MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1203 Exploitation for Client Execution
This Excel file contains Excel 4.0 (XLM) macros, specifically an Auto_Open defined name, which is a critical finding indicating automatic execution upon opening. The heuristics also flag the use of dangerous formula APIs within the XLM macro, suggesting it's designed to execute arbitrary commands. The macro sheet likely serves to download and execute a secondary payload, a common technique for initial execution.
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) | 6557 bytes |
SHA-256: 1a78a781fbc354df0d7d20bb815de2d268042bcb115ca736ab983fabd8dc64d1 |
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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 13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible - CokT ' 0018 20 LABEL : Cell Value, String Constant - AqipU len=0 ' 0018 23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d Sheet!I149 ' 0018 21 LABEL : Cell Value, String Constant - BthyTQ len=0 ' 0018 22 LABEL : Cell Value, String Constant - dppKdNh len=0 ' 0018 22 LABEL : Cell Value, String Constant - edEoIWq len=0 ' 0018 20 LABEL : Cell Value, String Constant - eNOKg len=0 ' 0018 26 LABEL : Cell Value, String Constant - ITDeieIjjYL len=0 ' 0018 24 LABEL : Cell Value, String Constant - IxkaVhwUx len=0 ' 0018 26 LABEL : Cell Value, String Constant - jquMzitnUwB len=0 ' 0018 27 LABEL : Cell Value, String Constant - OUUwybTsRCIX len=0 ' 0018 25 LABEL : Cell Value, String Constant - PDHkrbRDrH len=0 ' 0018 23 LABEL : Cell Value, String Constant - QlZGjeaQ len=0 ' 0018 21 LABEL : Cell Value, String Constant - QpfkzI len=0 ' 0018 20 LABEL : Cell Value, String Constant - RxhHF len=0 ' 0018 23 LABEL : Cell Value, String Constant - SwIzsxdu len=0 ' 0018 22 LABEL : Cell Value, String Constant - TjAddRn len=0 ' 0018 22 LABEL : Cell Value, String Constant - tWfxBLj len=0 ' 0018 25 LABEL : Cell Value, String Constant - UzohYGjwvo len=0 ' 0018 25 LABEL : Cell Value, String Constant - xSdwAdBNSh len=0 ' 0018 22 LABEL : Cell Value, String Constant - yHYRxRj len=0 ' 0018 26 LABEL : Cell Value, String Constant - ZsfiBQwKshL 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 LABELS ... (truncated) |
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