MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1204.002 Malicious File
The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open macro, which is a critical indicator of malicious intent. The macro utilizes dangerous formula APIs, including the RUN function, to execute arbitrary commands. The obfuscated document body and the presence of an Auto_Open macro strongly suggest that this file is designed to download and execute a second-stage payload from the reconstructed URL: http://os.mediarncbx.com/DGVCqBLjyrbJMgJNbl. The use of XLM macros points to a downloader or initial access mechanism.
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.txt8802d9ccc31363571bb5c72a8cabde8ec36203c7b23b87b6e58cac1a5b57e4b5 |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 38817 bytes |
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