2d23d2dc26dd0-9950240-0
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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.txteee0a3dec225fd0088c74c7ab34b064dd06b0d4f7198f4d9a113e7b902ce722a |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 6706 bytes |
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