MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1203 Exploitation for Client Execution
The sample is an Excel file containing Excel 4.0 macros, indicated by the presence of an Auto_Open defined name and the use of dangerous formula APIs. The Auto_Open macro is designed to automatically execute code when the workbook is opened, which is a common technique for delivering malicious payloads. The specific dangerous function used is RUN, suggesting an attempt to execute arbitrary code.
Heuristics 3
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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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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.
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) | 6940 bytes |
SHA-256: 29e2ee4c9b35df2e7ad84d88c413c6e347b119abea31acf35c9515bac813145e |
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Preview scriptFirst 1,000 lines of the extracted script
' 0085 14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - Sheet ' 0085 18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible - dKwtpvsfz ' 0018 23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d Sheet!G189 ' 0018 25 LABEL : Cell Value, String Constant - cqTYThEKQu len=0 ' 0018 22 LABEL : Cell Value, String Constant - dUeXnFj len=0 ' 0018 25 LABEL : Cell Value, String Constant - FDewLeBRDE len=0 ' 0018 23 LABEL : Cell Value, String Constant - fOvkTdgz len=0 ' 0018 25 LABEL : Cell Value, String Constant - FykuBMfrTE len=0 ' 0018 25 LABEL : Cell Value, String Constant - GHqEdlYhgR len=0 ' 0018 27 LABEL : Cell Value, String Constant - ICUJsDTuNJdI len=0 ' 0018 20 LABEL : Cell Value, String Constant - JEbmS len=0 ' 0018 21 LABEL : Cell Value, String Constant - KjXvlu len=0 ' 0018 26 LABEL : Cell Value, String Constant - MHUkPqMieip len=0 ' 0018 23 LABEL : Cell Value, String Constant - MnTJTKSf len=0 ' 0018 27 LABEL : Cell Value, String Constant - MwxQYHBXeXhx len=0 ' 0018 21 LABEL : Cell Value, String Constant - pqXskc len=0 ' 0018 22 LABEL : Cell Value, String Constant - qvdpmah len=0 ' 0018 24 LABEL : Cell Value, String Constant - rHTgOEvRe len=0 ' 0018 25 LABEL : Cell Value, String Constant - RNIRPlLiql len=0 ' 0018 22 LABEL : Cell Value, String Constant - rpuNYbE len=0 ' 0018 27 LABEL : Cell Value, String Constant - XbzibMLNUuai len=0 ' 0018 20 LABEL : Cell Value, String Constant - xFsIO len=0 ' 0018 27 LABEL : Cell Value, String Constant - YQSRcZXDbGWv len=0 ' 002a 2 PRINTHEADERS : Print Row/Column Labels ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ' 00fd 10 LABELSST : Cell Value, String Constant/ SST ... (truncated) |
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