MALICIOUS
160
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic for Applications
T1204.002 Malicious File
T1059.001 PowerShell
The file contains Excel 4.0 macros, specifically an Auto_Open macro that utilizes the dangerous `REGISTER` and `EXEC` functions. The `REGISTER` function is used to call `URLD`, which likely downloads a payload from the reconstructed URL "http://writtendeer.com/cosmo/solomon.php". The `EXEC` function is then used to run the downloaded payload. The presence of a 'Macro/content-enable lure' heuristic further indicates that the document is designed to trick users into enabling macros to initiate the malicious execution chain.
Heuristics 4
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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.
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Macro/content-enable lure medium SE_ENABLE_LUREDocument instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
Extracted artifacts 1
Files carved from inside the sample during analysis.
| Filename | Kind | Source | Size |
|---|---|---|---|
xlm_macros.txtd2a1f933717de73425d1c8c42b15a2a39422596b28f0deddd18d06db73e15326 |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 2301 bytes |
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