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 XLS file containing Excel 4.0 (XLM) macros. Heuristics indicate the use of an Auto_Open macro and dangerous formula APIs (RUN), which is a common pattern for automated payload delivery. The document body contains a large amount of obfuscated or random-looking text, likely used to hide the actual malicious logic or as a filler to bypass detection. No scripts were extracted from the sample, but the presence of XLM macros with auto-execution triggers is highly indicative of a downloader pattern.
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.txtda383f4b9bb2eb6a7911b29beafc37d09d0cdd9f0c60fa36e64006a3bae1de5e |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 193609 bytes |
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