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 containing an Auto_Open defined name, indicating it will execute macros automatically upon opening. Heuristics indicate the use of dangerous formula APIs, specifically the RUN function, which allows for arbitrary command execution. The presence of an Auto_Open entry strongly suggests the intent to execute a malicious 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) | 6466 bytes |
SHA-256: f1a11551d1b022ff3171f1f11cf1c247fc1596485f6f42b73bb9a0857bebb1b7 |
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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 - fIfNR ' 0018 23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d Sheet!D165 ' 0018 27 LABEL : Cell Value, String Constant - bfWJwuuRzXEj len=0 ' 0018 20 LABEL : Cell Value, String Constant - bnNsE len=0 ' 0018 27 LABEL : Cell Value, String Constant - chYHRgwyFvRv len=0 ' 0018 24 LABEL : Cell Value, String Constant - EChcXwppA len=0 ' 0018 26 LABEL : Cell Value, String Constant - EdlAQJRHQQh len=0 ' 0018 26 LABEL : Cell Value, String Constant - hhEiwGsfGMQ len=0 ' 0018 20 LABEL : Cell Value, String Constant - iVEPV len=0 ' 0018 23 LABEL : Cell Value, String Constant - KiEZKATK len=0 ' 0018 21 LABEL : Cell Value, String Constant - KsQmFE len=0 ' 0018 27 LABEL : Cell Value, String Constant - lIBBciAVKeLO len=0 ' 0018 21 LABEL : Cell Value, String Constant - LYRzUL len=0 ' 0018 20 LABEL : Cell Value, String Constant - mWObT len=0 ' 0018 25 LABEL : Cell Value, String Constant - nqzxBSGPRW len=0 ' 0018 23 LABEL : Cell Value, String Constant - OANdyJnm len=0 ' 0018 21 LABEL : Cell Value, String Constant - QYiGoM len=0 ' 0018 26 LABEL : Cell Value, String Constant - rbmkwSCJzDn len=0 ' 0018 27 LABEL : Cell Value, String Constant - SMuRxOOMZLSP len=0 ' 0018 25 LABEL : Cell Value, String Constant - WYrrRcNGFS len=0 ' 0018 24 LABEL : Cell Value, String Constant - ZBRXwXYye len=0 ' 0018 25 LABEL : Cell Value, String Constant - zsPIpZPvWF 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 ' 0 ... (truncated) |
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