MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1203 Exploitation for Client Execution
The file is an Excel 4.0 macro sheet that contains an Auto_Open defined name, indicating it will execute macros automatically upon opening. Heuristics indicate the use of dangerous formula APIs, suggesting the macro is designed to execute arbitrary code. The presence of the Auto_Open function and the use of dangerous APIs strongly suggest the intent is to download and execute a second-stage payload.
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) | 6607 bytes |
SHA-256: 6175bc186e18e3766216a57572b7c518d5c3235e160a52f98a5b86c5c1475f0f |
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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 14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible - HUysw ' 0018 23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d Sheet!I191 ' 0018 23 LABEL : Cell Value, String Constant - CGUQLvFy len=0 ' 0018 21 LABEL : Cell Value, String Constant - Cphsqe len=0 ' 0018 27 LABEL : Cell Value, String Constant - CxbfzZRJBRuu len=0 ' 0018 24 LABEL : Cell Value, String Constant - DbNlIHvgf len=0 ' 0018 25 LABEL : Cell Value, String Constant - eKjtnBAtxn len=0 ' 0018 21 LABEL : Cell Value, String Constant - gMNcWd len=0 ' 0018 20 LABEL : Cell Value, String Constant - hDZMy len=0 ' 0018 21 LABEL : Cell Value, String Constant - HgVUFm len=0 ' 0018 22 LABEL : Cell Value, String Constant - KFNiClS len=0 ' 0018 22 LABEL : Cell Value, String Constant - MomirlH len=0 ' 0018 26 LABEL : Cell Value, String Constant - mTzAvvvPTUQ len=0 ' 0018 20 LABEL : Cell Value, String Constant - okuvN len=0 ' 0018 20 LABEL : Cell Value, String Constant - RMrPw len=0 ' 0018 22 LABEL : Cell Value, String Constant - ROquOlV len=0 ' 0018 25 LABEL : Cell Value, String Constant - tyZjgiZlfr len=0 ' 0018 26 LABEL : Cell Value, String Constant - UhkTUoPZJDw len=0 ' 0018 26 LABEL : Cell Value, String Constant - viygmZSTrKp len=0 ' 0018 20 LABEL : Cell Value, String Constant - VQGpG len=0 ' 0018 25 LABEL : Cell Value, String Constant - yUKnQIOkNM len=0 ' 0018 21 LABEL : Cell Value, String Constant - zFEMeJ 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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