MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 PowerShell
T1059.001 PowerShell
T1204.002 Malicious File
The sample is an Excel 4.0 macro-enabled spreadsheet that leverages the Auto_Open function to execute a series of PowerShell commands. These commands are designed to download a file named 'pd.bat' from the URL 'https://tinyurl.com/y6vlghvu' into the temporary directory, hide it, and then execute it. The macro's use of obfuscated PowerShell commands and the download of a secondary payload indicates a downloader functionality.
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.txt69215bd37e40a40e2b5298d876b617842c5387043e8cf2d2621efc6206865656 |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 1441 bytes |
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