MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1059.001 PowerShell
T1059.003 Windows Command Shell
The sample is an Excel document containing Excel 4.0 macros, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN heuristics. The Auto_Open macro is configured to execute a formula that likely concatenates strings to form a command or payload. The specific formula `FORMULA(A1&A2&A3&A4&A5&A6&A7&A8&A9&A10&A11&A12&A13&A14&A15&A16&A17&A18&A19&A20&A21&A22&A23&A24&A25&A26&A27&A28&A29&A30&A31&A32&A33&A34&A35&A36&A37&A38&A39&A40&A41,L1)` suggests a complex string construction, typical for obfuscated execution of malicious commands or URLs.
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.txt79a3781f548c17438c2938246a0f73e7d90be665775552e53056197dae9fa45f |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 23297 bytes |
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