MALICIOUS
240
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1059.001 PowerShell
T1204.002 Malicious File
The file is identified as malicious by ClamAV and exhibits critical heuristic firings indicating the presence of Excel 4.0 macros with an Auto_Open function. This function is configured to execute the 'RUN' command, which is highly suspicious and indicative of a downloader or initial execution stage. The macro likely attempts to write to the registry key HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy to establish persistence, and execute a payload named 'winupdsv.exe'.
Heuristics 5
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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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ClamAV: Xls.Trojan.Netsnak-1 critical CLAMAV_DETECTIONClamAV detected this file as malware: Xls.Trojan.Netsnak-1
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Reference to Windows Script Host high SC_STR_WSCRIPTReference to Windows Script Host
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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.txte9bac86970ab06ed9106fb2e9a0b73d5f8aa2668777221214edfa374f3c8b5cc |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 40267 bytes |
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