MALICIOUS
202
Risk Score
Heuristics 5
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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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URL reconstructed from XLM cell array (2 URLs) critical OLE_XLM_CELL_ARRAY_URLExcel 4.0 macro sheet stages its payload URL across the BIFF8 Shared String Table (one quoted-char SST entry concatenated with & at runtime), across individual numeric cells (one ASCII charcode per cell), or split across multi-char fragment cells a download formula concatenates by reference (=A1&A2&… / CONCATENATE(...)). The reconstructed URL is invisible to literal-bytes URL extraction because it is never contiguous in the workbook stream. URLs were recovered by walking the BIFF8 record stream and decoding SST entries, LABELSST/RK/NUMBER cells, and FORMULA cell-reference concatenation in token order.
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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.
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Embedded URL info EMBEDDED_URLOne or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.URL http://engast.top/rt2 Referenced by macro
- http://lecmess.top/dat1Referenced by macro
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) | 1852 bytes |
SHA-256: c9b9d78dcd1a9fc6958870c174017989850ed71f5e020f73449a2ea278f33049 |
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Preview scriptFirst 1,000 lines of the extracted script
' 0085 9 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, hidden - ' 0085 13 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, hidden - Page ' 0085 11 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible - ' 0018 31 LABEL : Cell Value, String Constant - breakout1 len=7 ptgRef3d !E4 ' 0018 31 LABEL : Cell Value, String Constant - breakout2 len=7 ptgRef3d !F10 ' 0018 28 LABEL : Cell Value, String Constant - Labos1 len=7 ptgRef3d !E4 ' 0018 28 LABEL : Cell Value, String Constant - Labos2 len=7 ptgRef3d !F10 ' 0018 28 LABEL : Cell Value, String Constant - Macro1 len=7 ptgRef3d !E4 ' 0018 28 LABEL : Cell Value, String Constant - Macro2 len=7 ptgRef3d !F10 ' 0018 23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d !D2 ' 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 ' 002a 2 PRINTHEADERS : Print Row/Column Labels ' 002a 2 PRINTHEADERS : Print Row/Column Labels ' Sheet,Reference,Formula,Value ' ,D2,breakout1(),"" ' ,D3,HALT(),"" ' ,E5,breakout2(),"" ' ,E8,RETURN(),"" ' ,F11,IF(L2+M2>0),"" ' ,F13,"EXEC( !A32,2)","" ' ,F14,"MESSAGE(TRUE,"Done")","" ' ,F20,*STACKERROR* not enough arguments for function: ELSE,"" ' ,F21,PAUSE(),"" ' ,F23,*STACKERROR* not enough arguments for function: END.IF,"" ' ,F24,RETURN(),"" ' ,A33,HALT(),"" |
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