MALICIOUS
240
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1204.002 Malicious File
T1059.001 PowerShell
T1059.003 Windows Command Shell
This Excel 4.0 macro-enabled document contains an Auto_Open macro, indicated by the OLE_XLM_AUTOOPEN and OLE_XLM_AUTOOPEN_DEFINEDNAME heuristics. The macro utilizes dangerous functions, including ShellExecute and URLDownloadToFile, as flagged by SC_STR_SHELLEXEC and SC_STR_URLDOWNLOAD. This suggests the macro is designed to download and execute a secondary payload from a remote location. The document body contains obfuscated text, which is typical for macro-based lures.
Heuristics 5
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Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOADReference to URLDownloadToFile API
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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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Reference to ShellExecute API high SC_STR_SHELLEXECReference to ShellExecute API
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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.txt484fd313fdb8640fc25492c455bbab61ae4ca3544e15eed67c557749a98dd34a |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 47300 bytes |
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