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, specifically an Auto_Open macro. This macro is designed to execute dangerous formula APIs, including the RUN function, which is highly indicative of an attempt to download and execute a secondary payload. The presence of the Auto_Open entry and the use of the RUN function strongly suggest a malicious intent to compromise the user's system.
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) | 6872 bytes |
SHA-256: 551cd9464b0638224fb32a22a3c41feee9141365a460976a421dc7da170ca9b1 |
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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 19 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible - cKClAoRHRB ' 0018 27 LABEL : Cell Value, String Constant - adNfjMWstths len=0 ' 0018 22 LABEL : Cell Value, String Constant - asMfNBV len=0 ' 0018 23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d Sheet!C165 ' 0018 22 LABEL : Cell Value, String Constant - dMftxDY len=0 ' 0018 22 LABEL : Cell Value, String Constant - GAryvqJ len=0 ' 0018 22 LABEL : Cell Value, String Constant - jAUicmp len=0 ' 0018 26 LABEL : Cell Value, String Constant - JFhKtBwvenW len=0 ' 0018 27 LABEL : Cell Value, String Constant - kCBzBbsLWkXz len=0 ' 0018 20 LABEL : Cell Value, String Constant - OOQSp len=0 ' 0018 27 LABEL : Cell Value, String Constant - pzaWuLvXfikI len=0 ' 0018 21 LABEL : Cell Value, String Constant - QDwvhi len=0 ' 0018 23 LABEL : Cell Value, String Constant - SBWhGEeU len=0 ' 0018 20 LABEL : Cell Value, String Constant - sNNVp len=0 ' 0018 21 LABEL : Cell Value, String Constant - SPAvpr len=0 ' 0018 26 LABEL : Cell Value, String Constant - UdAyTrCXwdN len=0 ' 0018 26 LABEL : Cell Value, String Constant - uJkzfpFKETM len=0 ' 0018 27 LABEL : Cell Value, String Constant - VvdGavgrlrRX len=0 ' 0018 26 LABEL : Cell Value, String Constant - vvsLUwQutfm len=0 ' 0018 25 LABEL : Cell Value, String Constant - wdsWldorUf len=0 ' 0018 27 LABEL : Cell Value, String Constant - WmOEbCeKElEr len=0 ' 0018 24 LABEL : Cell Value, String Constant - YTYXIBxDB 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/ ... (truncated) |
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