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, indicated by multiple critical heuristics including OLE_XLM_AUTOOPEN and OLE_XLM_DANGEROUS_FN. The presence of an Auto_Open entry suggests the macro will execute automatically upon opening the document. The heuristics also indicate environment evasion techniques and a lure to enable macros, pointing towards a malicious dropper. The specific dangerous API used in the macro is 'RUN', which is typically used to execute external commands or download payloads.
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) | 74820 bytes |
SHA-256: 740db7bcbc3b12072a1f05bb2491820fa3d0d2f097cf3061aa8b92af8be19f28 |
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Preview scriptFirst 1,000 lines of the extracted script
' 0085 10 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible - x ' 0085 21 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - lDosTHFyROkG ' 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 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 - Sheet3 ' 0085 15 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Sheet3 ' 0085 14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - Sheet ' 0018 23 LABEL : Cell Value, String Constant - aaZePIPt len=0 ' 0018 21 LABEL : Cell Value, String Constant - alrnyQ len=0 ' 0018 53 LABEL : Cell Value, String Constant - anCjBmqQFCvOLiEcieqtIdfoysWmFZsmcIRRQU len=0 ' 0018 17 LABEL : Cell Value, String Constant - at len=0 ' 0018 23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d x!IY50964 ' 0018 20 LABEL : Cell Value, String Constant - besOQ len=0 ' 0018 60 LABEL : Cell Value, String Constant - BGqxFVvuLBEvUxcaIwRIyMWFFssTcoRkQnGSGDwPMjTdj len=0 ' 0018 41 LABEL : Cell Value, String Constant - bkljoMSZERQgjmeDSLvdfzchur len=0 ' 0018 23 LABEL : Cell Value, String Constant - bQkbSfqZ len=0 ' 0018 29 LABEL : Cell Value, String Constant - bQkbSfqZYMxZvI len=0 ' 0018 59 LABEL : Cell Value, String Constant - BRxEXfUzvvtykdkPpbquxpOrWGCqLBrGQyylYzViwevh len=0 ' 0018 30 LABEL : Cell Value, String Constant - bTPbrHcQZwrVXEX len=0 ' 0018 57 LABEL : Cell Value, String Constant - BVxCQNvJiiKSeHaGevWvHBTDZJUaWhyNVWgEybdKQj len=0 ' 0018 26 LABEL : Cell Value, String Constant - BwJaoKxHeZD len=0 ' 0018 21 LABEL : Cell Value, String Con ... (truncated) |
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