MALICIOUS
220
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1566.001 Spearphishing Attachment
The sample is an Excel file containing Excel 4.0 macros, specifically an Auto_Open macro. Heuristics indicate the macro attempts environment evasion and uses dangerous formula APIs, suggesting it's designed to execute malicious code. The presence of an Auto_Open macro and the 'Macro/content-enable lure' heuristic strongly suggest this file was intended to be delivered as a malicious attachment via spearphishing.
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) | 68814 bytes |
SHA-256: 10711d63462098d9c484b804d8ab3d965bafccc96f81469105845ead3de17aa2 |
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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 17 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - jyprjJlQ ' 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 14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - Sheet ' 0018 23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d !BV5730 ' 0018 23 LABEL : Cell Value, String Constant - aWLfVMak len=0 ' 0018 17 LABEL : Cell Value, String Constant - aX len=0 ' 0018 22 LABEL : Cell Value, String Constant - axhrxtG len=0 ' 0018 38 LABEL : Cell Value, String Constant - bgdoGHcdmLrVkRXqyoUPQOT len=0 ' 0018 41 LABEL : Cell Value, String Constant - BgEWiWUOgdzjuzwIZavwGeLoEk len=0 ' 0018 44 LABEL : Cell Value, String Constant - BHPfGFVLOGeImkSHbRIWgPPCDdmyb len=0 ' 0018 22 LABEL : Cell Value, String Constant - bIOhpfL len=0 ' 0018 48 LABEL : Cell Value, String Constant - biyZYoehZxbGElaulbpziiVWwGSuOsRjv len=0 ' 0018 55 LABEL : Cell Value, String Constant - BLRNZpFMOXupTVCIbjZFzzyEovDTttJyCtSvaYGu len=0 ' 0018 42 LABEL : Cell Value, String Constant - bQkbSfpYYMMmvIkEjHZlZWQifDm len=0 ' 0018 31 LABEL : Cell Value, String Constant - BsRuZXFtOFvJTDCp len=0 ' 0018 50 LABEL : Cell Value, String Constant - bUbGTSilogGUNxfhCejwIcpdPqNMnVmYcDd len=0 ' 0018 23 LABEL : Cell Value, String Constant - bVnkHdCt len=0 ' 0018 22 LABEL : Cell Value, String Constant - BWJTqlP len=0 ' 0018 39 LABEL : Cell Value, String Constant - bWnlIdCuqCThEqBYTwxeyEMC len=0 ' 0018 51 LABEL : Cell Value, String Constant - CcbrhkcBeJHodxnesDllYYzIVwRvUlxmjdvs len=0 ' 0018 35 LABEL : Cell Value, String Constant - cDZYBhzlpPpBuNKgDbTP len=0 ' 0018 23 LABEL : Cell Value, String Constant - CGIzZogR len=0 ' 0018 19 LABEL : Cell Value, String Constant - chFM len=0 ' 0018 22 LABEL : Cell Value, String Constant - ChFXjXU len=0 ' 0018 28 LABEL : Cell Value, String Constant - CosSGExQNjGek len=0 ' 0018 17 LABEL : Cell Value, String Constant - Cr len=0 ' 0018 33 LABEL : Cell Value, String Constant - csZfyHvbXXWaMFMqRD len=0 ' 0018 32 LABEL : Cell Value, String Constant - DDemybuayQcQOIaXt len=0 ' 0018 60 LABEL : Cell Value, String Constant - dHIovOWMrmnlqbipGhgwmpgGiOLthDsjxIqqddFNaCVBZ len=0 ' 0018 39 LABEL : Cell Value, String Constant - dKSTRWHBIlyxOSVMlBtdLNiL len=0 ' 0018 50 LABEL : Cell Value, String Constant - DLBgppotQXeJWVlorjIXQzikFhmzwfsSStC len=0 ' 0018 63 LABEL : Cell Value, String Constant - dotqCTUpqzYFixekEMChcdbgRKSvXIYceWvYDnjXsiZnxggT len=0 ' 0018 20 LABEL : Cell Value, String Constant - DpRnl len=0 ' 0018 48 LABEL : Cell Value, String Constant - DSZbkIDgiPVowlSNNMRCJQgHGWMPHfJnl len=0 ' 0018 21 LABEL : Cell Value, String Constant - DTtsJy len=0 ' 0018 24 LABEL : Cell Value, String Constant - ECHrkrWwi len=0 ' 0018 50 LABEL : Cell Value, String Constant - EILCbqjTBEYBFTdyMylMihKrJuyYyKEWTpM len=0 ' 0018 17 LABEL : Cell Value, String Constant - eJ len=0 ' 0018 21 LABEL : Cell Value, String Constant - ElnIkp len=0 ' 0018 18 LABEL : Cell Value, String Constant - Eov len=0 ' 0018 50 LABEL : Cell Value, String Constant - esfSsPOqXpbfFfqkDzWsRJFRhwSGPmhLNtO len=0 ' 0018 25 LABEL : Cell Value, String Constant - EwEiJuLPRJ len=0 ' 0018 24 LABEL : Cell Value, String Constant - FfqkDlIrD len=0 ' 0018 31 LABEL : Cell Value, S ... (truncated) |
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