MALICIOUS
220
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1203 Exploitation for Client Execution
This Excel file contains Excel 4.0 macros, specifically an Auto_Open function, which is designed to execute automatically when the workbook is opened. The macros utilize dangerous formula APIs and include environment evasion techniques, indicating a malicious intent to bypass security measures and execute arbitrary code. The presence of a macro-enable lure further supports this malicious purpose.
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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XLM Auto_Open environment-evasion close gate critical OLE_XLM_ENVIRONMENT_EVASION_CLOSEExcel 4.0 macro sheet auto-executes environment checks with GET.WORKSPACE / GET.WINDOW, then shows a fake corruption/error message and closes the workbook when the host fails those checks. This is a malware sandbox-evasion pattern, even when the later payload stage is hidden behind obfuscated defined-name flow.
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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.txt |
xlm-macro | oletools.olevba.extract_all_macros (XLM macro listing) | 59447 bytes |
SHA-256: 41b8963c8e0dd97612fb3ecd652a2593bf43498686990b17a522fc6db22cad7e |
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Preview scriptFirst 1,000 lines of the extracted script
' 0085 9 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible - ' 0085 21 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - pFMOXupTVCIb ' 0085 14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet ' 0085 14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet ' 0085 14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet ' 0085 14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet ' 0085 14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet ' 0085 14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet ' 0085 14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet ' 0085 15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet1 ' 0085 15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet1 ' 0085 15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet1 ' 0085 15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet1 ' 0085 15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet1 ' 0085 15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet1 ' 0085 15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet1 ' 0085 15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet1 ' 0085 15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet1 ' 0085 15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet1 ' 0085 15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet2 ' 0085 15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet2 ' 0085 15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet2 ' 0085 15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet2 ' 0085 15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet2 ' 0085 14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - Sheet ' 0018 51 LABEL : Cell Value, String Constant - aHNgoeKFFEJtmtYykBEHyXBfPLzULCPZJIvh len=0 ' 0018 23 LABEL : Cell Value, String Constant - aILfIMaW len=0 ' 0018 21 LABEL : Cell Value, String Constant - aJIviJ len=0 ' 0018 23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d !BL47449 ' 0018 28 LABEL : Cell Value, String Constant - avxHeLoFlrLTI len=0 ' 0018 45 LABEL : Cell Value, String Constant - bcafQJQuWHXbdVuXCmhWqhYmwfeSEf len=0 ' 0018 24 LABEL : Cell Value, String Constant - BfQMzULCQ len=0 ' 0018 27 LABEL : Cell Value, String Constant - BHDOfgCENkRu len=0 ' 0018 20 LABEL : Cell Value, String Constant - BKKJO len=0 ' 0018 23 LABEL : Cell Value, String Constant - brvxpPrW len=0 ' 0018 51 LABEL : Cell Value, String Constant - BuNKgDbTPbsHcQZwrVXEYdlbHQQOTqxFjvvL len=0 ' 0018 22 LABEL : Cell Value, String Constant - BVMDQbK len=0 ' 0018 59 LABEL : Cell Value, String Constant - BvvuzkdkPpbruxpOrWGCqLCsGQzymYzWiwevhlMzxrKH len=0 ' 0018 47 LABEL : Cell Value, String Constant - BXHSXUfwLTUdCwZbIOhpfLGHFKuCJZBz len=0 ' 0018 49 LABEL : Cell Value, String Constant - BXtSKGSixTHQniMOuOUcRwGHFKhnvZmlCG len=0 ' 0018 23 LABEL : Cell Value, String Constant - ccafRXev len=0 ' 0018 23 LABEL : Cell Value, String Constant - CcnhzjGp len=0 ' 0018 59 LABEL : Cell Value, String Constant - CKyeaaZePVdtUTjZcUsWBygVpfWkuddQRltHiChGXjXV len=0 ' 0018 29 LABEL : Cell Value, String Constant - COcKbOSrfdXpmJ len=0 ' 0018 20 LABEL : Cell Value, String Constant - CppRZ len=0 ' 0018 32 LABEL : Cell Value, String Constant - dbgELSvJIYcfWvLDn len=0 ' 0018 23 LABEL : Cell Value, String Constant - dcsvyqPe len=0 ' 0018 45 LABEL : Cell Value, String Constant - DDdmybuaxQpQbVnWtdntpCShoqzXSv ... (truncated) |
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