MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 PowerShell
T1204.002 Malicious File
T1059.001 PowerShell
The sample contains Excel 4.0 macros, specifically an Auto_Open macro, which is a critical finding. The macro executes a PowerShell command that downloads a file from 'https://rb.gy/pzuh4v' and saves it as 'wd.exe' in the AppData directory. It then moves the downloaded file to the AppData directory and executes it. This indicates a downloader functionality, aiming to retrieve and run 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.txta1064e93e32e546f6b516fd57658f76cd10c80d3bb42ced88251fcbf463ba6c8 |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 1051 bytes |
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