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 (XLM) macros. Heuristics indicate the presence of an Auto_Open macro and the use of dangerous formula APIs, specifically the RUN function. This suggests the macro is intended to execute a payload automatically when the workbook is opened. No specific URLs or further execution details were extracted, hence the family is unknown.
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) | 6619 bytes |
SHA-256: 7a2fb46c51c4a370026e875239d4220e94eb4f3a597bde77cf4b91db41a11363 |
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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 15 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible - oNySdF ' 0018 23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d Sheet!A145 ' 0018 22 LABEL : Cell Value, String Constant - BVkYWKD len=0 ' 0018 26 LABEL : Cell Value, String Constant - dWAYKQFxPCq len=0 ' 0018 27 LABEL : Cell Value, String Constant - efrVKSpAOVZV len=0 ' 0018 24 LABEL : Cell Value, String Constant - eOmrXpUaA len=0 ' 0018 22 LABEL : Cell Value, String Constant - exldoCn len=0 ' 0018 21 LABEL : Cell Value, String Constant - FnCTFw len=0 ' 0018 20 LABEL : Cell Value, String Constant - guJmG len=0 ' 0018 21 LABEL : Cell Value, String Constant - llmygQ len=0 ' 0018 25 LABEL : Cell Value, String Constant - miRbVYnHQI len=0 ' 0018 25 LABEL : Cell Value, String Constant - nsuisLFYPD len=0 ' 0018 25 LABEL : Cell Value, String Constant - ObtYhRMZmd len=0 ' 0018 27 LABEL : Cell Value, String Constant - oxhFxoWXKPXq len=0 ' 0018 20 LABEL : Cell Value, String Constant - PjBbq len=0 ' 0018 20 LABEL : Cell Value, String Constant - PyIIp len=0 ' 0018 22 LABEL : Cell Value, String Constant - rNOkaIA len=0 ' 0018 22 LABEL : Cell Value, String Constant - sGHrvRC len=0 ' 0018 20 LABEL : Cell Value, String Constant - tjIbH len=0 ' 0018 21 LABEL : Cell Value, String Constant - xUDzna len=0 ' 0018 27 LABEL : Cell Value, String Constant - yVxxXWGcgoxb len=0 ' 0018 20 LABEL : Cell Value, String Constant - ZJqjX 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 ' 00fd 10 LABELSST ... (truncated) |
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