MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1203 Exploitation for Client Execution
The file is an Excel document containing Excel 4.0 macros, specifically an Auto_Open macro. This macro is flagged as dangerous due to its use of formula APIs, including the RUN function, indicating it's designed to execute arbitrary commands. The presence of the Auto_Open entry strongly suggests the macro will execute automatically when the workbook is opened, likely to download and execute a secondary 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) | 6413 bytes |
SHA-256: b1c00c461095aeeeea0b4e03d83ab5b51040e1ce6cbec0a3db26f6971cb42732 |
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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 - KjszZ ' 0018 25 LABEL : Cell Value, String Constant - ajvPDHFQYf len=0 ' 0018 23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d Sheet!F182 ' 0018 23 LABEL : Cell Value, String Constant - AWjdAbBf len=0 ' 0018 23 LABEL : Cell Value, String Constant - BfOeEwIO len=0 ' 0018 20 LABEL : Cell Value, String Constant - bwohe len=0 ' 0018 21 LABEL : Cell Value, String Constant - CjZCEk len=0 ' 0018 21 LABEL : Cell Value, String Constant - JmXBlQ len=0 ' 0018 27 LABEL : Cell Value, String Constant - mUReaRrfgKXJ len=0 ' 0018 25 LABEL : Cell Value, String Constant - NadFQAXHfD len=0 ' 0018 21 LABEL : Cell Value, String Constant - nCWKxo len=0 ' 0018 27 LABEL : Cell Value, String Constant - pEJRwMiBlbLy len=0 ' 0018 20 LABEL : Cell Value, String Constant - rdMBh len=0 ' 0018 20 LABEL : Cell Value, String Constant - rNaEx len=0 ' 0018 21 LABEL : Cell Value, String Constant - ryeaWK len=0 ' 0018 21 LABEL : Cell Value, String Constant - sBVoqY len=0 ' 0018 27 LABEL : Cell Value, String Constant - vKqVfEvJahTO len=0 ' 0018 22 LABEL : Cell Value, String Constant - vmDjhWA len=0 ' 0018 24 LABEL : Cell Value, String Constant - XDupBfHut len=0 ' 0018 21 LABEL : Cell Value, String Constant - YFDeQa len=0 ' 0018 21 LABEL : Cell Value, String Constant - ZeJvMi len=0 ' 0018 23 LABEL : Cell Value, String Constant - ZignBWMZ 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 : Cel ... (truncated) |
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