MALICIOUS
280
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1566.001 Spearphishing Attachment
T1203 Exploitation for Client Execution
The file contains Excel 4.0 macros, specifically an Auto_Open function, which is a critical finding indicating malicious intent. The presence of environment evasion and a lure to enable macros further supports this. ClamAV detection confirms this is a known dropper agent.
Heuristics 6
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ClamAV: Xls.Dropper.Agent-9156848-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Xls.Dropper.Agent-9156848-0
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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) | 73707 bytes |
SHA-256: 6e41c6a8ef07fd6a60281210f4b707c00c2460edca5ede9ad281c7e2fcb2a9bb |
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Preview scriptFirst 1,000 lines of the extracted script
' 0085 10 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible - o ' 0085 14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet ' 0085 26 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - LHuQGwLVEEqdEanCi ' 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 14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - Sheet ' 0018 31 LABEL : Cell Value, String Constant - ajHCfhOUnvlRMMLQ len=0 ' 0018 53 LABEL : Cell Value, String Constant - aKUaWizBWXgElPeLRksiOJKINxqxcDoFILDcFj len=0 ' 0018 23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d o!DU53916 ' 0018 41 LABEL : Cell Value, String Constant - bhBJxdZZYcOUcsTSiYbTrVzxfU len=0 ' 0018 59 LABEL : Cell Value, String Constant - bIlBhoHPFkfgejVOVyaLbfiZybHqmbvlcqBjjWJjGThP len=0 ' 0018 38 LABEL : Cell Value, String Constant - BIPfGGVLOGeImkSHbSJWgQP len=0 ' 0018 46 LABEL : Cell Value, String Constant - BKFixRkEynTcdbgRLSvJIYcfWvLDnVX len=0 ' 0018 23 LABEL : Cell Value, String Constant - BsRgZJrt len=0 ' 0018 58 LABEL : Cell Value, String Constant - BuNKhDbTQbsHcQZxrVXEYdlbHQQPUqxFjwvMPSKixqa len=0 ' 0018 37 LABEL : Cell Value, String Constant - BuNKhDbUQbsHcQaxsWXEYd len=0 ' 0018 46 LABEL : Cell Value, String Constant - bVnXtdntpCThpqzXSvxekEMChcdbgRY len=0 ' 0018 21 LABEL : Cell Value, String Constant - CbCNHZ len=0 ' 0018 20 LABEL : Cell Value, String Constant - CDNWR len=0 ' 0018 24 LABEL : Cell Value, String Constant - CdxcBSsTe len=0 ' 0018 18 LABEL : Cell Value, String Constant - CFZ len=0 ' 0018 37 LABEL : Cell Value, String Constant - CGUQzNmmOWiLeKhzZzLFXH len=0 ' 0018 21 LABEL : Cell Value, String Constant - COefBD len=0 ' 0018 55 LABEL : Cell Value, String Constant - CriwHppcdENZCVzYqCqnhzwUEOUQcstPRaxfIYFL len=0 ' 0018 61 LABEL : Cell Value, String Constant - CRmnxHCfuOhBvkQZaYdOIPsGFVZbTsIzkSUpSWkuPdQDdz len=0 ' 0018 22 LABEL : Cell Value, String Constant - CrXSSRW len=0 ' 0018 20 LABEL : Cell Value, String Constant - DBGqj len=0 ' 0018 64 LABEL : Cell Value, String Constant - dbJxSIyNXGGssUcpRlQoGSHExQNjTekgrJKfhqOuYoVbuDrXT len=0 ' 0018 37 LABEL : Cell Value, String Constant - DDemybuaxQcQOIaXtdotpC len=0 ' 0018 62 LABEL : Cell Value, String Constant - DENXSvLdxRLBgpqoteXeJWVlorjJXQBikFhmzLfsgStQPqY len=0 ' 0018 38 LABEL : Cell Value, String Constant - DexdCTfTRLda ... (truncated) |
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