MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
T1059.005 Visual Basic
The sample contains Excel 4.0 macros that are automatically executed upon opening. One macro reconstructs and executes a PowerShell command to download a file named 'pd.bat' from 'https://cutt.ly/kjadi5b' to the temporary directory. Subsequent macros manipulate this downloaded file, including setting its attributes to hidden and system, and then executing it. The use of Auto_Open and dangerous formula APIs like RUN indicates a malicious intent to download and execute a second-stage payload.
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.txt7ca4577b57e5fc1a4a6254e4685809d8f1b6c72171f1f1a3ebb3584b1108282f |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 1484 bytes |
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