MALICIOUS
280
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1203 Exploitation for Client Execution
The file contains Excel 4.0 macros with an Auto_Open entry, a critical finding indicating potential malicious execution. Heuristics also point to dangerous formula APIs and environment evasion, consistent with a dropper. ClamAV detection further supports this, identifying it as Xls.Dropper.Agent. The presence of an Auto_Open macro suggests the intent is to automatically execute a secondary payload upon opening the document.
Heuristics 6
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ClamAV: Xls.Dropper.Agent-8840636-0 critical CLAMAV_DETECTIONClamAV detected this file as malware: Xls.Dropper.Agent-8840636-0
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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) | 77562 bytes |
SHA-256: 4a90fe833583921de4d17e3f7733bb5755a85de21884c9499bf0fc2a4ce885ac |
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Preview scriptFirst 1,000 lines of the extracted script
' 0085 10 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible - v ' 0085 17 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - wRvUlxmj ' 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 15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet2 ' 0085 14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - Sheet ' 0018 22 LABEL : Cell Value, String Constant - aHkBhnH len=0 ' 0018 64 LABEL : Cell Value, String Constant - aHPQOTExFivuLPSJixqaIKfIMakFTGsTpoRxQCGfGRLdawTrj len=0 ' 0018 64 LABEL : Cell Value, String Constant - aoyhhUUvERsMrQhtifZroLuGMITklHISpWzQvDWeTyuusxjcj len=0 ' 0018 23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d v!DZ20620 ' 0018 21 LABEL : Cell Value, String Constant - aXtPot len=0 ' 0018 22 LABEL : Cell Value, String Constant - azPHrZb len=0 ' 0018 24 LABEL : Cell Value, String Constant - bMtvQsxMW len=0 ' 0018 17 LABEL : Cell Value, String Constant - BN len=0 ' 0018 25 LABEL : Cell Value, String Constant - BPZtIuhIed len=0 ' 0018 31 LABEL : Cell Value, String Constant - bXjBPXYhFzdfMSlt len=0 ' 0018 21 LABEL : Cell Value, String Constant - cCeKHp len=0 ' 0018 49 LABEL : Cell Value, String Constant - cCRJtbdybftEYmZMmJIkRiVZyZkewtQmLD len=0 ' 0018 21 LABEL : Cell Value, String Constant - Cdcsil len=0 ' 0018 43 LABEL : Cell Value, String Constant - cdyzKhOrHnuNVLqlmkpaUbFgRhlo len=0 ' 0018 32 LABEL : Cell Value, String Constant - CjlGinBMgthTuRQrZ len=0 ' 0018 60 LABEL : Cell Value, String Constant - ClhWqgXlveeREeBOcKbNRqfcWolIeDJFQUiEGPYTwNfzT len=0 ' 0018 38 LABEL : Cell Value, String Constant - coRkQoGSGExQNjTekgrJKfg len=0 ' 0018 23 LABEL : Cell Value, String Constant - CPOeikcC len=0 ' 0018 53 LABEL : Cell Value, String Constant - cpoFILDbqjTBEYBFTdyMylNjhKrJuyZyKEWTqM len=0 ' 0018 52 LABEL : Cell Value, String Constant - CQaJJviJfsHoGrvVKHBTQmJhnjuyNiktDxbrK len=0 ' 0018 50 LABEL : Cell Value, String Constant - CsShaKruPrvKGoDccDMYBUzXpPpBuNwTDNT len=0 ' 0018 ... (truncated) |
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