MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1059.001 PowerShell
T1566.001 Spearphishing Attachment
T1027 Obfuscated Files or Information
The critical OLE_XLM_DANGEROUS_FN heuristic indicates the presence of dangerous Excel 4.0 macro functions, specifically the RUN function. The extracted macro script reveals an Auto_Open macro that constructs and executes a PowerShell command. This command uses a WebClient object to download a file named 'pd.bat' from the URL 'https://cutt.ly/8jmDPVb' into the environment's temporary directory and then executes it. The script also includes commands to hide and remove the downloaded batch file after execution.
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.txt7255e9e3d4aa7d986f992766e3e0e0d1db3a5b8df5c4e7549e7d60769f80974f |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 1550 bytes |
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