MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1203 Exploitation for Client Execution
The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, specifically using dangerous formula APIs like RUN. This strongly suggests the macro is designed to execute arbitrary code upon opening the workbook. The presence of a macro sheet named 'jpAp' and the Auto_Open label further confirm this. The macro likely acts as a downloader for a second-stage payload, although no specific URLs or hashes were extracted from this file.
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) | 6408 bytes |
SHA-256: 443b2c8f23f82b4b22a06eec7b8ebca82c34a3a74cd06d213b8463f8e9445ca9 |
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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 - jpAp ' 0018 20 LABEL : Cell Value, String Constant - ATkGI len=0 ' 0018 23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d Sheet!H190 ' 0018 21 LABEL : Cell Value, String Constant - bzaCpw len=0 ' 0018 27 LABEL : Cell Value, String Constant - CAKrjiFbccCB len=0 ' 0018 21 LABEL : Cell Value, String Constant - cdZRaR len=0 ' 0018 24 LABEL : Cell Value, String Constant - cFFatZrkk len=0 ' 0018 25 LABEL : Cell Value, String Constant - hjQmPypAnE len=0 ' 0018 21 LABEL : Cell Value, String Constant - HLSRll len=0 ' 0018 27 LABEL : Cell Value, String Constant - INjMfObQHQhl len=0 ' 0018 21 LABEL : Cell Value, String Constant - lZCTku len=0 ' 0018 26 LABEL : Cell Value, String Constant - MzXOSfBAgie len=0 ' 0018 25 LABEL : Cell Value, String Constant - orZgzvszcb len=0 ' 0018 21 LABEL : Cell Value, String Constant - phcKpo len=0 ' 0018 25 LABEL : Cell Value, String Constant - QqzwsbeaZH len=0 ' 0018 24 LABEL : Cell Value, String Constant - RQTqNKufo len=0 ' 0018 22 LABEL : Cell Value, String Constant - SHVpCKa len=0 ' 0018 25 LABEL : Cell Value, String Constant - SlfSNkxVlp len=0 ' 0018 24 LABEL : Cell Value, String Constant - ufsboMRXc len=0 ' 0018 24 LABEL : Cell Value, String Constant - vamJnNRoC len=0 ' 0018 22 LABEL : Cell Value, String Constant - WOrbrCR len=0 ' 0018 24 LABEL : Cell Value, String Constant - xickWXBBU 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 ... (truncated) |
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