MALICIOUS
140
Risk Score
Malware Insights
MITRE ATT&CK
T1059.005 Visual Basic
T1203 Exploitation for Client Execution
The file contains Excel 4.0 macros, specifically an Auto_Open entry, which is a critical finding. This indicates the macro sheet is designed to execute automatically when the workbook is opened. The presence of dangerous formula APIs like RUN suggests the macro is intended to execute arbitrary code, likely a downloader for a second-stage payload. No specific URLs or hashes were extracted, limiting further IOC identification.
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) | 6447 bytes |
SHA-256: 022b5dbb0d2c17b357a760dc498e5b7737e2d36bdf9136d0b0acaf54e160796c |
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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 - KCosc ' 0018 23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d Sheet!A188 ' 0018 25 LABEL : Cell Value, String Constant - ezZksLRekh len=0 ' 0018 21 LABEL : Cell Value, String Constant - gaCzHE len=0 ' 0018 24 LABEL : Cell Value, String Constant - gQVfwkJDn len=0 ' 0018 22 LABEL : Cell Value, String Constant - IGKMstC len=0 ' 0018 23 LABEL : Cell Value, String Constant - ILKLfMss len=0 ' 0018 24 LABEL : Cell Value, String Constant - MOBdRsffp len=0 ' 0018 26 LABEL : Cell Value, String Constant - MwxMLjSrfSp len=0 ' 0018 20 LABEL : Cell Value, String Constant - NKpMz len=0 ' 0018 23 LABEL : Cell Value, String Constant - NwmbCKqk len=0 ' 0018 22 LABEL : Cell Value, String Constant - OnyvGbD len=0 ' 0018 21 LABEL : Cell Value, String Constant - pCznXM len=0 ' 0018 25 LABEL : Cell Value, String Constant - PeKlQrdKUK len=0 ' 0018 26 LABEL : Cell Value, String Constant - PJGafFyfATC len=0 ' 0018 20 LABEL : Cell Value, String Constant - SIPMO len=0 ' 0018 26 LABEL : Cell Value, String Constant - sMrBsgvOwdn len=0 ' 0018 24 LABEL : Cell Value, String Constant - UBNTVQRwf len=0 ' 0018 25 LABEL : Cell Value, String Constant - uvhdgUyzlq len=0 ' 0018 25 LABEL : Cell Value, String Constant - VguvWSTjXL len=0 ' 0018 25 LABEL : Cell Value, String Constant - vXhQNvEWCh len=0 ' 0018 20 LABEL : Cell Value, String Constant - YnlKa 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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